Complete Phase 3B authoritative playback

Audit, fix, and verify the Phase 3B playback engine under Node 22 with a
full backend suite, project lint/build checks, Docker builds, Compose
validation, and isolated runtime playback verification.

Two concrete correctness bugs were found and fixed, each with a
regression test that fails without the fix:

reconcileRotating() evaluated boundaries against a stale entry. After
fastForwardStable() skipped whole cycles it could move the stable cursor,
but the loop kept using the pre-skip entry, so that entry's schedule end
or expiration cut the successor's slide short and shifted every later
absolute deadline. Re-evaluate the loop when the cursor moves.

resumeHeldEntry() could reconstruct a timeline whose slide_started_at was
in the future. A remainder captured under a longer duration was replayed
verbatim after the effective duration shrank, publishing a snapshot whose
current slide had not started yet and whose remaining time exceeded its
own effective duration. Clamp the remainder to the effective duration.

Two Phase 3A tests built playback_state rows by raw SQL that the service
can never hold: an activation queued behind a playlist with no playable
entry, and a static hold that still carried a live absolute timeline.
Both now drive the authoritative service, keeping their original
assertions about deletion protection and revision bookkeeping.

Record the static-target deletion refusal as a known interim integration
point rather than final behavior; playback already tolerates a deleted
static asset, so Phase 3B does not depend on it.

Co-Authored-By: Claude Opus 5 <[email protected]>

.dockerignore

@@ -0,0 +1,18 @@
+.git
+.gitignore
+.agents
+.codex
+.env
+.env.*
+!.env.example
+**/node_modules
+.pnpm-store
+**/dist
+**/*.log
+**/*.sqlite
+**/*.sqlite-shm
+**/*.sqlite-wal
+**/*.sqlite-journal
+data
+backups
+client/pnpm-lock.yaml

.env.example

@@ -0,0 +1,46 @@
+# A distinct project name and host port let v1 and v2 run side by side.
+COMPOSE_PROJECT_NAME=announcements-v2
+WEB_PORT=5175
+
+# Docker Compose pins these internal values. They are shown here to document the
+# standalone API configuration contract; do not uncomment them for normal Compose use.
+# NODE_ENV=production
+# HOST=0.0.0.0
+# PORT=7532
+# DATABASE_PATH=/data/db/announcements.sqlite
+# S3_ENDPOINT=http://seaweedfs:8333
+# S3_FORCE_PATH_STYLE=true
+
+# Optional local Vite development proxy target (not used by Compose).
+# VITE_API_PROXY_TARGET=http://127.0.0.1:7532
+
+# Application configuration exposed by Compose
+APP_TIMEZONE=America/Chicago
+SHUTDOWN_TIMEOUT_MS=10000
+DATABASE_BUSY_TIMEOUT_MS=5000
+TRUST_PROXY=true
+
+# Private SeaweedFS S3 configuration
+S3_REGION=us-east-1
+S3_BUCKET=announcements-v2
+S3_ACCESS_KEY_ID=replace-with-a-random-access-key
+S3_SECRET_ACCESS_KEY=replace-with-a-long-random-secret
+S3_CONNECT_TIMEOUT_MS=2000
+# Maximum socket inactivity during one S3 operation (not a total upload deadline).
+S3_REQUEST_TIMEOUT_MS=5000
+S3_MAX_ATTEMPTS=2
+S3_HEALTH_PROBE_INTERVAL_MS=30000
+
+# Image upload and decode limits. The default proxy body limit is 512 MiB,
+# which accommodates the default twenty 25 MiB files plus multipart overhead.
+UPLOAD_MAX_FILE_BYTES=26214400
+UPLOAD_MAX_FILES=20
+IMAGE_MAX_INPUT_PIXELS=40000000
+# UPLOAD_TEMP_DIRECTORY=/tmp/announcements-uploads
+
+# Optional integrations. Leave blank to disable them during Phase 2.
+MQTT_URL=
+MQTT_USERNAME=
+MQTT_PASSWORD=
+HA_WEBHOOK_URL=
+HA_WEBHOOK_SECRET=

.gitignore

@@ -1 +1,16 @@
-node_modules
+node_modules/
+.pnpm-store/
+
+# Local configuration and secrets
+.env
+.env.*
+!.env.example
+
+# Local build and runtime data
+dist/
+*.sqlite
+*.sqlite-shm
+*.sqlite-wal
+*.sqlite-journal
+data/
+backups/

README.md

@@ -0,0 +1,195 @@
+# Announcements v2
+
+Announcements is a small Express, React, Socket.IO, MQTT, SQLite, and
+S3-compatible signage application. Version 2 is being built in phases and is
+intended to run beside the existing production version until cutover.
+
+## Development
+
+The repository is a pnpm workspace with one lockfile. It requires Node.js
+22.13 or newer and pnpm 10.29.3.
+
+```sh
+cp .env.example .env
+pnpm install --frozen-lockfile
+pnpm check
+docker compose up --build
+```
+
+Only the Nginx web service publishes a host port (5175 by default). The API and
+SeaweedFS S3 endpoint remain private on Compose networks. Replace the example
+S3 credentials before starting the stack.
+
+## Library assets
+
+`POST /api/assets` accepts multipart uploads in the repeated `file` or `files`
+field. An optional `display_name` (or `displayName`) is accepted for a
+single-file upload. Supported decoded formats are still JPEG, PNG, and WebP;
+extensions and multipart content types are not trusted. Animated, multipage,
+malformed, unsupported, oversized, and excessive-pixel inputs are rejected.
+
+Default limits are:
+
+- 25 MiB per file (`UPLOAD_MAX_FILE_BYTES`)
+- 20 files per request (`UPLOAD_MAX_FILES`)
+- 40 million decoded pixels per image (`IMAGE_MAX_INPUT_PIXELS`)
+
+Nginx accepts up to 512 MiB per request, enough for the default aggregate plus
+multipart overhead. If the backend limits are raised, update
+`client_max_body_size` in `client/nginx.conf` as well. Proxied API requests use
+a ten-minute inactivity timeout so a valid large batch can finish processing.
+
+Original bytes are archived unchanged. Content identity is the SHA-256 of
+those bytes, so uploading the same content returns the existing asset even
+when the filename differs. Display-name collisions with different content
+return `409 ASSET_NAME_CONFLICT`. Multi-file uploads validate every new image
+locally before persisting any of them. If a later storage operation fails,
+already completed items remain valid and retrying the request is idempotent.
+
+Sharp produces two metadata-free, auto-oriented WebP renditions:
+
+- display: inside-fit at most 1920×1080, quality 82
+- thumbnail: inside-fit at most 480×270, quality 72
+
+Neither rendition crops or upscales. Transparency is flattened against black.
+Presentation effects such as blur, shadows, darkening, and framing are not
+baked into stored media.
+
+## Asset and media API
+
+- `GET /api/assets`
+- `POST /api/assets`
+- `GET /api/assets/:assetId`
+- `PATCH /api/assets/:assetId`
+- `GET /api/assets/:assetId/references`
+- `DELETE /api/assets/:assetId`
+- `GET /api/assets/:assetId/original`
+- `GET /media/assets/:assetId/display/:sha256.webp`
+- `GET /media/assets/:assetId/thumbnail/:sha256.webp`
+
+PATCH accepts only display name and expiration. A null expiration is permanent.
+Manual deletion refuses playlist, current playback, and static references. It
+marks an asset as deleting before idempotently removing its three objects and
+removes SQLite metadata only after storage succeeds. A failed processing row
+can be inspected, safely deleted, and uploaded again; no automatic retry loop
+is run.
+
+Media URLs are derived from SQLite metadata and never accept object keys. The
+display and thumbnail routes stream private S3 objects through the API with a
+one-year immutable cache policy. Original downloads use private, no-store
+caching.
+
+## Playlists
+
+Playlist and entry metadata is authoritative in SQLite. The API surface is:
+
+- `GET /api/playlists`
+- `POST /api/playlists`
+- `GET /api/playlists/:playlistId`
+- `PATCH /api/playlists/:playlistId`
+- `DELETE /api/playlists/:playlistId`
+- `POST /api/playlists/:playlistId/entries`
+- `PATCH /api/playlists/:playlistId/entries/:entryId`
+- `DELETE /api/playlists/:playlistId/entries/:entryId`
+- `PUT /api/playlists/:playlistId/entries/order`
+- `POST /api/playlists/:playlistId/activate`
+
+Entry positions are zero-based and contiguous. Reordering requires the complete
+ordered list as `{ "entryIds": [...] }`. An asset can occur only once in a
+playlist, but the same asset can be used independently by any number of other
+playlists. Only ready, unexpired assets can be newly added.
+
+Entry duration overrides may be null (inherit the global setting) or 1,000 to
+3,600,000 milliseconds. Presentation overrides are nullable; darkening is an
+inherit/off/on boolean and blur always comes from the global setting. Schedule
+instants use epoch milliseconds or ISO strings with an explicit `Z` or numeric
+UTC offset, and intervals are evaluated as `[start, end)`.
+
+Playlist detail responses include effective duration and presentation,
+server-evaluated eligibility, immutable display/thumbnail URLs, and the
+settings revision and evaluation time used. Playlist revisions increment once
+per semantic content change. Exact no-ops and reads do not increment them.
+
+Before a playback-relevant playlist, settings, or asset mutation, the playback
+service catches up using the old metadata. The domain transaction then commits
+and playback synchronously reconciles the new values at the mutation instant.
+This prevents a late timer or restart boundary from being rewritten by a later
+edit. If the post-commit reconciliation unexpectedly fails, the API returns an
+error even though the preceding domain commit may already be durable; clients
+must refetch current state before deciding whether to retry.
+
+Activation is explicit. A request is held in the existing pending-activation
+state while a playable normal slide is mid-duration; otherwise the target
+playlist is prepared immediately at its first currently playable entry. The
+output-off flag remains only a visual gate, and static hold is preserved while
+the hidden normal playlist changes. The authoritative playback service consumes
+a pending activation at the current slide boundary and never merges the old and
+new playlists.
+
+Socket.IO publishes `playlists:changed` as a refetch invalidation after
+committed playlist changes and after settings or referenced-asset edits that
+affect resolved playlist data. Socket.IO is not a mutation API.
+
+## Authoritative playback
+
+One serialized service owns persisted global playback, timer reconciliation,
+and every playback control path. Its REST surface is:
+
+- `GET /api/playback`
+- `POST /api/playback/pause`
+- `POST /api/playback/resume`
+- `POST /api/playback/next`
+- `POST /api/playback/previous`
+- `POST /api/playback/static`
+- `PUT /api/playback/mode`
+- `POST /api/playback/reload`
+
+Visual output precedence is mode off (black), a valid static asset, the current
+normal entry, then black when no playable target exists. Mode off is only a
+visual gate: normal playback continues underneath unless it is independently
+paused or held by static mode. Pause and static both preserve the normal cursor
+and remaining duration. Resume clears both static and paused state together and
+continues the normal entry with its preserved remaining time. Next and previous
+wrap across currently playable entries; they change the held entry without
+unpausing when paused and are no-ops while static.
+
+Normal slides use persisted absolute start times and deadlines. Chained
+timeouts reconcile from the prior authoritative deadline, including late
+callbacks and restart catch-up, so delays do not accumulate as timing drift.
+The service also arms exact schedule and asset-expiration boundaries. It skips
+disabled, out-of-schedule, expired, and non-ready entries, and safely returns to
+an eligible entry when one becomes available. Pending playlist activation is
+applied at the current normal slide boundary; an empty target playlist still
+becomes active with black normal output.
+
+Socket.IO sends `playback:state` immediately on connection and after meaningful
+committed playback changes. The authoritative snapshot includes server time and
+revisions, mode and transport state, active playlist and timeline data, current
+and static targets, crossfade settings, and a display-cache manifest with
+effective duration, presentation, scheduling, expiration, and immutable media
+metadata. Enabled future-scheduled entries remain in the manifest; disabled
+entries and private S3 details do not. Reads and connections do not increment
+the playback revision.
+
+Phase 3B exposes this state and behavior through REST and Socket.IO only. MQTT
+command wiring and the browser display renderer remain later phases.
+
+Deleting a library asset that is the current static target is still refused by
+the Phase 2 deletion model. That refusal is a known interim integration point,
+not the intended final behavior: deleting the statically held slide is meant to
+exit static safely, return to normal rotation, and only then delete the asset.
+Phase 3B does not depend on the refusal, so the change belongs to the later
+phase that revisits asset lifecycle.
+
+## Storage and health
+
+The API uses a small path-style S3 adapter configured by `S3_ENDPOINT`,
+`S3_REGION`, `S3_BUCKET`, `S3_ACCESS_KEY_ID`, and `S3_SECRET_ACCESS_KEY`.
+Connection timeout, socket-inactivity timeout (`S3_REQUEST_TIMEOUT_MS`),
+attempts, and background probe interval are configurable in `.env.example`.
+Startup verifies or safely creates only the configured bucket.
+
+Storage outages do not stop the API or fail process readiness. `/health/ready`
+reports storage as degraded while remaining HTTP 200 when SQLite and the API
+runtime are healthy. `/api/health` and `/api/status` expose cached, redacted
+storage state and recover after a successful probe or storage operation.

client/Dockerfile

@@ -1,14 +1,24 @@
-FROM node:22-alpine AS build
+FROM node:22.23.2-bookworm-slim AS build
+
+ARG PNPM_VERSION=10.29.3
+
 WORKDIR /app
 
-RUN corepack enable
+RUN corepack enable && corepack prepare "pnpm@${PNPM_VERSION}" --activate
 
-COPY package.json pnpm-lock.yaml ./
+COPY package.json pnpm-workspace.yaml pnpm-lock.yaml ./
-RUN pnpm install --frozen-lockfile
+COPY server/package.json ./server/package.json
+COPY client/package.json ./client/package.json
 
-COPY . .
+RUN pnpm install --frozen-lockfile --filter @announcements/client...
-RUN pnpm build
+
+COPY client ./client
+
+RUN pnpm --filter @announcements/client build
+
+FROM nginx:1.30.4-alpine
+
+COPY client/nginx.conf /etc/nginx/conf.d/default.conf
+COPY --from=build /app/client/dist /usr/share/nginx/html
 
-FROM nginx:alpine
-COPY --from=build /app/dist /usr/share/nginx/html
 EXPOSE 80

client/nginx.conf

@@ -0,0 +1,50 @@
+map $http_upgrade $connection_upgrade {
+    default upgrade;
+    '' close;
+}
+
+server {
+    listen 80;
+    listen [::]:80;
+    server_name _;
+
+    root /usr/share/nginx/html;
+    index index.html;
+    # Matches the default API allowance of twenty 25 MiB files plus multipart
+    # overhead. Keep this in sync if the backend upload limits are raised.
+    client_max_body_size 512m;
+
+    resolver 127.0.0.11 valid=10s ipv6=off;
+    set $api_origin http://api:7532;
+
+    location ~ ^/(api|health|media)(/|$) {
+        proxy_pass $api_origin;
+        proxy_http_version 1.1;
+        proxy_connect_timeout 5s;
+        # Multipart requests return only after image processing and private-S3
+        # writes complete. This is an inactivity timeout, not a size limit.
+        proxy_read_timeout 10m;
+        proxy_send_timeout 10m;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    location /socket.io/ {
+        proxy_pass $api_origin;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection $connection_upgrade;
+        proxy_buffering off;
+        proxy_read_timeout 75s;
+    }
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+}

client/package.json

@@ -1,8 +1,11 @@
 {
-  "name": "client",
+  "name": "@announcements/client",
   "private": true,
   "version": "0.0.0",
   "type": "module",
+  "engines": {
+    "node": ">=22.13.0"
+  },
   "scripts": {
     "dev": "vite",
     "build": "vite build",

client/src/App.jsx

@@ -2,7 +2,7 @@ import { useEffect, useState } from "react";
 import { io } from "socket.io-client";
 import "./App.css";
 
-const socket = io("http://10.40.0.2:7532");
+const socket = io();
 
 export default function App() {
   const [slides, setSlides] = useState([]);

client/vite.config.js

@@ -1,7 +1,20 @@
-import { defineConfig } from 'vite'
+import { defineConfig, loadEnv } from "vite";
-import react from '@vitejs/plugin-react'
+import react from "@vitejs/plugin-react";
 
-// https://vite.dev/config/
+export default defineConfig(({ mode }) => {
-export default defineConfig({
+  const environment = loadEnv(mode, ".", "VITE_");
-  plugins: [react()],
+  const target = environment.VITE_API_PROXY_TARGET || "http://127.0.0.1:7532";
-})
+  const proxy = { target, changeOrigin: true };
+
+  return {
+    plugins: [react()],
+    server: {
+      proxy: {
+        "/api": proxy,
+        "/health": proxy,
+        "/media": proxy,
+        "/socket.io": { ...proxy, ws: true },
+      },
+    },
+  };
+});

docker-compose.yaml

@@ -1,20 +1,111 @@
+name: "${COMPOSE_PROJECT_NAME:-announcements-v2}"
+
 services:
-  announcements-server:
+  web:
+    build:
+      context: .
+      dockerfile: client/Dockerfile
+    restart: unless-stopped
+    init: true
+    ports:
+      - "${WEB_PORT:-5175}:80"
+    depends_on:
+      api:
+        condition: service_healthy
+    networks:
+      - app
+    healthcheck:
+      test: ["CMD", "wget", "-q", "--spider", "http://127.0.0.1/"]
+      interval: 15s
+      timeout: 5s
+      retries: 3
+      start_period: 10s
+
+  api:
     build:
       context: .
       dockerfile: server/Dockerfile
-    container_name: announcements-server
     restart: unless-stopped
-    ports:
+    init: true
-      - "7532:7532"
+    environment:
-
+      NODE_ENV: production
-  announcements-client:
+      HOST: 0.0.0.0
-    build:
+      PORT: "7532"
-      context: ./client
+      DATABASE_PATH: /data/db/announcements.sqlite
-      dockerfile: Dockerfile
+      APP_TIMEZONE: "${APP_TIMEZONE:-America/Chicago}"
-    container_name: announcements-client
+      SHUTDOWN_TIMEOUT_MS: "${SHUTDOWN_TIMEOUT_MS:-10000}"
-    restart: unless-stopped
+      DATABASE_BUSY_TIMEOUT_MS: "${DATABASE_BUSY_TIMEOUT_MS:-5000}"
-    ports:
+      TRUST_PROXY: "${TRUST_PROXY:-true}"
-      - "5174:80"
+      S3_ENDPOINT: http://seaweedfs:8333
+      S3_REGION: "${S3_REGION:-us-east-1}"
+      S3_BUCKET: "${S3_BUCKET:-announcements-v2}"
+      S3_ACCESS_KEY_ID: "${S3_ACCESS_KEY_ID:?Set S3_ACCESS_KEY_ID in .env}"
+      S3_SECRET_ACCESS_KEY: "${S3_SECRET_ACCESS_KEY:?Set S3_SECRET_ACCESS_KEY in .env}"
+      S3_FORCE_PATH_STYLE: "true"
+      S3_CONNECT_TIMEOUT_MS: "${S3_CONNECT_TIMEOUT_MS:-2000}"
+      S3_REQUEST_TIMEOUT_MS: "${S3_REQUEST_TIMEOUT_MS:-5000}"
+      S3_MAX_ATTEMPTS: "${S3_MAX_ATTEMPTS:-2}"
+      S3_HEALTH_PROBE_INTERVAL_MS: "${S3_HEALTH_PROBE_INTERVAL_MS:-30000}"
+      UPLOAD_TEMP_DIRECTORY: /tmp/announcements-uploads
+      UPLOAD_MAX_FILE_BYTES: "${UPLOAD_MAX_FILE_BYTES:-26214400}"
+      UPLOAD_MAX_FILES: "${UPLOAD_MAX_FILES:-20}"
+      IMAGE_MAX_INPUT_PIXELS: "${IMAGE_MAX_INPUT_PIXELS:-40000000}"
+      MQTT_URL: "${MQTT_URL:-}"
+      MQTT_USERNAME: "${MQTT_USERNAME:-}"
+      MQTT_PASSWORD: "${MQTT_PASSWORD:-}"
+      HA_WEBHOOK_URL: "${HA_WEBHOOK_URL:-}"
+      HA_WEBHOOK_SECRET: "${HA_WEBHOOK_SECRET:-}"
+    volumes:
+      - app-data:/data
     depends_on:
-      - announcements-server
+      seaweedfs:
+        condition: service_started
+    networks:
+      - app
+      - storage
+    healthcheck:
+      test:
+        - CMD
+        - node
+        - -e
+        - "fetch('http://127.0.0.1:7532/health/ready').then((response) => process.exit(response.ok ? 0 : 1)).catch(() => process.exit(1))"
+      interval: 15s
+      timeout: 5s
+      retries: 5
+      start_period: 15s
+    stop_grace_period: 15s
+
+  seaweedfs:
+    image: chrislusf/seaweedfs:4.39
+    restart: unless-stopped
+    command: ["mini", "-dir=/data", "-ip=seaweedfs"]
+    environment:
+      AWS_ACCESS_KEY_ID: "${S3_ACCESS_KEY_ID:?Set S3_ACCESS_KEY_ID in .env}"
+      AWS_SECRET_ACCESS_KEY: "${S3_SECRET_ACCESS_KEY:?Set S3_SECRET_ACCESS_KEY in .env}"
+      S3_BUCKET: "${S3_BUCKET:-announcements-v2}"
+    volumes:
+      - seaweedfs-data:/data
+    expose:
+      - "8333"
+    networks:
+      - storage
+    healthcheck:
+      test:
+        - CMD-SHELL
+        - >-
+          wget -q -O /dev/null http://127.0.0.1:9333/readyz &&
+          wget -q -O /dev/null http://127.0.0.1:8333/readyz
+      interval: 15s
+      timeout: 5s
+      retries: 5
+      start_period: 20s
+    stop_grace_period: 30s
+
+networks:
+  app:
+  storage:
+    internal: true
+
+volumes:
+  app-data:
+  seaweedfs-data:

package.json

@@ -1,24 +1,19 @@
 {
-  "name": "Annoucements",
+  "name": "announcements",
-  "version": "1.0.0",
+  "version": "2.0.0",
-  "description": "",
+  "private": true,
-  "main": "index.js",
+  "description": "Church announcement management and signage",
   "scripts": {
-    "dev": "nodemon server/index.js",
+    "dev:server": "pnpm --filter @announcements/server dev",
-    "start": "node server/index.js"
+    "dev:client": "pnpm --filter @announcements/client dev",
+    "start": "pnpm --filter @announcements/server start",
+    "build": "pnpm --filter @announcements/client build",
+    "lint": "pnpm --filter @announcements/client lint",
+    "test": "pnpm --filter @announcements/server test",
+    "check": "pnpm lint && pnpm test && pnpm build"
   },
-  "keywords": [],
+  "engines": {
-  "author": "",
+    "node": ">=22.13.0"
-  "license": "ISC",
-  "packageManager": "[email protected]",
-  "dependencies": {
-    "cors": "^2.8.6",
-    "express": "^5.2.1",
-    "fast-xml-parser": "^5.8.0",
-    "mqtt": "^5.15.1",
-    "socket.io": "^4.8.3"
   },
-  "devDependencies": {
+  "packageManager": "[email protected]"
-    "nodemon": "^3.1.14"
-  }
 }

pnpm-workspace.yaml

@@ -0,0 +1,7 @@
+packages:
+  - client
+  - server
+
+onlyBuiltDependencies:
+  - better-sqlite3
+  - sharp

server/Dockerfile

@@ -1,13 +1,32 @@
-FROM node:22-alpine
+FROM node:22.23.2-bookworm-slim AS dependencies
+
+ARG PNPM_VERSION=10.29.3
+
 WORKDIR /app
 
-RUN corepack enable
+RUN apt-get update \
+    && apt-get install --yes --no-install-recommends python3 make g++ \
+    && rm -rf /var/lib/apt/lists/*
 
-COPY package.json pnpm-lock.yaml ./
+RUN corepack enable && corepack prepare "pnpm@${PNPM_VERSION}" --activate
-RUN pnpm install --frozen-lockfile --prod
+
+COPY package.json pnpm-workspace.yaml pnpm-lock.yaml ./
+COPY server/package.json ./server/package.json
+COPY client/package.json ./client/package.json
+
+RUN pnpm install --frozen-lockfile --prod --filter @announcements/server...
 
 COPY server ./server
 
+FROM node:22.23.2-bookworm-slim
+
+WORKDIR /app
+
+COPY --from=dependencies /app/node_modules ./node_modules
+COPY --from=dependencies /app/server ./server
+
+ENV NODE_ENV=production
+
 EXPOSE 7532
 
-CMD ["node", "server/index.js"]
+CMD ["node", "server/src/index.js"]

server/index.js

@@ -1,131 +0,0 @@
-const express = require("express");
-const http = require("http");
-const { Server } = require("socket.io");
-const cors = require("cors");
-
-const app = express();
-app.use(cors());
-
-const server = http.createServer(app);
-
-const io = new Server(server, {
-  cors: {
-    origin: "*",
-  },
-});
-
-const PORT = 7532;
-
-let currentSlide = 0;
-const slideSeconds = 7;
-
-const { XMLParser } = require("fast-xml-parser");
-
-let slides = [];
-
-async function loadSlides() {
-  try {
-    const response = await fetch(
-      "http://10.40.0.2:9000/announcements?list-type=2"
-    );
-
-    const xml = await response.text();
-
-    const parser = new XMLParser();
-    const data = parser.parse(xml);
-
-    const contents = data.ListBucketResult?.Contents || [];
-
-    const files = Array.isArray(contents)
-      ? contents
-      : [contents];
-
-    slides = files
-      .map((file) => file.Key)
-      .filter((name) =>
-        /\.(png|jpg|jpeg|webp)$/i.test(name)
-      )
-      .map((name) => {
-        const encodedName = name
-          .split("/")
-          .map((part) => encodeURIComponent(part))
-          .join("/");
-
-        return `http://10.40.0.2:9000/announcements/${encodedName}`;
-      });
-
-    console.log("Slides loaded:", slides.length);
-
-    if (currentSlide >= slides.length) {
-      currentSlide = 0;
-    }
-
-    broadcastState();
-  } catch (err) {
-    console.error("Failed to load slides:", err);
-  }
-}
-
-const mqtt = require("mqtt");
-
-let mode = "on";
-
-const mqttClient = mqtt.connect("mqtt://10.40.0.2");
-
-mqttClient.on("connect", () => {
-  console.log("MQTT connected");
-  mqttClient.subscribe("announcements/mode");
-});
-
-mqttClient.on("message", (topic, message) => {
-  if (topic === "announcements/mode") {
-    const value = message.toString().trim().toLowerCase();
-
-    if (value === "on" || value === "off") {
-      mode = value;
-      broadcastState();
-      console.log("Announcement mode:", mode);
-    }
-  }
-});
-
-function broadcastState() {
-  io.emit("slideshow:state", {
-    currentSlide,
-    slides,
-    slideSeconds,
-    mode,
-  });
-}
-
-io.on("connection", (socket) => {
-  console.log("Client connected:", socket.id);
-
-  socket.emit("slideshow:state", {
-    currentSlide,
-    slides,
-    slideSeconds,
-    mode,
-  });
-});
-
-setInterval(() => {
-  if (slides.length === 0) return;
-
-  currentSlide = (currentSlide + 1) % slides.length;
-  broadcastState();
-}, slideSeconds * 1000);
-
-app.get("/", (req, res) => {
-  res.send("Announcement server is running");
-});
-
-loadSlides();
-
-setInterval(() => {
-  loadSlides();
-}, 30000);
-
-server.listen(PORT, () => {
-  console.log(`Announcement server running on http://10.40.0.2:${PORT}`);
-});

server/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "@announcements/server",
+  "version": "2.0.0",
+  "private": true,
+  "description": "Announcements v2 API and realtime server",
+  "main": "src/index.js",
+  "scripts": {
+    "dev": "node --watch src/index.js",
+    "start": "node src/index.js",
+    "test": "node --test"
+  },
+  "engines": {
+    "node": ">=22.13.0"
+  },
+  "dependencies": {
+    "@aws-sdk/client-s3": "3.1101.0",
+    "better-sqlite3": "13.0.2",
+    "dotenv": "^16.5.0",
+    "express": "^5.2.1",
+    "multer": "2.0.2",
+    "sharp": "0.35.3",
+    "socket.io": "^4.8.3"
+  }
+}

server/src/app.js

@@ -0,0 +1,182 @@
+const express = require("express");
+const {
+  createDetailedHealthRouter,
+  createHealthRouter,
+} = require("./health/routes");
+const { createAssetRouter } = require("./assets/routes");
+const { createMediaRouter } = require("./assets/media-routes");
+const { createAssetService } = require("./assets/service");
+const { createPlaybackService } = require("./playback");
+const { createPlaybackRouter } = require("./playback/routes");
+const {
+  createPlaylistRouter,
+  createPlaylistService,
+} = require("./playlists");
+const { createSettingsRouter } = require("./settings/routes");
+const { createSettingsService } = require("./settings/service");
+
+function safeNotifier(notifier, logger, failureMessage) {
+  const warn = (error) => {
+    try {
+      logger?.warn?.(failureMessage, error);
+    } catch {
+      // A best-effort notification or warning must not undo a database commit.
+    }
+  };
+  return (event) => {
+    try {
+      const result = notifier(event);
+      result?.catch?.(warn);
+    } catch (error) {
+      warn(error);
+    }
+  };
+}
+
+function createApp({
+  config,
+  database,
+  imageProcessor,
+  lifecycle,
+  logger = console,
+  migrations,
+  now = Date.now,
+  onPlaylistsChanged = () => {},
+  playbackService: suppliedPlaybackService,
+  storage,
+}) {
+  const app = express();
+  const notifyPlaylistsChanged = safeNotifier(
+    onPlaylistsChanged,
+    logger,
+    "Playlist invalidation notification failed",
+  );
+  const playbackService =
+    suppliedPlaybackService ||
+    createPlaybackService({
+      database,
+      now,
+      onActivationChanged: notifyPlaylistsChanged,
+    });
+  if (!suppliedPlaybackService) {
+    playbackService.initialize();
+  }
+  const reconcilePlaybackDomain = (change) =>
+    playbackService.domainChanged(change);
+  const reconcileBeforeDomainChange = () =>
+    playbackService.reconcile("before_domain_change");
+  const notifyPlaylistMutation = (change) => {
+    reconcilePlaybackDomain(change);
+    const publicChange = { ...change };
+    delete publicChange.invalidBoundaryChanged;
+    notifyPlaylistsChanged(publicChange);
+  };
+  const settingsService = createSettingsService(database);
+  const assetService = createAssetService({
+    database,
+    imageProcessor,
+    storage,
+  });
+  const playlistService = createPlaylistService({
+    database,
+    now,
+    onBeforeChange: reconcileBeforeDomainChange,
+    onChanged: notifyPlaylistMutation,
+  });
+  app.locals.playbackService = playbackService;
+
+  app.disable("x-powered-by");
+  app.set("trust proxy", config.trustProxy);
+  app.use(express.json({ limit: "1mb" }));
+
+  app.get("/api", (request, response) => {
+    response.json({ name: "Announcements API", version: 2 });
+  });
+  app.use(
+    "/health",
+    createHealthRouter({ database, lifecycle, migrations, storage }),
+  );
+  const detailedHealthRouterOptions = {
+    config,
+    database,
+    lifecycle,
+    migrations,
+    storage,
+  };
+  app.use(
+    "/api/health",
+    createDetailedHealthRouter(detailedHealthRouterOptions),
+  );
+  app.use(
+    "/api/status",
+    createDetailedHealthRouter(detailedHealthRouterOptions),
+  );
+  app.use(
+    "/api/settings",
+    createSettingsRouter(settingsService, {
+      onBeforePlaybackDomainChange: reconcileBeforeDomainChange,
+      onPlaylistsChanged: notifyPlaylistsChanged,
+      onPlaybackDomainChanged: reconcilePlaybackDomain,
+    }),
+  );
+  app.use(
+    "/api/assets",
+    createAssetRouter({
+      assetService,
+      onBeforePlaybackDomainChange: reconcileBeforeDomainChange,
+      onPlaylistsChanged: notifyPlaylistsChanged,
+      onPlaybackDomainChanged: reconcilePlaybackDomain,
+      processingConfig: config.processing,
+    }),
+  );
+  app.use(
+    "/api/playlists",
+    createPlaylistRouter(playlistService, {
+      playbackService,
+    }),
+  );
+  app.use("/api/playback", createPlaybackRouter(playbackService));
+  app.use("/media", createMediaRouter(assetService));
+
+  app.use((request, response) => {
+    response.status(404).json({
+      error: {
+        code: "NOT_FOUND",
+        message: "Route not found",
+      },
+    });
+  });
+
+  app.use((error, request, response, next) => {
+    if (response.headersSent) {
+      next(error);
+      return;
+    }
+
+    if (error instanceof SyntaxError && error.status === 400 && "body" in error) {
+      response.status(400).json({
+        error: {
+          code: "INVALID_JSON",
+          message: "Request body must contain valid JSON",
+        },
+      });
+      return;
+    }
+
+    const statusCode = error.statusCode || 500;
+    response.status(statusCode).json({
+      error: {
+        code: error.code || "INTERNAL_ERROR",
+        message:
+          statusCode >= 500 ? "An internal server error occurred" : error.message,
+        ...(error.details ? { details: error.details } : {}),
+      },
+    });
+  });
+
+  return app;
+}
+
+module.exports = {
+  createApp,
+};

server/src/assets/errors.js

@@ -0,0 +1,23 @@
+class AssetError extends Error {
+  constructor(code, message, { statusCode = 400, details, cause } = {}) {
+    super(message, cause ? { cause } : undefined);
+    this.name = "AssetError";
+    this.code = code;
+    this.statusCode = statusCode;
+    if (details !== undefined) {
+      this.details = details;
+    }
+  }
+}
+
+function assetNotFound(assetId) {
+  return new AssetError("ASSET_NOT_FOUND", "Library asset not found", {
+    statusCode: 404,
+    details: { assetId },
+  });
+}
+
+module.exports = {
+  AssetError,
+  assetNotFound,
+};

server/src/assets/media-routes.js

@@ -0,0 +1,49 @@
+const express = require("express");
+const { sendImmutableMedia } = require("./streaming");
+
+function createMediaRouter(assetService) {
+  const router = express.Router();
+
+  async function sendMedia(request, response, next, kind) {
+    const version = request.params.version;
+    if (!version.endsWith(".webp")) {
+      response.status(404).json({
+        error: {
+          code: "MEDIA_NOT_FOUND",
+          message: "Asset media version not found",
+        },
+      });
+      return;
+    }
+
+    try {
+      const descriptor = assetService.mediaDescriptor(
+        request.params.assetId,
+        kind,
+        version.slice(0, -".webp".length),
+      );
+      await sendImmutableMedia(assetService, response, descriptor);
+    } catch (error) {
+      if (response.headersSent) {
+        response.destroy(error);
+        return;
+      }
+      next(error);
+    }
+  }
+
+  router.get("/assets/:assetId/display/:version", (request, response, next) =>
+    sendMedia(request, response, next, "display"),
+  );
+  router.get(
+    "/assets/:assetId/thumbnail/:version",
+    (request, response, next) =>
+      sendMedia(request, response, next, "thumbnail"),
+  );
+
+  return router;
+}
+
+module.exports = {
+  createMediaRouter,
+};

server/src/assets/multipart.js

@@ -0,0 +1,235 @@
+const crypto = require("node:crypto");
+const fs = require("node:fs");
+const path = require("node:path");
+const multer = require("multer");
+const { AssetError } = require("./errors");
+
+const ALLOWED_FILE_FIELDS = new Set(["file", "files"]);
+const ALLOWED_TEXT_FIELDS = new Set(["display_name", "displayName"]);
+const MAX_FIELD_BYTES = 4 * 1024;
+const MAX_ORIGINAL_FILENAME_LENGTH = 255;
+const TEMPORARY_UPLOAD_PATHS = Symbol("temporaryUploadPaths");
+const TEMP_STORAGE_ERROR_CODES = new Set([
+  "EACCES",
+  "EEXIST",
+  "EIO",
+  "EMFILE",
+  "ENFILE",
+  "ENOSPC",
+  "ENOTDIR",
+  "EPERM",
+  "EROFS",
+]);
+
+function safeOriginalFilename(value) {
+  const normalized = String(value || "")
+    .replaceAll("\\", "/")
+    .replace(/[\u0000-\u001f\u007f]/g, "");
+  const leafName = path.posix.basename(normalized);
+  const bounded = [...leafName].slice(0, MAX_ORIGINAL_FILENAME_LENGTH).join("");
+
+  if (!bounded.trim()) {
+    throw new AssetError(
+      "INVALID_ORIGINAL_FILENAME",
+      "Uploaded files must include a usable filename",
+    );
+  }
+  return bounded;
+}
+
+function mapMulterError(error, config) {
+  if (!(error instanceof multer.MulterError)) {
+    if (TEMP_STORAGE_ERROR_CODES.has(error?.code)) {
+      return new AssetError(
+        "UPLOAD_TEMP_STORAGE_UNAVAILABLE",
+        "Temporary upload storage is unavailable",
+        { statusCode: 503, cause: error },
+      );
+    }
+    return new AssetError(
+      "INVALID_MULTIPART_UPLOAD",
+      "The multipart upload could not be read",
+      { cause: error },
+    );
+  }
+
+  if (error.code === "LIMIT_FILE_SIZE") {
+    return new AssetError(
+      "UPLOAD_FILE_TOO_LARGE",
+      "An uploaded file exceeds the configured size limit",
+      {
+        statusCode: 413,
+        details: { maxFileBytes: config.maxFileBytes },
+      },
+    );
+  }
+  if (error.code === "LIMIT_FILE_COUNT") {
+    return new AssetError(
+      "UPLOAD_FILE_COUNT_EXCEEDED",
+      "The upload contains too many files",
+      {
+        statusCode: 413,
+        details: { maxFiles: config.maxFiles },
+      },
+    );
+  }
+  if (
+    [
+      "LIMIT_FIELD_COUNT",
+      "LIMIT_FIELD_KEY",
+      "LIMIT_FIELD_VALUE",
+      "LIMIT_PART_COUNT",
+      "LIMIT_UNEXPECTED_FILE",
+    ].includes(error.code)
+  ) {
+    return new AssetError(
+      "INVALID_MULTIPART_UPLOAD",
+      "The multipart upload contains too many or invalid parts",
+      { details: { reason: error.code } },
+    );
+  }
+
+  return new AssetError(
+    "INVALID_MULTIPART_UPLOAD",
+    "The multipart upload could not be read",
+    { details: { reason: error.code } },
+  );
+}
+
+function createTemporaryStorage(tempDirectory) {
+  return multer.diskStorage({
+    destination(request, file, callback) {
+      fs.mkdir(tempDirectory, { recursive: true, mode: 0o700 }, (error) => {
+        callback(error, tempDirectory);
+      });
+    },
+    filename(request, file, callback) {
+      const temporaryName = crypto.randomUUID();
+      if (!request[TEMPORARY_UPLOAD_PATHS]) {
+        request[TEMPORARY_UPLOAD_PATHS] = [];
+      }
+      request[TEMPORARY_UPLOAD_PATHS].push(
+        path.join(tempDirectory, temporaryName),
+      );
+      callback(null, temporaryName);
+    },
+  });
+}
+
+function temporaryUploadFiles(request) {
+  const paths = new Set(request[TEMPORARY_UPLOAD_PATHS] || []);
+  for (const file of Array.isArray(request.files) ? request.files : []) {
+    if (file?.path) paths.add(file.path);
+  }
+  return [...paths].map((temporaryPath) => ({ path: temporaryPath }));
+}
+
+function createMultipartUpload(config) {
+  const middleware = multer({
+    storage: createTemporaryStorage(config.tempDirectory),
+    limits: {
+      fileSize: config.maxFileBytes,
+      files: config.maxFiles,
+      fields: 2,
+      parts: config.maxFiles + 2,
+      fieldNameSize: 64,
+      fieldSize: MAX_FIELD_BYTES,
+      headerPairs: 100,
+    },
+  }).any();
+
+  return function receiveAssetUpload(request, response) {
+    return new Promise((resolve, reject) => {
+      middleware(request, response, (error) => {
+        if (error) {
+          reject(mapMulterError(error, config));
+          return;
+        }
+
+        const files = Array.isArray(request.files) ? request.files : [];
+        try {
+          if (files.length === 0) {
+            throw new AssetError(
+              "UPLOAD_FILE_REQUIRED",
+              "At least one image file is required",
+            );
+          }
+
+          const unexpectedFile = files.find(
+            (file) => !ALLOWED_FILE_FIELDS.has(file.fieldname),
+          );
+          if (unexpectedFile) {
+            throw new AssetError(
+              "UNEXPECTED_UPLOAD_FIELD",
+              "Image files must use the file or files multipart field",
+              { details: { field: unexpectedFile.fieldname } },
+            );
+          }
+
+          const body = request.body || {};
+          const unknownFields = Object.keys(body).filter(
+            (name) => !ALLOWED_TEXT_FIELDS.has(name),
+          );
+          if (unknownFields.length > 0) {
+            throw new AssetError(
+              "UNEXPECTED_UPLOAD_FIELD",
+              "The multipart upload contains unsupported fields",
+              { details: { fields: unknownFields } },
+            );
+          }
+
+          if (
+            Object.hasOwn(body, "display_name") &&
+            Object.hasOwn(body, "displayName")
+          ) {
+            throw new AssetError(
+              "DUPLICATE_DISPLAY_NAME_FIELD",
+              "Provide only one display name field",
+            );
+          }
+
+          const displayName = body.display_name ?? body.displayName ?? null;
+          if (displayName !== null && files.length !== 1) {
+            throw new AssetError(
+              "DISPLAY_NAME_REQUIRES_SINGLE_FILE",
+              "An explicit display name can be used only with one uploaded file",
+            );
+          }
+
+          resolve({
+            displayName,
+            files: files.map((file) => ({
+              path: file.path,
+              byteSize: file.size,
+              originalFilename: safeOriginalFilename(file.originalname),
+              suppliedContentType: file.mimetype,
+            })),
+          });
+        } catch (validationError) {
+          reject(validationError);
+        }
+      });
+    });
+  };
+}
+
+async function cleanupTemporaryFiles(files = []) {
+  await Promise.all(
+    files.map(async (file) => {
+      if (!file?.path) return;
+      try {
+        await fs.promises.rm(file.path, { force: true });
+      } catch {
+        // Temporary cleanup is best-effort and must not mask the API result.
+      }
+    }),
+  );
+}
+
+module.exports = {
+  cleanupTemporaryFiles,
+  createMultipartUpload,
+  mapMulterError,
+  safeOriginalFilename,
+  temporaryUploadFiles,
+};

server/src/assets/routes.js

@@ -0,0 +1,137 @@
+const express = require("express");
+const {
+  cleanupTemporaryFiles,
+  createMultipartUpload,
+  temporaryUploadFiles,
+} = require("./multipart");
+const { sendOriginal } = require("./streaming");
+
+function createAssetRouter({
+  assetService,
+  onBeforePlaybackDomainChange = () => {},
+  onPlaylistsChanged = () => {},
+  onPlaybackDomainChanged = () => {},
+  processingConfig,
+}) {
+  const router = express.Router();
+  const receiveUpload = createMultipartUpload(processingConfig);
+
+  router.get("/", (request, response, next) => {
+    try {
+      response.json({ assets: assetService.list() });
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.post("/", async (request, response, next) => {
+    const cleanupAfterAbort = () => {
+      void cleanupTemporaryFiles(temporaryUploadFiles(request));
+    };
+    request.once("aborted", cleanupAfterAbort);
+
+    try {
+      const upload = await receiveUpload(request, response);
+      const results = await assetService.upload(upload.files, {
+        displayName: upload.displayName,
+      });
+      const createdCount = results.filter((result) => result.created).length;
+
+      if (results.length === 1) {
+        response.status(createdCount > 0 ? 201 : 200).json(results[0]);
+        return;
+      }
+
+      response.status(createdCount > 0 ? 201 : 200).json({
+        results,
+        createdCount,
+        duplicateCount: results.length - createdCount,
+      });
+    } catch (error) {
+      next(error);
+    } finally {
+      request.off("aborted", cleanupAfterAbort);
+      await cleanupTemporaryFiles(temporaryUploadFiles(request));
+    }
+  });
+
+  router.get("/:assetId/references", (request, response, next) => {
+    try {
+      response.json(assetService.references(request.params.assetId));
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.get("/:assetId/original", async (request, response, next) => {
+    try {
+      const descriptor = assetService.originalDescriptor(request.params.assetId);
+      await sendOriginal(assetService, response, descriptor);
+    } catch (error) {
+      if (response.headersSent) {
+        response.destroy(error);
+        return;
+      }
+      next(error);
+    }
+  });
+
+  router.get("/:assetId", (request, response, next) => {
+    try {
+      response.json(assetService.get(request.params.assetId));
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.patch("/:assetId", (request, response, next) => {
+    try {
+      const previous = assetService.get(request.params.assetId);
+      const playlistIds = [
+        ...new Set(
+          assetService
+            .references(request.params.assetId)
+            .playlists.map((reference) => reference.playlistId),
+        ),
+      ];
+      onBeforePlaybackDomainChange({
+        reason: "before_asset_update",
+        assetId: previous.id,
+      });
+      const updated = assetService.update(request.params.assetId, request.body);
+      if (updated.updatedAt !== previous.updatedAt) {
+        const change = {
+          reason: "asset_updated",
+          playlistIds,
+          assetId: updated.id,
+          ...(updated.expirationAt !== previous.expirationAt
+            ? { invalidBoundaryChanged: true }
+            : {}),
+        };
+        onPlaybackDomainChanged(change);
+        if (playlistIds.length > 0) {
+          const publicChange = { ...change };
+          delete publicChange.invalidBoundaryChanged;
+          onPlaylistsChanged(publicChange);
+        }
+      }
+      response.json(updated);
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.delete("/:assetId", async (request, response, next) => {
+    try {
+      response.json(await assetService.remove(request.params.assetId));
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  return router;
+}
+
+module.exports = {
+  createAssetRouter,
+};

server/src/assets/service.js

@@ -0,0 +1,835 @@
+const crypto = require("node:crypto");
+const fs = require("node:fs");
+const path = require("node:path");
+const { AssetError, assetNotFound } = require("./errors");
+const { StorageObjectNotFoundError } = require("../storage");
+
+const MAX_DISPLAY_NAME_LENGTH = 200;
+const MAX_PROCESSING_ERROR_LENGTH = 1_000;
+const CONCURRENT_UPLOAD_WAIT_MS = 15_000;
+const CONCURRENT_UPLOAD_POLL_MS = 50;
+const SHA256_PATTERN = /^[0-9a-f]{64}$/;
+
+function delay(milliseconds) {
+  return new Promise((resolve) => setTimeout(resolve, milliseconds));
+}
+
+function normalizeDisplayName(value) {
+  if (typeof value !== "string") {
+    throw new AssetError(
+      "INVALID_ASSET_DISPLAY_NAME",
+      "Asset display name must be a string",
+    );
+  }
+
+  const normalized = value
+    .replace(/[\u0000-\u001f\u007f]/g, " ")
+    .replace(/\s+/g, " ")
+    .trim();
+  if (!normalized) {
+    throw new AssetError(
+      "INVALID_ASSET_DISPLAY_NAME",
+      "Asset display name cannot be empty",
+    );
+  }
+  if ([...normalized].length > MAX_DISPLAY_NAME_LENGTH) {
+    throw new AssetError(
+      "INVALID_ASSET_DISPLAY_NAME",
+      `Asset display name cannot exceed ${MAX_DISPLAY_NAME_LENGTH} characters`,
+      { details: { maxLength: MAX_DISPLAY_NAME_LENGTH } },
+    );
+  }
+  return normalized;
+}
+
+function defaultDisplayName(originalFilename) {
+  const extension = path.extname(originalFilename);
+  const withoutExtension = extension
+    ? originalFilename.slice(0, -extension.length)
+    : originalFilename;
+  return normalizeDisplayName(withoutExtension);
+}
+
+function normalizeExpiration(value) {
+  if (value === null) return null;
+  if (Number.isSafeInteger(value) && value >= 0) return value;
+
+  if (typeof value === "string" && value.trim()) {
+    const timestamp = Date.parse(value);
+    if (Number.isSafeInteger(timestamp) && timestamp >= 0) {
+      return timestamp;
+    }
+  }
+
+  throw new AssetError(
+    "INVALID_ASSET_EXPIRATION",
+    "Asset expiration must be null, an epoch-millisecond integer, or an ISO date",
+  );
+}
+
+function mediaUrls(row) {
+  if (row.status !== "ready") {
+    return {
+      originalUrl: null,
+      displayUrl: null,
+      thumbnailUrl: null,
+    };
+  }
+  return {
+    originalUrl: `/api/assets/${row.id}/original`,
+    displayUrl: `/media/assets/${row.id}/display/${row.display_sha256}.webp`,
+    thumbnailUrl: `/media/assets/${row.id}/thumbnail/${row.thumbnail_sha256}.webp`,
+  };
+}
+
+function mapAsset(row) {
+  if (!row) return null;
+  const urls = mediaUrls(row);
+  return {
+    id: row.id,
+    displayName: row.display_name,
+    originalFilename: row.original_filename,
+    status: row.status,
+    processingError: row.processing_error || null,
+    sourceSha256: row.source_sha256,
+    expirationAt: row.expiration_at ?? null,
+    createdAt: row.created_at,
+    updatedAt: row.updated_at,
+    referenceCount: Number(row.reference_count || 0),
+    original: row.original_content_type
+      ? {
+          contentType: row.original_content_type,
+          byteSize: row.original_byte_size,
+          width: row.original_width,
+          height: row.original_height,
+          url: urls.originalUrl,
+        }
+      : null,
+    display: row.display_content_type
+      ? {
+          sha256: row.display_sha256,
+          contentType: row.display_content_type,
+          byteSize: row.display_byte_size,
+          width: row.display_width,
+          height: row.display_height,
+          url: urls.displayUrl,
+        }
+      : null,
+    thumbnail: row.thumbnail_content_type
+      ? {
+          sha256: row.thumbnail_sha256,
+          contentType: row.thumbnail_content_type,
+          byteSize: row.thumbnail_byte_size,
+          width: row.thumbnail_width,
+          height: row.thumbnail_height,
+          url: urls.thumbnailUrl,
+        }
+      : null,
+  };
+}
+
+async function hashFile(filename) {
+  const hash = crypto.createHash("sha256");
+  let byteSize = 0;
+  for await (const chunk of fs.createReadStream(filename)) {
+    byteSize += chunk.length;
+    hash.update(chunk);
+  }
+  return { sourceSha256: hash.digest("hex"), byteSize };
+}
+
+function objectKeys(assetId, processed) {
+  return {
+    original: `assets/${assetId}/original/${processed.original.sha256}`,
+    display: `assets/${assetId}/display/${processed.display.sha256}.webp`,
+    thumbnail: `assets/${assetId}/thumbnail/${processed.thumbnail.sha256}.webp`,
+  };
+}
+
+function boundedProcessingError(error) {
+  const code = typeof error?.code === "string" ? error.code : "PROCESSING_FAILED";
+  const message =
+    typeof error?.message === "string" && error.message
+      ? error.message
+      : "Asset processing failed";
+  return `${code}: ${message}`.slice(0, MAX_PROCESSING_ERROR_LENGTH);
+}
+
+function createAssetService({
+  database,
+  storage,
+  imageProcessor,
+  now = Date.now,
+  createId = crypto.randomUUID,
+  wait = delay,
+  concurrentUploadWaitMs = CONCURRENT_UPLOAD_WAIT_MS,
+}) {
+  const assetSelect = `
+    SELECT a.*,
+      (SELECT COUNT(*) FROM playlist_entries pe WHERE pe.asset_id = a.id)
+        AS reference_count
+    FROM assets a
+  `;
+  const listAssets = database.prepare(`${assetSelect} ORDER BY a.created_at DESC, a.id`);
+  const findById = database.prepare(`${assetSelect} WHERE a.id = ?`);
+  const findByHash = database.prepare(`${assetSelect} WHERE a.source_sha256 = ?`);
+  const findByName = database.prepare(`${assetSelect} WHERE a.display_name = ? COLLATE NOCASE`);
+  const insertProcessing = database.prepare(`
+    INSERT INTO assets (
+      id, source_sha256, display_name, original_filename, status,
+      created_at, updated_at
+    ) VALUES (
+      @id, @sourceSha256, @displayName, @originalFilename, 'processing',
+      @createdAt, @updatedAt
+    )
+  `);
+  const markReady = database.prepare(`
+    UPDATE assets
+    SET status = 'ready',
+        processing_error = NULL,
+        original_object_key = @originalObjectKey,
+        original_content_type = @originalContentType,
+        original_byte_size = @originalByteSize,
+        original_width = @originalWidth,
+        original_height = @originalHeight,
+        display_object_key = @displayObjectKey,
+        display_sha256 = @displaySha256,
+        display_content_type = @displayContentType,
+        display_byte_size = @displayByteSize,
+        display_width = @displayWidth,
+        display_height = @displayHeight,
+        thumbnail_object_key = @thumbnailObjectKey,
+        thumbnail_sha256 = @thumbnailSha256,
+        thumbnail_content_type = @thumbnailContentType,
+        thumbnail_byte_size = @thumbnailByteSize,
+        thumbnail_width = @thumbnailWidth,
+        thumbnail_height = @thumbnailHeight,
+        updated_at = @updatedAt
+    WHERE id = @id AND status = 'processing'
+  `);
+  const markFailed = database.prepare(`
+    UPDATE assets
+    SET status = 'failed',
+        processing_error = @processingError,
+        original_object_key = @originalObjectKey,
+        original_content_type = @originalContentType,
+        original_byte_size = @originalByteSize,
+        original_width = @originalWidth,
+        original_height = @originalHeight,
+        display_object_key = @displayObjectKey,
+        display_sha256 = @displaySha256,
+        display_content_type = @displayContentType,
+        display_byte_size = @displayByteSize,
+        display_width = @displayWidth,
+        display_height = @displayHeight,
+        thumbnail_object_key = @thumbnailObjectKey,
+        thumbnail_sha256 = @thumbnailSha256,
+        thumbnail_content_type = @thumbnailContentType,
+        thumbnail_byte_size = @thumbnailByteSize,
+        thumbnail_width = @thumbnailWidth,
+        thumbnail_height = @thumbnailHeight,
+        updated_at = @updatedAt
+    WHERE id = @id AND status = 'processing'
+  `);
+  const updateEditable = database.prepare(`
+    UPDATE assets
+    SET display_name = @displayName,
+        expiration_at = @expirationAt,
+        updated_at = @updatedAt
+    WHERE id = @id AND status != 'deleting'
+  `);
+  const playlistReferences = database.prepare(`
+    SELECT
+      pe.id AS entry_id,
+      pe.playlist_id,
+      p.name AS playlist_name,
+      pe.enabled,
+      pe.position,
+      EXISTS (
+        SELECT 1 FROM playback_state active
+        WHERE active.active_playlist_id = pe.playlist_id
+      ) AS is_active_playlist,
+      EXISTS (
+        SELECT 1 FROM playback_state current
+        WHERE current.current_entry_id = pe.id
+      ) AS is_current_normal_target
+    FROM playlist_entries pe
+    JOIN playlists p ON p.id = pe.playlist_id
+    WHERE pe.asset_id = ?
+    ORDER BY p.name COLLATE NOCASE, pe.position, pe.id
+  `);
+  const playbackReferences = database.prepare(`
+    SELECT
+      output_id,
+      mode,
+      active_playlist_id,
+      current_entry_id,
+      static_asset_id
+    FROM playback_state
+    WHERE static_asset_id = ?
+       OR current_entry_id IN (
+         SELECT id FROM playlist_entries WHERE asset_id = ?
+       )
+    ORDER BY output_id
+  `);
+  const markDeleting = database.prepare(`
+    UPDATE assets
+    SET status = 'deleting', updated_at = ?
+    WHERE id = ? AND status != 'processing'
+  `);
+  const deleteAssetRow = database.prepare(
+    "DELETE FROM assets WHERE id = ? AND status = 'deleting'",
+  );
+
+  const completeAsset = database.transaction((metadata) => {
+    const result = markReady.run(metadata);
+    if (result.changes !== 1) {
+      throw new Error("Asset processing state changed before completion");
+    }
+    return findById.get(metadata.id);
+  });
+
+  function getRaw(assetId) {
+    const row = findById.get(assetId);
+    if (!row) throw assetNotFound(assetId);
+    return row;
+  }
+
+  function duplicateStateError(row) {
+    if (row.status === "failed") {
+      return new AssetError(
+        "ASSET_PROCESSING_FAILED",
+        "These bytes match an asset whose processing previously failed",
+        { statusCode: 409, details: { asset: mapAsset(row) } },
+      );
+    }
+    if (row.status === "deleting") {
+      return new AssetError(
+        "ASSET_DELETING",
+        "These bytes match an asset that is being deleted",
+        { statusCode: 409, details: { assetId: row.id } },
+      );
+    }
+    return new AssetError(
+      "ASSET_PROCESSING",
+      "These bytes are already being processed",
+      { statusCode: 409, details: { assetId: row.id } },
+    );
+  }
+
+  async function resolveExistingHash(row) {
+    if (row.status === "ready") {
+      return { created: false, duplicate: true, asset: mapAsset(row) };
+    }
+    if (row.status !== "processing") {
+      throw duplicateStateError(row);
+    }
+
+    const deadline = Date.now() + concurrentUploadWaitMs;
+    while (Date.now() < deadline) {
+      await wait(CONCURRENT_UPLOAD_POLL_MS);
+      const latest = findByHash.get(row.source_sha256);
+      if (!latest) break;
+      if (latest.status === "ready") {
+        return { created: false, duplicate: true, asset: mapAsset(latest) };
+      }
+      if (latest.status !== "processing") {
+        throw duplicateStateError(latest);
+      }
+    }
+    throw duplicateStateError(findByHash.get(row.source_sha256) || row);
+  }
+
+  function nameConflict(displayName, row = findByName.get(displayName)) {
+    return new AssetError(
+      "ASSET_NAME_CONFLICT",
+      "Another library asset already uses that display name",
+      {
+        statusCode: 409,
+        details: row ? { asset: mapAsset(row) } : { displayName },
+      },
+    );
+  }
+
+  function processingMetadata(id, processed, keys, error) {
+    return {
+      id,
+      processingError: error ? boundedProcessingError(error) : null,
+      originalObjectKey: keys.original,
+      originalContentType: processed.original.contentType,
+      originalByteSize: processed.original.byteSize,
+      originalWidth: processed.original.width,
+      originalHeight: processed.original.height,
+      displayObjectKey: keys.display,
+      displaySha256: processed.display.sha256,
+      displayContentType: processed.display.contentType,
+      displayByteSize: processed.display.byteSize,
+      displayWidth: processed.display.width,
+      displayHeight: processed.display.height,
+      thumbnailObjectKey: keys.thumbnail,
+      thumbnailSha256: processed.thumbnail.sha256,
+      thumbnailContentType: processed.thumbnail.contentType,
+      thumbnailByteSize: processed.thumbnail.byteSize,
+      thumbnailWidth: processed.thumbnail.width,
+      thumbnailHeight: processed.thumbnail.height,
+      updatedAt: now(),
+    };
+  }
+
+  async function cleanObjects(keys) {
+    const results = await Promise.allSettled(
+      [...new Set(Object.values(keys).filter(Boolean))].map((key) =>
+        storage.deleteObject(key),
+      ),
+    );
+    const rejected = results.find((result) => result.status === "rejected");
+    if (rejected) throw rejected.reason;
+  }
+
+  async function createProcessedAsset(plan) {
+    const id = createId();
+    const timestamp = now();
+    try {
+      insertProcessing.run({
+        id,
+        sourceSha256: plan.sourceSha256,
+        displayName: plan.displayName,
+        originalFilename: plan.file.originalFilename,
+        createdAt: timestamp,
+        updatedAt: timestamp,
+      });
+    } catch (error) {
+      const hashMatch = findByHash.get(plan.sourceSha256);
+      if (hashMatch) return resolveExistingHash(hashMatch);
+      const nameMatch = findByName.get(plan.displayName);
+      if (nameMatch) throw nameConflict(plan.displayName, nameMatch);
+      throw error;
+    }
+
+    const keys = objectKeys(id, plan.processed);
+    try {
+      await storage.putObject({
+        key: keys.original,
+        body: fs.createReadStream(plan.file.path),
+        contentType: plan.processed.original.contentType,
+        contentLength: plan.processed.original.byteSize,
+        metadata: { sha256: plan.processed.original.sha256 },
+      });
+      await storage.putObject({
+        key: keys.display,
+        body: plan.processed.display.buffer,
+        contentType: plan.processed.display.contentType,
+        contentLength: plan.processed.display.byteSize,
+        metadata: { sha256: plan.processed.display.sha256 },
+      });
+      await storage.putObject({
+        key: keys.thumbnail,
+        body: plan.processed.thumbnail.buffer,
+        contentType: plan.processed.thumbnail.contentType,
+        contentLength: plan.processed.thumbnail.byteSize,
+        metadata: { sha256: plan.processed.thumbnail.sha256 },
+      });
+
+      const row = completeAsset(processingMetadata(id, plan.processed, keys));
+      return { created: true, duplicate: false, asset: mapAsset(row) };
+    } catch (error) {
+      const failure = processingMetadata(id, plan.processed, keys, error);
+      try {
+        markFailed.run(failure);
+      } catch {
+        // Preserve the original failure; the processing row remains diagnosable.
+      }
+      try {
+        await cleanObjects(keys);
+      } catch {
+        // The failed row retains deterministic keys so DELETE can retry cleanup.
+      }
+
+      if (error?.statusCode) {
+        error.details = { ...(error.details || {}), assetId: id, retryable: true };
+      }
+      throw error;
+    }
+  }
+
+  async function upload(files, { displayName = null } = {}) {
+    if (!Array.isArray(files) || files.length === 0) {
+      throw new AssetError(
+        "UPLOAD_FILE_REQUIRED",
+        "At least one image file is required",
+      );
+    }
+
+    const plans = [];
+    const firstPlanByHash = new Map();
+    const plannedNames = new Map();
+
+    for (const [index, file] of files.entries()) {
+      const identity = await hashFile(file.path);
+      if (identity.byteSize !== file.byteSize) {
+        throw new AssetError(
+          "UPLOAD_CHANGED_DURING_PROCESSING",
+          "An uploaded temporary file changed before processing",
+          { statusCode: 409 },
+        );
+      }
+
+      const existing = findByHash.get(identity.sourceSha256);
+      if (existing) {
+        plans.push({ index, existing });
+        continue;
+      }
+
+      const priorPlan = firstPlanByHash.get(identity.sourceSha256);
+      if (priorPlan) {
+        plans.push({ index, duplicateOf: priorPlan });
+        continue;
+      }
+
+      const proposedName = normalizeDisplayName(
+        displayName ?? defaultDisplayName(file.originalFilename),
+      );
+      const existingName = findByName.get(proposedName);
+      if (existingName) throw nameConflict(proposedName, existingName);
+
+      const normalizedNameKey = proposedName.toLowerCase();
+      const batchNameMatch = plannedNames.get(normalizedNameKey);
+      if (batchNameMatch) throw nameConflict(proposedName);
+
+      const plan = {
+        index,
+        file,
+        displayName: proposedName,
+        sourceSha256: identity.sourceSha256,
+      };
+      firstPlanByHash.set(identity.sourceSha256, plan);
+      plannedNames.set(normalizedNameKey, plan);
+      plans.push(plan);
+    }
+
+    // Decode every new image before any database or object-storage mutation.
+    for (const plan of plans) {
+      if (plan.existing || plan.duplicateOf) continue;
+      plan.processed = await imageProcessor.process(plan.file.path);
+      if (plan.processed.original.sha256 !== plan.sourceSha256) {
+        throw new AssetError(
+          "UPLOAD_CHANGED_DURING_PROCESSING",
+          "An uploaded temporary file changed before processing",
+          { statusCode: 409 },
+        );
+      }
+    }
+
+    const resultByPlan = new Map();
+    const results = new Array(files.length);
+    for (const plan of plans) {
+      let result;
+      if (plan.existing) {
+        result = await resolveExistingHash(plan.existing);
+      } else if (plan.duplicateOf) {
+        const originalResult = resultByPlan.get(plan.duplicateOf);
+        result = {
+          created: false,
+          duplicate: true,
+          asset: originalResult.asset,
+        };
+      } else {
+        result = await createProcessedAsset(plan);
+        resultByPlan.set(plan, result);
+      }
+      results[plan.index] = result;
+    }
+    return results;
+  }
+
+  function list() {
+    return listAssets.all().map(mapAsset);
+  }
+
+  function get(assetId) {
+    return mapAsset(getRaw(assetId));
+  }
+
+  function update(assetId, input) {
+    if (input === null || typeof input !== "object" || Array.isArray(input)) {
+      throw new AssetError("INVALID_ASSET_UPDATE", "Asset update must be an object");
+    }
+
+    const allowed = new Set([
+      "displayName",
+      "display_name",
+      "expirationAt",
+      "expiration_at",
+    ]);
+    const unknown = Object.keys(input).filter((key) => !allowed.has(key));
+    if (unknown.length > 0) {
+      throw new AssetError(
+        "INVALID_ASSET_UPDATE",
+        "Asset update contains unsupported fields",
+        { details: { fields: unknown } },
+      );
+    }
+    if (Object.keys(input).length === 0) {
+      throw new AssetError("INVALID_ASSET_UPDATE", "At least one field is required");
+    }
+    if (
+      Object.hasOwn(input, "displayName") &&
+      Object.hasOwn(input, "display_name")
+    ) {
+      throw new AssetError("INVALID_ASSET_UPDATE", "Display name was provided twice");
+    }
+    if (
+      Object.hasOwn(input, "expirationAt") &&
+      Object.hasOwn(input, "expiration_at")
+    ) {
+      throw new AssetError("INVALID_ASSET_UPDATE", "Expiration was provided twice");
+    }
+
+    const current = getRaw(assetId);
+    if (current.status === "deleting") {
+      throw new AssetError("ASSET_DELETING", "Deleting assets cannot be edited", {
+        statusCode: 409,
+        details: { assetId },
+      });
+    }
+    const hasDisplayName =
+      Object.hasOwn(input, "displayName") || Object.hasOwn(input, "display_name");
+    const hasExpiration =
+      Object.hasOwn(input, "expirationAt") || Object.hasOwn(input, "expiration_at");
+    const nextDisplayName = hasDisplayName
+      ? normalizeDisplayName(
+          Object.hasOwn(input, "displayName")
+            ? input.displayName
+            : input.display_name,
+        )
+      : current.display_name;
+    const nextExpiration = hasExpiration
+      ? normalizeExpiration(
+          Object.hasOwn(input, "expirationAt")
+            ? input.expirationAt
+            : input.expiration_at,
+        )
+      : current.expiration_at;
+
+    if (
+      nextDisplayName === current.display_name &&
+      nextExpiration === current.expiration_at
+    ) {
+      return mapAsset(current);
+    }
+
+    try {
+      const result = updateEditable.run({
+        id: assetId,
+        displayName: nextDisplayName,
+        expirationAt: nextExpiration,
+        updatedAt: Math.max(now(), current.updated_at + 1),
+      });
+      if (result.changes !== 1) {
+        throw new AssetError("ASSET_DELETING", "Deleting assets cannot be edited", {
+          statusCode: 409,
+          details: { assetId },
+        });
+      }
+    } catch (error) {
+      const nameMatch = findByName.get(nextDisplayName);
+      if (nameMatch && nameMatch.id !== assetId) {
+        throw nameConflict(nextDisplayName, nameMatch);
+      }
+      throw error;
+    }
+    return mapAsset(getRaw(assetId));
+  }
+
+  function references(assetId) {
+    const asset = getRaw(assetId);
+    const playlists = playlistReferences.all(assetId).map((row) => ({
+      playlistId: row.playlist_id,
+      playlistName: row.playlist_name,
+      playlistEntryId: row.entry_id,
+      enabled: Boolean(row.enabled),
+      position: row.position,
+      isActivePlaylist: Boolean(row.is_active_playlist),
+      isCurrentNormalTarget: Boolean(row.is_current_normal_target),
+    }));
+    const playback = playbackReferences.all(assetId, assetId).map((row) => ({
+      outputId: row.output_id,
+      mode: row.mode,
+      activePlaylistId: row.active_playlist_id,
+      currentPlaylistEntryId: row.current_entry_id,
+      isCurrentNormalTarget: playlists.some(
+        (entry) => entry.playlistEntryId === row.current_entry_id,
+      ),
+      isCurrentStaticTarget: row.static_asset_id === assetId,
+    }));
+    const currentNormalTarget = playback.some((state) => state.isCurrentNormalTarget);
+    const currentStaticTarget = playback.some((state) => state.isCurrentStaticTarget);
+    const blockerCodes = [];
+    if (playlists.length > 0) blockerCodes.push("PLAYLIST_REFERENCES");
+    if (currentNormalTarget) blockerCodes.push("CURRENT_PLAYBACK_TARGET");
+    if (currentStaticTarget) blockerCodes.push("CURRENT_STATIC_TARGET");
+    if (asset.status === "processing") blockerCodes.push("ASSET_PROCESSING");
+    if (asset.status === "deleting") blockerCodes.push("ASSET_DELETING");
+
+    return {
+      assetId,
+      playlists,
+      playback,
+      currentNormalTarget,
+      currentStaticTarget,
+      canDelete: blockerCodes.length === 0,
+      blockerCodes,
+    };
+  }
+
+  const beginDelete = database.transaction((assetId) => {
+    const asset = getRaw(assetId);
+    const referenceInfo = references(assetId);
+    const relationshipBlockers = referenceInfo.blockerCodes.filter((code) =>
+      [
+        "PLAYLIST_REFERENCES",
+        "CURRENT_PLAYBACK_TARGET",
+        "CURRENT_STATIC_TARGET",
+      ].includes(code),
+    );
+    if (relationshipBlockers.length > 0) {
+      throw new AssetError(
+        referenceInfo.playlists.length > 0 ? "ASSET_REFERENCED" : "ASSET_IN_USE",
+        "The library asset is still referenced and cannot be deleted",
+        {
+          statusCode: 409,
+          details: { ...referenceInfo, blockerCodes: relationshipBlockers },
+        },
+      );
+    }
+    if (asset.status === "processing") {
+      throw new AssetError(
+        "ASSET_PROCESSING",
+        "An asset cannot be deleted while it is processing",
+        { statusCode: 409, details: { assetId } },
+      );
+    }
+    if (asset.status !== "deleting") {
+      markDeleting.run(Math.max(now(), asset.updated_at + 1), assetId);
+    }
+    return findById.get(assetId);
+  });
+
+  async function remove(assetId) {
+    const deleting = beginDelete(assetId);
+    const keys = {
+      original: deleting.original_object_key,
+      display: deleting.display_object_key,
+      thumbnail: deleting.thumbnail_object_key,
+    };
+
+    try {
+      await cleanObjects(keys);
+    } catch (error) {
+      if (error?.statusCode) {
+        error.details = { ...(error.details || {}), assetId, retryable: true };
+      }
+      throw error;
+    }
+
+    try {
+      const result = deleteAssetRow.run(assetId);
+      if (result.changes !== 1) throw assetNotFound(assetId);
+    } catch (error) {
+      if (error?.code?.startsWith?.("SQLITE_CONSTRAINT")) {
+        throw new AssetError(
+          "ASSET_REFERENCED",
+          "The library asset became referenced before deletion completed",
+          { statusCode: 409, details: { assetId, retryable: true } },
+        );
+      }
+      throw error;
+    }
+    return { id: assetId, deleted: true };
+  }
+
+  function mediaDescriptor(assetId, kind, requestedHash) {
+    if (!SHA256_PATTERN.test(requestedHash)) {
+      throw new AssetError("MEDIA_NOT_FOUND", "Asset media version not found", {
+        statusCode: 404,
+      });
+    }
+    const asset = getRaw(assetId);
+    const fields =
+      kind === "display"
+        ? {
+            hash: asset.display_sha256,
+            key: asset.display_object_key,
+            contentType: asset.display_content_type,
+            contentLength: asset.display_byte_size,
+          }
+        : {
+            hash: asset.thumbnail_sha256,
+            key: asset.thumbnail_object_key,
+            contentType: asset.thumbnail_content_type,
+            contentLength: asset.thumbnail_byte_size,
+          };
+    if (asset.status !== "ready" || fields.hash !== requestedHash || !fields.key) {
+      throw new AssetError("MEDIA_NOT_FOUND", "Asset media version not found", {
+        statusCode: 404,
+      });
+    }
+    return { asset, kind, ...fields };
+  }
+
+  function originalDescriptor(assetId) {
+    const asset = getRaw(assetId);
+    if (asset.status !== "ready" || !asset.original_object_key) {
+      throw new AssetError("ASSET_ORIGINAL_NOT_READY", "Asset original is not ready", {
+        statusCode: 409,
+        details: { assetId, status: asset.status },
+      });
+    }
+    return {
+      asset,
+      key: asset.original_object_key,
+      hash: asset.source_sha256,
+      contentType: asset.original_content_type,
+      contentLength: asset.original_byte_size,
+    };
+  }
+
+  async function readStoredObject(descriptor) {
+    try {
+      return await storage.getObject(descriptor.key);
+    } catch (error) {
+      if (error instanceof StorageObjectNotFoundError) {
+        throw new AssetError(
+          "STORAGE_INCONSISTENCY",
+          "Asset metadata exists but its stored bytes are unavailable",
+          {
+            statusCode: 503,
+            details: { assetId: descriptor.asset.id, retryable: true },
+            cause: error,
+          },
+        );
+      }
+      throw error;
+    }
+  }
+
+  return Object.freeze({
+    list,
+    get,
+    upload,
+    update,
+    references,
+    remove,
+    mediaDescriptor,
+    originalDescriptor,
+    readStoredObject,
+  });
+}
+
+module.exports = {
+  createAssetService,
+  defaultDisplayName,
+  mapAsset,
+  normalizeDisplayName,
+  normalizeExpiration,
+};

server/src/assets/streaming.js

@@ -0,0 +1,66 @@
+const { Readable } = require("node:stream");
+const { pipeline } = require("node:stream/promises");
+const { AssetError } = require("./errors");
+
+function readableBody(body) {
+  if (body && typeof body.pipe === "function") return body;
+  if (Buffer.isBuffer(body) || body instanceof Uint8Array) {
+    return Readable.from([body]);
+  }
+  if (body && typeof body.getReader === "function") {
+    return Readable.fromWeb(body);
+  }
+  throw new AssetError(
+    "STORAGE_INCONSISTENCY",
+    "Stored asset bytes could not be streamed",
+    { statusCode: 503 },
+  );
+}
+
+function validateDescriptor(descriptor) {
+  if (
+    typeof descriptor.contentType !== "string" ||
+    !Number.isSafeInteger(descriptor.contentLength) ||
+    descriptor.contentLength < 0
+  ) {
+    throw new AssetError(
+      "STORAGE_INCONSISTENCY",
+      "Stored asset metadata is incomplete",
+      { statusCode: 503 },
+    );
+  }
+}
+
+function setCommonHeaders(response, descriptor) {
+  response.set("Content-Type", descriptor.contentType);
+  response.set("Content-Length", String(descriptor.contentLength));
+  response.set("X-Content-Type-Options", "nosniff");
+}
+
+async function storedBody(assetService, descriptor) {
+  const stored = await assetService.readStoredObject(descriptor);
+  return readableBody(stored.body);
+}
+
+async function sendImmutableMedia(assetService, response, descriptor) {
+  validateDescriptor(descriptor);
+  const body = await storedBody(assetService, descriptor);
+  setCommonHeaders(response, descriptor);
+  response.set("Cache-Control", "public, max-age=31536000, immutable");
+  response.set("ETag", `"${descriptor.hash}"`);
+  await pipeline(body, response);
+}
+
+async function sendOriginal(assetService, response, descriptor) {
+  validateDescriptor(descriptor);
+  const body = await storedBody(assetService, descriptor);
+  response.attachment(descriptor.asset.original_filename);
+  setCommonHeaders(response, descriptor);
+  response.set("Cache-Control", "private, no-store");
+  await pipeline(body, response);
+}
+
+module.exports = {
+  sendImmutableMedia,
+  sendOriginal,
+};

server/src/config/index.js

@@ -0,0 +1,256 @@
+const path = require("node:path");
+
+class ConfigError extends Error {
+  constructor(message, field) {
+    super(message);
+    this.name = "ConfigError";
+    this.field = field;
+  }
+}
+
+function requiredString(env, name) {
+  const value = env[name]?.trim();
+  if (!value) {
+    throw new ConfigError(`${name} is required`, name);
+  }
+  return value;
+}
+
+function optionalString(env, name) {
+  const value = env[name]?.trim();
+  return value || null;
+}
+
+function integer(env, name, defaultValue, { min, max } = {}) {
+  const raw = env[name];
+  if (raw === undefined || raw === "") {
+    return defaultValue;
+  }
+
+  if (!/^-?\d+$/.test(raw)) {
+    throw new ConfigError(`${name} must be an integer`, name);
+  }
+
+  const value = Number(raw);
+  if (!Number.isSafeInteger(value)) {
+    throw new ConfigError(`${name} must be a safe integer`, name);
+  }
+  if (min !== undefined && value < min) {
+    throw new ConfigError(`${name} must be at least ${min}`, name);
+  }
+  if (max !== undefined && value > max) {
+    throw new ConfigError(`${name} must be at most ${max}`, name);
+  }
+  return value;
+}
+
+function boolean(env, name, defaultValue) {
+  const raw = env[name];
+  if (raw === undefined || raw === "") {
+    return defaultValue;
+  }
+
+  const normalized = raw.trim().toLowerCase();
+  if (["true", "1", "yes", "on"].includes(normalized)) {
+    return true;
+  }
+  if (["false", "0", "no", "off"].includes(normalized)) {
+    return false;
+  }
+  throw new ConfigError(`${name} must be a boolean`, name);
+}
+
+function url(env, name, { required = false, protocols } = {}) {
+  const raw = required ? requiredString(env, name) : optionalString(env, name);
+  if (raw === null) {
+    return null;
+  }
+
+  let parsed;
+  try {
+    parsed = new URL(raw);
+  } catch {
+    throw new ConfigError(`${name} must be a valid URL`, name);
+  }
+
+  if (protocols && !protocols.includes(parsed.protocol)) {
+    throw new ConfigError(
+      `${name} must use one of these protocols: ${protocols.join(", ")}`,
+      name,
+    );
+  }
+  return parsed.toString().replace(/\/$/, "");
+}
+
+function bucketName(env) {
+  const value = requiredString(env, "S3_BUCKET");
+  if (!/^[a-z0-9][a-z0-9.-]{1,61}[a-z0-9]$/.test(value)) {
+    throw new ConfigError(
+      "S3_BUCKET must be a valid lowercase S3 bucket name",
+      "S3_BUCKET",
+    );
+  }
+  return value;
+}
+
+function nodeEnvironment(env) {
+  const value = env.NODE_ENV?.trim() || "development";
+  if (!["development", "test", "production"].includes(value)) {
+    throw new ConfigError(
+      "NODE_ENV must be development, test, or production",
+      "NODE_ENV",
+    );
+  }
+  return value;
+}
+
+function timeZone(env) {
+  const value = requiredString(env, "APP_TIMEZONE");
+  try {
+    new Intl.DateTimeFormat("en-US", { timeZone: value }).format();
+  } catch {
+    throw new ConfigError("APP_TIMEZONE must be a valid IANA time zone", "APP_TIMEZONE");
+  }
+  return value;
+}
+
+function storageCredential(env, name, environment) {
+  const value = optionalString(env, name);
+  if (environment === "production" && value === null) {
+    throw new ConfigError(`${name} is required in production`, name);
+  }
+  return value;
+}
+
+function loadConfig(env = process.env) {
+  const environment = nodeEnvironment(env);
+  const databasePath = requiredString(env, "DATABASE_PATH");
+  if (databasePath !== ":memory:" && !path.isAbsolute(databasePath)) {
+    throw new ConfigError("DATABASE_PATH must be an absolute path", "DATABASE_PATH");
+  }
+
+  return Object.freeze({
+    environment,
+    host: env.HOST?.trim() || "0.0.0.0",
+    port: integer(env, "PORT", 7532, { min: 0, max: 65535 }),
+    timeZone: timeZone(env),
+    shutdownTimeoutMs: integer(env, "SHUTDOWN_TIMEOUT_MS", 10_000, {
+      min: 1_000,
+      max: 60_000,
+    }),
+    trustProxy: boolean(env, "TRUST_PROXY", true),
+    database: Object.freeze({
+      path: databasePath,
+      busyTimeoutMs: integer(env, "DATABASE_BUSY_TIMEOUT_MS", 5_000, {
+        min: 0,
+        max: 60_000,
+      }),
+    }),
+    storage: Object.freeze({
+      endpoint: url(env, "S3_ENDPOINT", {
+        required: true,
+        protocols: ["http:", "https:"],
+      }),
+      region: env.S3_REGION?.trim() || "us-east-1",
+      bucket: bucketName(env),
+      accessKeyId: storageCredential(env, "S3_ACCESS_KEY_ID", environment),
+      secretAccessKey: storageCredential(env, "S3_SECRET_ACCESS_KEY", environment),
+      forcePathStyle: boolean(env, "S3_FORCE_PATH_STYLE", true),
+      healthProbeIntervalMs: integer(
+        env,
+        "S3_HEALTH_PROBE_INTERVAL_MS",
+        30_000,
+        { min: 1_000, max: 300_000 },
+      ),
+      connectionTimeoutMs: integer(env, "S3_CONNECT_TIMEOUT_MS", 2_000, {
+        min: 250,
+        max: 60_000,
+      }),
+      requestTimeoutMs: integer(env, "S3_REQUEST_TIMEOUT_MS", 5_000, {
+        min: 1_000,
+        max: 120_000,
+      }),
+      maxAttempts: integer(env, "S3_MAX_ATTEMPTS", 2, { min: 1, max: 5 }),
+    }),
+    processing: Object.freeze({
+      tempDirectory: (() => {
+        const value = env.UPLOAD_TEMP_DIRECTORY?.trim() || "/tmp/announcements-uploads";
+        if (!path.isAbsolute(value)) {
+          throw new ConfigError(
+            "UPLOAD_TEMP_DIRECTORY must be an absolute path",
+            "UPLOAD_TEMP_DIRECTORY",
+          );
+        }
+        return value;
+      })(),
+      maxFileBytes: integer(env, "UPLOAD_MAX_FILE_BYTES", 25 * 1024 * 1024, {
+        min: 1,
+        max: 1024 * 1024 * 1024,
+      }),
+      maxFiles: integer(env, "UPLOAD_MAX_FILES", 20, { min: 1, max: 100 }),
+      maxInputPixels: integer(env, "IMAGE_MAX_INPUT_PIXELS", 40_000_000, {
+        min: 1,
+        max: 500_000_000,
+      }),
+    }),
+    mqtt: Object.freeze({
+      url: url(env, "MQTT_URL", {
+        protocols: ["mqtt:", "mqtts:", "ws:", "wss:"],
+      }),
+      username: optionalString(env, "MQTT_USERNAME"),
+      password: optionalString(env, "MQTT_PASSWORD"),
+    }),
+    notifications: Object.freeze({
+      homeAssistantWebhookUrl: url(env, "HA_WEBHOOK_URL", {
+        protocols: ["http:", "https:"],
+      }),
+      homeAssistantWebhookSecret: optionalString(env, "HA_WEBHOOK_SECRET"),
+    }),
+  });
+}
+
+function redactedConfig(config) {
+  return {
+    environment: config.environment,
+    host: config.host,
+    port: config.port,
+    timeZone: config.timeZone,
+    trustProxy: config.trustProxy,
+    database: {
+      configured: Boolean(config.database.path),
+    },
+    storage: {
+      configured: Boolean(
+        config.storage.endpoint &&
+          config.storage.bucket &&
+          config.storage.accessKeyId &&
+          config.storage.secretAccessKey,
+      ),
+      region: config.storage.region,
+      bucket: config.storage.bucket,
+      forcePathStyle: config.storage.forcePathStyle,
+      healthProbeIntervalMs: config.storage.healthProbeIntervalMs,
+      connectionTimeoutMs: config.storage.connectionTimeoutMs,
+      requestTimeoutMs: config.storage.requestTimeoutMs,
+      maxAttempts: config.storage.maxAttempts,
+    },
+    processing: {
+      tempDirectoryConfigured: Boolean(config.processing.tempDirectory),
+      maxFileBytes: config.processing.maxFileBytes,
+      maxFiles: config.processing.maxFiles,
+      maxInputPixels: config.processing.maxInputPixels,
+    },
+    mqtt: {
+      configured: Boolean(config.mqtt.url),
+    },
+    notifications: {
+      configured: Boolean(config.notifications.homeAssistantWebhookUrl),
+    },
+  };
+}
+
+module.exports = {
+  ConfigError,
+  loadConfig,
+  redactedConfig,
+};

server/src/database/index.js

@@ -0,0 +1,32 @@
+const fs = require("node:fs");
+const path = require("node:path");
+const Database = require("better-sqlite3");
+
+function openDatabase({ path: filename, busyTimeoutMs = 5_000 }) {
+  if (filename !== ":memory:") {
+    fs.mkdirSync(path.dirname(filename), { recursive: true });
+  }
+
+  const database = new Database(filename, {
+    timeout: busyTimeoutMs,
+  });
+
+  database.pragma("foreign_keys = ON");
+  database.pragma(`busy_timeout = ${busyTimeoutMs}`);
+  if (filename !== ":memory:") {
+    database.pragma("journal_mode = WAL");
+    database.pragma("synchronous = NORMAL");
+  }
+
+  return database;
+}
+
+function checkDatabase(database) {
+  database.prepare("SELECT 1 AS ok").get();
+  return true;
+}
+
+module.exports = {
+  checkDatabase,
+  openDatabase,
+};

server/src/database/migrate.js

@@ -0,0 +1,122 @@
+const fs = require("node:fs");
+const path = require("node:path");
+
+const DEFAULT_MIGRATIONS_DIRECTORY = path.join(__dirname, "migrations");
+const MIGRATION_FILENAME = /^(\d+)_([a-z0-9_-]+)\.sql$/i;
+
+function discoverMigrations(directory = DEFAULT_MIGRATIONS_DIRECTORY) {
+  const migrations = fs
+    .readdirSync(directory, { withFileTypes: true })
+    .filter((entry) => entry.isFile() && entry.name.endsWith(".sql"))
+    .map((entry) => {
+      const match = MIGRATION_FILENAME.exec(entry.name);
+      if (!match) {
+        throw new Error(`Invalid migration filename: ${entry.name}`);
+      }
+      return {
+        version: Number(match[1]),
+        name: match[2],
+        filename: entry.name,
+        sql: fs.readFileSync(path.join(directory, entry.name), "utf8"),
+      };
+    })
+    .sort((left, right) => left.version - right.version);
+
+  const versions = new Set();
+  for (const migration of migrations) {
+    if (!Number.isSafeInteger(migration.version) || migration.version < 1) {
+      throw new Error(`Invalid migration version: ${migration.filename}`);
+    }
+    if (versions.has(migration.version)) {
+      throw new Error(`Duplicate migration version: ${migration.version}`);
+    }
+    versions.add(migration.version);
+  }
+
+  return migrations;
+}
+
+function ensureMigrationsTable(database) {
+  database.exec(`
+    CREATE TABLE IF NOT EXISTS schema_migrations (
+      version INTEGER PRIMARY KEY,
+      name TEXT NOT NULL,
+      applied_at INTEGER NOT NULL
+    )
+  `);
+}
+
+function readAppliedMigrations(database) {
+  return database
+    .prepare(
+      `SELECT version, name, applied_at AS appliedAt
+       FROM schema_migrations
+       ORDER BY version`,
+    )
+    .all();
+}
+
+function migrationStatus(database, directory = DEFAULT_MIGRATIONS_DIRECTORY) {
+  ensureMigrationsTable(database);
+  const available = discoverMigrations(directory);
+  const applied = readAppliedMigrations(database);
+  const appliedVersions = new Set(applied.map((migration) => migration.version));
+
+  return {
+    currentVersion: applied.at(-1)?.version ?? 0,
+    latestAvailableVersion: available.at(-1)?.version ?? 0,
+    pendingVersions: available
+      .filter((migration) => !appliedVersions.has(migration.version))
+      .map((migration) => migration.version),
+    applied,
+  };
+}
+
+function runMigrations(database, directory = DEFAULT_MIGRATIONS_DIRECTORY) {
+  ensureMigrationsTable(database);
+  const migrations = discoverMigrations(directory);
+  const applied = new Map(
+    readAppliedMigrations(database).map((migration) => [
+      migration.version,
+      migration.name,
+    ]),
+  );
+  const availableVersions = new Set(migrations.map((migration) => migration.version));
+
+  for (const [version] of applied) {
+    if (!availableVersions.has(version)) {
+      throw new Error(`Database contains unknown migration version ${version}`);
+    }
+  }
+
+  const insertMigration = database.prepare(
+    `INSERT INTO schema_migrations (version, name, applied_at)
+     VALUES (?, ?, ?)`,
+  );
+  const applyMigration = database.transaction((migration) => {
+    database.exec(migration.sql);
+    insertMigration.run(migration.version, migration.name, Date.now());
+  });
+
+  for (const migration of migrations) {
+    const appliedName = applied.get(migration.version);
+    if (appliedName !== undefined) {
+      if (appliedName !== migration.name) {
+        throw new Error(
+          `Migration ${migration.version} was applied as ${appliedName}, not ${migration.name}`,
+        );
+      }
+      continue;
+    }
+    applyMigration(migration);
+  }
+
+  return migrationStatus(database, directory);
+}
+
+module.exports = {
+  DEFAULT_MIGRATIONS_DIRECTORY,
+  discoverMigrations,
+  migrationStatus,
+  runMigrations,
+};

server/src/database/migrations/001_initial.sql

@@ -0,0 +1,214 @@
+CREATE TABLE assets (
+  id TEXT PRIMARY KEY,
+  source_sha256 TEXT NOT NULL UNIQUE
+    CHECK (length(source_sha256) = 64),
+  display_name TEXT NOT NULL COLLATE NOCASE UNIQUE
+    CHECK (length(trim(display_name)) > 0),
+  original_filename TEXT NOT NULL
+    CHECK (length(trim(original_filename)) > 0),
+  status TEXT NOT NULL
+    CHECK (status IN ('processing', 'ready', 'failed', 'deleting')),
+  processing_error TEXT,
+  expiration_at INTEGER,
+
+  original_object_key TEXT,
+  original_content_type TEXT,
+  original_byte_size INTEGER CHECK (original_byte_size IS NULL OR original_byte_size >= 0),
+  original_width INTEGER CHECK (original_width IS NULL OR original_width > 0),
+  original_height INTEGER CHECK (original_height IS NULL OR original_height > 0),
+
+  display_object_key TEXT,
+  display_sha256 TEXT CHECK (display_sha256 IS NULL OR length(display_sha256) = 64),
+  display_content_type TEXT,
+  display_byte_size INTEGER CHECK (display_byte_size IS NULL OR display_byte_size >= 0),
+  display_width INTEGER CHECK (display_width IS NULL OR display_width > 0),
+  display_height INTEGER CHECK (display_height IS NULL OR display_height > 0),
+
+  thumbnail_object_key TEXT,
+  thumbnail_sha256 TEXT CHECK (thumbnail_sha256 IS NULL OR length(thumbnail_sha256) = 64),
+  thumbnail_content_type TEXT,
+  thumbnail_byte_size INTEGER CHECK (thumbnail_byte_size IS NULL OR thumbnail_byte_size >= 0),
+  thumbnail_width INTEGER CHECK (thumbnail_width IS NULL OR thumbnail_width > 0),
+  thumbnail_height INTEGER CHECK (thumbnail_height IS NULL OR thumbnail_height > 0),
+
+  created_at INTEGER NOT NULL,
+  updated_at INTEGER NOT NULL
+);
+
+CREATE INDEX assets_lifecycle_idx ON assets (status, expiration_at);
+
+CREATE TABLE playlists (
+  id TEXT PRIMARY KEY,
+  name TEXT NOT NULL COLLATE NOCASE UNIQUE
+    CHECK (length(trim(name)) > 0),
+  revision INTEGER NOT NULL DEFAULT 1 CHECK (revision > 0),
+  created_at INTEGER NOT NULL,
+  updated_at INTEGER NOT NULL
+);
+
+CREATE TABLE playlist_entries (
+  id TEXT PRIMARY KEY,
+  playlist_id TEXT NOT NULL,
+  asset_id TEXT NOT NULL,
+  enabled INTEGER NOT NULL DEFAULT 1 CHECK (enabled IN (0, 1)),
+  duration_override_ms INTEGER
+    CHECK (duration_override_ms IS NULL OR duration_override_ms > 0),
+  background_mode_override TEXT
+    CHECK (
+      background_mode_override IS NULL OR
+      background_mode_override IN ('blurred', 'solid', 'black')
+    ),
+  background_color_override TEXT,
+  background_darkened_override INTEGER
+    CHECK (
+      background_darkened_override IS NULL OR
+      background_darkened_override IN (0, 1)
+    ),
+  schedule_start_at INTEGER,
+  schedule_end_at INTEGER,
+  position INTEGER NOT NULL CHECK (position >= 0),
+  created_at INTEGER NOT NULL,
+  updated_at INTEGER NOT NULL,
+  FOREIGN KEY (playlist_id) REFERENCES playlists(id) ON DELETE CASCADE,
+  FOREIGN KEY (asset_id) REFERENCES assets(id) ON DELETE RESTRICT,
+  UNIQUE (playlist_id, position),
+  UNIQUE (playlist_id, asset_id),
+  CHECK (
+    schedule_start_at IS NULL OR
+    schedule_end_at IS NULL OR
+    schedule_start_at < schedule_end_at
+  )
+);
+
+CREATE INDEX playlist_entries_asset_idx ON playlist_entries (asset_id);
+CREATE INDEX playlist_entries_schedule_idx
+  ON playlist_entries (playlist_id, enabled, schedule_start_at, schedule_end_at);
+
+CREATE TABLE app_settings (
+  id INTEGER PRIMARY KEY CHECK (id = 1),
+  revision INTEGER NOT NULL DEFAULT 1 CHECK (revision > 0),
+  default_duration_ms INTEGER NOT NULL DEFAULT 7000
+    CHECK (default_duration_ms > 0),
+  default_background_mode TEXT NOT NULL DEFAULT 'blurred'
+    CHECK (default_background_mode IN ('blurred', 'solid', 'black')),
+  default_solid_background_color TEXT NOT NULL DEFAULT '#000000'
+    CHECK (length(trim(default_solid_background_color)) > 0),
+  default_background_darkened INTEGER NOT NULL DEFAULT 0
+    CHECK (default_background_darkened IN (0, 1)),
+  default_blur_px INTEGER NOT NULL DEFAULT 20
+    CHECK (default_blur_px >= 0),
+  crossfade_duration_ms INTEGER NOT NULL DEFAULT 1000
+    CHECK (crossfade_duration_ms >= 0),
+  updated_at INTEGER NOT NULL
+);
+
+INSERT INTO app_settings (id, updated_at)
+VALUES (1, CAST(strftime('%s', 'now') AS INTEGER) * 1000);
+
+CREATE TABLE playback_state (
+  output_id TEXT PRIMARY KEY,
+  mode TEXT NOT NULL DEFAULT 'on' CHECK (mode IN ('on', 'off')),
+  active_playlist_id TEXT,
+  pending_playlist_id TEXT,
+  pending_playlist_requested_at INTEGER,
+  current_entry_id TEXT,
+  rotation_paused INTEGER NOT NULL DEFAULT 0 CHECK (rotation_paused IN (0, 1)),
+  paused_remaining_ms INTEGER
+    CHECK (paused_remaining_ms IS NULL OR paused_remaining_ms >= 0),
+  static_asset_id TEXT,
+  slide_started_at INTEGER,
+  next_slide_at INTEGER,
+  revision INTEGER NOT NULL DEFAULT 1 CHECK (revision > 0),
+  updated_at INTEGER NOT NULL,
+  FOREIGN KEY (active_playlist_id) REFERENCES playlists(id) ON DELETE SET NULL,
+  FOREIGN KEY (pending_playlist_id) REFERENCES playlists(id) ON DELETE RESTRICT,
+  FOREIGN KEY (current_entry_id) REFERENCES playlist_entries(id) ON DELETE SET NULL,
+  FOREIGN KEY (static_asset_id) REFERENCES assets(id) ON DELETE SET NULL,
+  CHECK (
+    (pending_playlist_id IS NULL AND pending_playlist_requested_at IS NULL) OR
+    (pending_playlist_id IS NOT NULL AND pending_playlist_requested_at IS NOT NULL)
+  )
+);
+
+INSERT INTO playback_state (output_id, updated_at)
+VALUES ('global', CAST(strftime('%s', 'now') AS INTEGER) * 1000);
+
+CREATE TABLE asset_import_sources (
+  id TEXT PRIMARY KEY,
+  source_system TEXT NOT NULL,
+  source_bucket TEXT NOT NULL,
+  source_key TEXT NOT NULL,
+  source_etag TEXT,
+  source_byte_size INTEGER CHECK (source_byte_size IS NULL OR source_byte_size >= 0),
+  source_sha256 TEXT CHECK (source_sha256 IS NULL OR length(source_sha256) = 64),
+  asset_id TEXT,
+  initial_playlist_entry_id TEXT,
+  status TEXT NOT NULL
+    CHECK (status IN ('pending', 'processing', 'imported', 'failed')),
+  error TEXT,
+  imported_at INTEGER,
+  FOREIGN KEY (asset_id) REFERENCES assets(id) ON DELETE SET NULL,
+  FOREIGN KEY (initial_playlist_entry_id) REFERENCES playlist_entries(id) ON DELETE SET NULL,
+  UNIQUE (source_system, source_bucket, source_key)
+);
+
+CREATE INDEX asset_import_sources_status_idx ON asset_import_sources (status);
+
+CREATE TABLE notification_incidents (
+  id TEXT PRIMARY KEY,
+  condition_key TEXT NOT NULL,
+  episode INTEGER NOT NULL CHECK (episode > 0),
+  event TEXT NOT NULL,
+  severity TEXT NOT NULL,
+  state TEXT NOT NULL CHECK (state IN ('open', 'recovered')),
+  message TEXT NOT NULL,
+  context_json TEXT NOT NULL DEFAULT '{}',
+  opened_at INTEGER NOT NULL,
+  last_observed_at INTEGER NOT NULL,
+  recovered_at INTEGER,
+  UNIQUE (condition_key, episode),
+  CHECK (
+    (state = 'open' AND recovered_at IS NULL) OR
+    (state = 'recovered' AND recovered_at IS NOT NULL)
+  )
+);
+
+CREATE UNIQUE INDEX notification_incidents_one_open_idx
+  ON notification_incidents (condition_key)
+  WHERE state = 'open';
+
+CREATE TABLE notification_outbox (
+  id TEXT PRIMARY KEY,
+  incident_id TEXT NOT NULL,
+  transition TEXT NOT NULL CHECK (transition IN ('failure', 'recovery')),
+  payload_json TEXT NOT NULL,
+  attempt_count INTEGER NOT NULL DEFAULT 0 CHECK (attempt_count >= 0),
+  next_attempt_at INTEGER NOT NULL,
+  delivered_at INTEGER,
+  last_error TEXT,
+  created_at INTEGER NOT NULL,
+  FOREIGN KEY (incident_id) REFERENCES notification_incidents(id) ON DELETE CASCADE,
+  UNIQUE (incident_id, transition)
+);
+
+CREATE INDEX notification_outbox_due_idx
+  ON notification_outbox (next_attempt_at)
+  WHERE delivered_at IS NULL;
+
+CREATE TABLE display_clients (
+  client_id TEXT PRIMARY KEY,
+  output_id TEXT NOT NULL DEFAULT 'global',
+  first_seen_at INTEGER NOT NULL,
+  last_seen_at INTEGER NOT NULL,
+  active_playlist_id TEXT,
+  playlist_revision INTEGER,
+  playback_revision INTEGER,
+  current_entry_id TEXT,
+  current_asset_id TEXT,
+  cached_asset_count INTEGER CHECK (cached_asset_count IS NULL OR cached_asset_count >= 0),
+  playable_asset_count INTEGER CHECK (playable_asset_count IS NULL OR playable_asset_count >= 0),
+  last_error TEXT,
+  updated_at INTEGER NOT NULL
+);
+
+CREATE INDEX display_clients_last_seen_idx ON display_clients (last_seen_at);

server/src/health/routes.js

@@ -0,0 +1,143 @@
+const express = require("express");
+const { checkDatabase } = require("../database");
+const { redactedConfig } = require("../config");
+
+function databaseHealth(database) {
+  try {
+    checkDatabase(database);
+    return { status: "ok" };
+  } catch (error) {
+    return {
+      status: "error",
+      message: "SQLite is unavailable",
+    };
+  }
+}
+
+function storageHealth(storage) {
+  if (!storage) {
+    return {
+      status: "degraded",
+      checkedAt: null,
+      lastSuccessAt: null,
+      code: "STORAGE_NOT_INITIALIZED",
+      message: "Object storage has not been initialized",
+    };
+  }
+
+  try {
+    const result = storage.health();
+    if (result?.status === "healthy") {
+      return {
+        status: "healthy",
+        checkedAt: result.checkedAt || null,
+        lastSuccessAt: result.lastSuccessAt || result.checkedAt || null,
+      };
+    }
+    return {
+      status: "degraded",
+      checkedAt: result?.checkedAt || null,
+      lastSuccessAt: result?.lastSuccessAt || null,
+      code:
+        result?.code === "STORAGE_NOT_CHECKED"
+          ? "STORAGE_NOT_CHECKED"
+          : "STORAGE_UNAVAILABLE",
+      message:
+        result?.code === "STORAGE_NOT_CHECKED"
+          ? "Object storage has not been checked"
+          : "Object storage is unavailable",
+    };
+  } catch {
+    // A health endpoint must remain available when its dependency is not.
+  }
+
+  return {
+    status: "degraded",
+    checkedAt: null,
+    lastSuccessAt: null,
+    code: "STORAGE_UNAVAILABLE",
+    message: "Object storage is unavailable",
+  };
+}
+
+function createHealthRouter({ database, lifecycle, migrations, storage }) {
+  const router = express.Router();
+
+  router.get("/live", (request, response) => {
+    response.json({ status: "ok" });
+  });
+
+  router.get("/ready", async (request, response) => {
+    const databaseCheck = databaseHealth(database);
+    const storageCheck = storageHealth(storage);
+    const migrationsCurrent = migrations.pendingVersions.length === 0;
+    const ready =
+      lifecycle.ready && databaseCheck.status === "ok" && migrationsCurrent;
+
+    response.status(ready ? 200 : 503).json({
+      status: ready ? "ready" : "not_ready",
+      checks: {
+        database: databaseCheck.status,
+        migrations: migrationsCurrent ? "current" : "pending",
+        storage: storageCheck.status,
+      },
+    });
+  });
+
+  return router;
+}
+
+function createDetailedHealthRouter({ config, database, lifecycle, migrations, storage }) {
+  const router = express.Router();
+
+  router.get("/", async (request, response) => {
+    const databaseCheck = databaseHealth(database);
+    const storageCheck = storageHealth(storage);
+    const ready =
+      lifecycle.ready &&
+      databaseCheck.status === "ok" &&
+      migrations.pendingVersions.length === 0;
+
+    const configuration = redactedConfig(config);
+    const status = !ready
+      ? "not_ready"
+      : storageCheck.status === "healthy"
+        ? "ok"
+        : "degraded";
+
+    response.status(ready ? 200 : 503).json({
+      status,
+      configuration,
+      services: {
+        database: {
+          ...databaseCheck,
+          currentSchemaVersion: migrations.currentVersion,
+          latestSchemaVersion: migrations.latestAvailableVersion,
+        },
+        storage: {
+          ...storageCheck,
+          configured: configuration.storage.configured,
+        },
+        mqtt: {
+          status: "not_started",
+          configured: configuration.mqtt.configured,
+        },
+        notifications: {
+          status: "not_started",
+          configured: configuration.notifications.configured,
+        },
+        playback: { status: "not_started" },
+        displays: { status: "not_started" },
+      },
+    });
+  });
+
+  return router;
+}
+
+module.exports = {
+  createDetailedHealthRouter,
+  createHealthRouter,
+  databaseHealth,
+  storageHealth,
+};

server/src/image-processing/index.js

@@ -0,0 +1,330 @@
+const crypto = require("node:crypto");
+const fs = require("node:fs");
+const sharp = require("sharp");
+
+const SUPPORTED_FORMATS = Object.freeze(new Set(["jpeg", "png", "webp"]));
+const CONTENT_TYPES = Object.freeze({
+  jpeg: "image/jpeg",
+  png: "image/png",
+  webp: "image/webp",
+});
+const BLACK = Object.freeze({ r: 0, g: 0, b: 0, alpha: 1 });
+const DEFAULT_IMAGE_DERIVATIVE_OPTIONS = Object.freeze({
+  display: Object.freeze({ maxWidth: 1920, maxHeight: 1080, quality: 82 }),
+  thumbnail: Object.freeze({ maxWidth: 480, maxHeight: 270, quality: 72 }),
+});
+
+class ImageProcessingError extends Error {
+  constructor(code, message, { statusCode = 422, details, cause } = {}) {
+    super(message, cause ? { cause } : undefined);
+    this.name = "ImageProcessingError";
+    this.code = code;
+    this.statusCode = statusCode;
+    if (details !== undefined) {
+      this.details = details;
+    }
+  }
+}
+
+function requireInteger(value, name, { min, max } = {}) {
+  if (!Number.isSafeInteger(value)) {
+    throw new TypeError(`${name} must be an integer`);
+  }
+  if (min !== undefined && value < min) {
+    throw new RangeError(`${name} must be at least ${min}`);
+  }
+  if (max !== undefined && value > max) {
+    throw new RangeError(`${name} must be at most ${max}`);
+  }
+  return value;
+}
+
+function normalizeTargetOptions(target, name, defaults) {
+  if (
+    target !== undefined &&
+    (target === null || typeof target !== "object" || Array.isArray(target))
+  ) {
+    throw new TypeError(`${name} image options must be an object`);
+  }
+
+  const configured = { ...defaults, ...target };
+
+  return Object.freeze({
+    maxWidth: requireInteger(configured.maxWidth, `${name}.maxWidth`, { min: 1 }),
+    maxHeight: requireInteger(configured.maxHeight, `${name}.maxHeight`, { min: 1 }),
+    quality: requireInteger(configured.quality, `${name}.quality`, {
+      min: 1,
+      max: 100,
+    }),
+  });
+}
+
+function normalizeOptions(options) {
+  if (options === null || typeof options !== "object" || Array.isArray(options)) {
+    throw new TypeError("Image processing options are required");
+  }
+
+  return Object.freeze({
+    maxInputPixels: requireInteger(
+      options.maxInputPixels,
+      "maxInputPixels",
+      { min: 1 },
+    ),
+    display: normalizeTargetOptions(
+      options.display,
+      "display",
+      DEFAULT_IMAGE_DERIVATIVE_OPTIONS.display,
+    ),
+    thumbnail: normalizeTargetOptions(
+      options.thumbnail,
+      "thumbnail",
+      DEFAULT_IMAGE_DERIVATIVE_OPTIONS.thumbnail,
+    ),
+  });
+}
+
+function sha256(buffer) {
+  return crypto.createHash("sha256").update(buffer).digest("hex");
+}
+
+async function hashFile(filename) {
+  const hash = crypto.createHash("sha256");
+  let byteSize = 0;
+
+  try {
+    for await (const chunk of fs.createReadStream(filename)) {
+      byteSize += chunk.length;
+      hash.update(chunk);
+    }
+  } catch (error) {
+    throw new ImageProcessingError(
+      "IMAGE_INPUT_UNREADABLE",
+      "The uploaded image could not be read",
+      { statusCode: 422, cause: error },
+    );
+  }
+
+  return { byteSize, sha256: hash.digest("hex") };
+}
+
+async function describeInput(input) {
+  if (Buffer.isBuffer(input)) {
+    return {
+      sharpInput: input,
+      byteSize: input.length,
+      sha256: sha256(input),
+    };
+  }
+
+  if (typeof input !== "string" || input.length === 0) {
+    throw new ImageProcessingError(
+      "INVALID_IMAGE_INPUT",
+      "Image input must be a Buffer or temporary file path",
+      { statusCode: 400 },
+    );
+  }
+
+  let stats;
+  try {
+    stats = await fs.promises.stat(input);
+  } catch (error) {
+    throw new ImageProcessingError(
+      "IMAGE_INPUT_UNREADABLE",
+      "The uploaded image could not be read",
+      { statusCode: 422, cause: error },
+    );
+  }
+
+  if (!stats.isFile()) {
+    throw new ImageProcessingError(
+      "INVALID_IMAGE_INPUT",
+      "Image input path must identify a regular file",
+      { statusCode: 400 },
+    );
+  }
+
+  return {
+    sharpInput: input,
+    ...(await hashFile(input)),
+  };
+}
+
+function decodeError(error, maxInputPixels) {
+  if (error instanceof ImageProcessingError) {
+    return error;
+  }
+
+  if (/pixel limit/i.test(error?.message || "")) {
+    return new ImageProcessingError(
+      "IMAGE_PIXEL_LIMIT_EXCEEDED",
+      "The uploaded image exceeds the configured decoded-pixel limit",
+      {
+        statusCode: 413,
+        details: { maxInputPixels },
+        cause: error,
+      },
+    );
+  }
+
+  return new ImageProcessingError(
+    "MALFORMED_IMAGE",
+    "The uploaded file is not a valid decodable image",
+    { statusCode: 422, cause: error },
+  );
+}
+
+async function readMetadata(input, maxInputPixels) {
+  try {
+    return await sharp(input, {
+      animated: true,
+      failOn: "error",
+      limitInputPixels: maxInputPixels,
+    }).metadata();
+  } catch (error) {
+    throw decodeError(error, maxInputPixels);
+  }
+}
+
+function validateMetadata(metadata) {
+  const pages = metadata.pages ?? 1;
+
+  if (pages > 1) {
+    const hasAnimationTiming =
+      metadata.loop !== undefined ||
+      (Array.isArray(metadata.delay) && metadata.delay.length > 0);
+    throw new ImageProcessingError(
+      hasAnimationTiming
+        ? "ANIMATED_IMAGE_NOT_SUPPORTED"
+        : "MULTIPAGE_IMAGE_NOT_SUPPORTED",
+      hasAnimationTiming
+        ? "Animated images are not supported"
+        : "Multipage images are not supported",
+      { statusCode: 422, details: { pages } },
+    );
+  }
+
+  if (!SUPPORTED_FORMATS.has(metadata.format)) {
+    throw new ImageProcessingError(
+      "UNSUPPORTED_IMAGE_FORMAT",
+      "Only still JPEG, PNG, and WebP images are supported",
+      {
+        statusCode: 415,
+        details: {
+          detectedFormat: metadata.format || null,
+          supportedFormats: [...SUPPORTED_FORMATS],
+        },
+      },
+    );
+  }
+
+  if (
+    !Number.isSafeInteger(metadata.width) ||
+    metadata.width < 1 ||
+    !Number.isSafeInteger(metadata.height) ||
+    metadata.height < 1
+  ) {
+    throw new ImageProcessingError(
+      "MALFORMED_IMAGE",
+      "The uploaded image does not contain valid dimensions",
+      { statusCode: 422 },
+    );
+  }
+}
+
+async function generateDerivative(input, target, maxInputPixels) {
+  let output;
+  try {
+    output = await sharp(input, {
+      failOn: "error",
+      limitInputPixels: maxInputPixels,
+    })
+      .autoOrient()
+      .flatten({ background: BLACK })
+      .resize({
+        width: target.maxWidth,
+        height: target.maxHeight,
+        fit: "inside",
+        withoutEnlargement: true,
+      })
+      .toColourspace("srgb")
+      .webp({ quality: target.quality, effort: 4 })
+      .toBuffer({ resolveWithObject: true });
+  } catch (error) {
+    throw decodeError(error, maxInputPixels);
+  }
+
+  return {
+    buffer: output.data,
+    sha256: sha256(output.data),
+    format: "webp",
+    contentType: CONTENT_TYPES.webp,
+    byteSize: output.data.length,
+    width: output.info.width,
+    height: output.info.height,
+  };
+}
+
+function originalMetadata(metadata, inputDescription) {
+  const orientedDimensions = metadata.autoOrient || {
+    width: metadata.width,
+    height: metadata.height,
+  };
+
+  return {
+    sha256: inputDescription.sha256,
+    format: metadata.format,
+    contentType: CONTENT_TYPES[metadata.format],
+    byteSize: inputDescription.byteSize,
+    // Width and height describe how the original should appear after applying
+    // its source orientation. The encoded dimensions remain available for
+    // diagnostics without implying that the archived bytes were rewritten.
+    width: orientedDimensions.width,
+    height: orientedDimensions.height,
+    encodedWidth: metadata.width,
+    encodedHeight: metadata.height,
+    orientation: metadata.orientation ?? null,
+    pages: metadata.pages ?? 1,
+    channels: metadata.channels,
+    hasAlpha: Boolean(metadata.hasAlpha),
+  };
+}
+
+function createImageProcessor(options) {
+  const config = normalizeOptions(options);
+
+  async function process(input) {
+    const inputDescription = await describeInput(input);
+    const metadata = await readMetadata(
+      inputDescription.sharpInput,
+      config.maxInputPixels,
+    );
+    validateMetadata(metadata);
+
+    const [display, thumbnail] = await Promise.all([
+      generateDerivative(
+        inputDescription.sharpInput,
+        config.display,
+        config.maxInputPixels,
+      ),
+      generateDerivative(
+        inputDescription.sharpInput,
+        config.thumbnail,
+        config.maxInputPixels,
+      ),
+    ]);
+
+    return {
+      original: originalMetadata(metadata, inputDescription),
+      display,
+      thumbnail,
+    };
+  }
+
+  return Object.freeze({ process });
+}
+
+module.exports = {
+  DEFAULT_IMAGE_DERIVATIVE_OPTIONS,
+  ImageProcessingError,
+  createImageProcessor,
+};

server/src/index.js

@@ -0,0 +1,51 @@
+const path = require("node:path");
+require("dotenv").config({ path: path.resolve(__dirname, "../../.env") });
+
+const { loadConfig, redactedConfig } = require("./config");
+const { createRuntime } = require("./runtime");
+
+async function startApplication({ env = process.env, logger = console } = {}) {
+  const config = loadConfig(env);
+  const runtime = createRuntime({ config, logger });
+  const address = await runtime.start();
+  const displayedHost = address.family === "IPv6" ? `[${address.address}]` : address.address;
+
+  logger.info?.(
+    `Announcements API listening on http://${displayedHost}:${address.port}`,
+  );
+  logger.info?.("Configuration loaded", redactedConfig(config));
+
+  let shutdownStarted = false;
+  const shutdown = async (signal) => {
+    if (shutdownStarted) return;
+    shutdownStarted = true;
+    try {
+      await runtime.stop(signal);
+    } catch (error) {
+      logger.error?.("Graceful shutdown failed", error);
+      process.exitCode = 1;
+    }
+  };
+
+  process.once("SIGTERM", shutdown);
+  process.once("SIGINT", shutdown);
+
+  return runtime;
+}
+
+async function main() {
+  try {
+    await startApplication();
+  } catch (error) {
+    console.error(error.message);
+    process.exitCode = 1;
+  }
+}
+
+if (require.main === module) {
+  main();
+}
+
+module.exports = {
+  startApplication,
+};

server/src/lifecycle/eligibility.js

@@ -0,0 +1,106 @@
+const ELIGIBILITY_REASONS = Object.freeze({
+  DISABLED: "disabled",
+  SCHEDULED_FUTURE: "scheduled_future",
+  SCHEDULED_ENDED: "scheduled_ended",
+  ASSET_NOT_READY: "asset_not_ready",
+  ASSET_EXPIRED: "asset_expired",
+});
+
+function read(object, snakeCaseName, camelCaseName) {
+  if (object && Object.hasOwn(object, snakeCaseName)) {
+    return object[snakeCaseName];
+  }
+  return object?.[camelCaseName];
+}
+
+function validateNow(nowMs) {
+  if (!Number.isSafeInteger(nowMs) || nowMs < 0) {
+    throw new TypeError("nowMs must be a non-negative, safe epoch-millisecond integer");
+  }
+}
+
+function evaluateEntryEligibility(entry, asset, nowMs) {
+  validateNow(nowMs);
+
+  const enabled = read(entry, "enabled", "enabled");
+  if (enabled !== true && enabled !== 1) {
+    return { playable: false, reason: ELIGIBILITY_REASONS.DISABLED };
+  }
+
+  const scheduleStartAt = read(entry, "schedule_start_at", "scheduleStartAt");
+  if (scheduleStartAt != null && nowMs < scheduleStartAt) {
+    return { playable: false, reason: ELIGIBILITY_REASONS.SCHEDULED_FUTURE };
+  }
+
+  const scheduleEndAt = read(entry, "schedule_end_at", "scheduleEndAt");
+  if (scheduleEndAt != null && nowMs >= scheduleEndAt) {
+    return { playable: false, reason: ELIGIBILITY_REASONS.SCHEDULED_ENDED };
+  }
+
+  if (read(asset, "status", "status") !== "ready") {
+    return { playable: false, reason: ELIGIBILITY_REASONS.ASSET_NOT_READY };
+  }
+
+  const expirationAt = read(asset, "expiration_at", "expirationAt");
+  if (expirationAt != null && nowMs >= expirationAt) {
+    return { playable: false, reason: ELIGIBILITY_REASONS.ASSET_EXPIRED };
+  }
+
+  return { playable: true, reason: null };
+}
+
+function resolveEntrySettings(entry, appSettings) {
+  const durationOverrideMs = read(
+    entry,
+    "duration_override_ms",
+    "durationOverrideMs",
+  );
+  const backgroundModeOverride = read(
+    entry,
+    "background_mode_override",
+    "backgroundModeOverride",
+  );
+  const backgroundColorOverride = read(
+    entry,
+    "background_color_override",
+    "backgroundColorOverride",
+  );
+  const backgroundDarkenedOverride = read(
+    entry,
+    "background_darkened_override",
+    "backgroundDarkenedOverride",
+  );
+
+  return {
+    durationMs:
+      durationOverrideMs ??
+      read(appSettings, "default_duration_ms", "defaultDurationMs"),
+    presentation: {
+      backgroundMode:
+        backgroundModeOverride ??
+        read(appSettings, "default_background_mode", "defaultBackgroundMode"),
+      backgroundColor:
+        backgroundColorOverride ??
+        read(
+          appSettings,
+          "default_solid_background_color",
+          "defaultSolidBackgroundColor",
+        ),
+      backgroundDarkened: Boolean(
+        backgroundDarkenedOverride ??
+          read(
+            appSettings,
+            "default_background_darkened",
+            "defaultBackgroundDarkened",
+          ),
+      ),
+      blurPx: read(appSettings, "default_blur_px", "defaultBlurPx"),
+    },
+  };
+}
+
+module.exports = {
+  ELIGIBILITY_REASONS,
+  evaluateEntryEligibility,
+  resolveEntrySettings,
+};

server/src/lifecycle/index.js

@@ -0,0 +1 @@
+module.exports = require("./eligibility");

server/src/playback/errors.js

@@ -0,0 +1,29 @@
+class PlaybackError extends Error {
+  constructor(code, message, { statusCode = 400, details } = {}) {
+    super(message);
+    this.name = "PlaybackError";
+    this.code = code;
+    this.statusCode = statusCode;
+    if (details !== undefined) this.details = details;
+  }
+}
+
+function playlistNotFound(playlistId) {
+  return new PlaybackError("PLAYLIST_NOT_FOUND", "Playlist not found", {
+    statusCode: 404,
+    details: { playlistId },
+  });
+}
+
+function assetNotFound(assetId) {
+  return new PlaybackError("ASSET_NOT_FOUND", "Library asset not found", {
+    statusCode: 404,
+    details: { assetId },
+  });
+}
+
+module.exports = {
+  PlaybackError,
+  assetNotFound,
+  playlistNotFound,
+};

server/src/playback/index.js

@@ -0,0 +1,7 @@
+const { PlaybackError } = require("./errors");
+const { createPlaybackService } = require("./service");
+
+module.exports = {
+  PlaybackError,
+  createPlaybackService,
+};

server/src/playback/routes.js

@@ -0,0 +1,75 @@
+const express = require("express");
+
+function createPlaybackRouter(playbackService) {
+  const router = express.Router();
+
+  router.get("/", (request, response, next) => {
+    try {
+      response.json(playbackService.getSnapshot());
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.post("/pause", (request, response, next) => {
+    try {
+      response.json(playbackService.pause());
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.post("/resume", (request, response, next) => {
+    try {
+      response.json(playbackService.resume());
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.post("/next", (request, response, next) => {
+    try {
+      response.json(playbackService.next());
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.post("/previous", (request, response, next) => {
+    try {
+      response.json(playbackService.previous());
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.post("/static", (request, response, next) => {
+    try {
+      response.json(playbackService.enterStatic(request.body?.assetId));
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.put("/mode", (request, response, next) => {
+    try {
+      response.json(playbackService.setMode(request.body?.mode));
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.post("/reload", (request, response, next) => {
+    try {
+      response.json(playbackService.reload());
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  return router;
+}
+
+module.exports = {
+  createPlaybackRouter,
+};

server/src/playlists/errors.js

@@ -0,0 +1,31 @@
+class PlaylistError extends Error {
+  constructor(code, message, { statusCode = 400, details, cause } = {}) {
+    super(message, cause ? { cause } : undefined);
+    this.name = "PlaylistError";
+    this.code = code;
+    this.statusCode = statusCode;
+    if (details !== undefined) {
+      this.details = details;
+    }
+  }
+}
+
+function playlistNotFound(playlistId) {
+  return new PlaylistError("PLAYLIST_NOT_FOUND", "Playlist not found", {
+    statusCode: 404,
+    details: { playlistId },
+  });
+}
+
+function playlistEntryNotFound(playlistId, entryId) {
+  return new PlaylistError("PLAYLIST_ENTRY_NOT_FOUND", "Playlist entry not found", {
+    statusCode: 404,
+    details: { playlistId, entryId },
+  });
+}
+
+module.exports = {
+  PlaylistError,
+  playlistEntryNotFound,
+  playlistNotFound,
+};

server/src/playlists/index.js

@@ -0,0 +1,7 @@
+const { createPlaylistRouter } = require("./routes");
+const { createPlaylistService } = require("./service");
+
+module.exports = {
+  createPlaylistRouter,
+  createPlaylistService,
+};

server/src/playlists/routes.js

@@ -0,0 +1,143 @@
+const express = require("express");
+const { PlaylistError } = require("./errors");
+
+function orderedEntryIds(body) {
+  if (body === null || typeof body !== "object" || Array.isArray(body)) {
+    throw new PlaylistError(
+      "INVALID_PLAYLIST_ORDER",
+      "Playlist order must be an object containing entryIds",
+    );
+  }
+  const fields = Object.keys(body);
+  if (fields.length !== 1 || fields[0] !== "entryIds") {
+    throw new PlaylistError(
+      "INVALID_PLAYLIST_ORDER",
+      "Playlist order must contain only entryIds",
+      {
+        details: {
+          fields,
+          requiredFields: ["entryIds"],
+        },
+      },
+    );
+  }
+  return body.entryIds;
+}
+
+function createPlaylistRouter(
+  playlistService,
+  { playbackService } = {},
+) {
+  const router = express.Router();
+
+  router.get("/", (request, response, next) => {
+    try {
+      response.json({ playlists: playlistService.list() });
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.post("/", (request, response, next) => {
+    try {
+      response.status(201).json(playlistService.create(request.body));
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.get("/:playlistId", (request, response, next) => {
+    try {
+      response.json(playlistService.get(request.params.playlistId));
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.patch("/:playlistId", (request, response, next) => {
+    try {
+      response.json(
+        playlistService.update(request.params.playlistId, request.body),
+      );
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.delete("/:playlistId", (request, response, next) => {
+    try {
+      response.json(playlistService.remove(request.params.playlistId));
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.post("/:playlistId/entries", (request, response, next) => {
+    try {
+      response
+        .status(201)
+        .json(playlistService.addEntry(request.params.playlistId, request.body));
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.patch("/:playlistId/entries/:entryId", (request, response, next) => {
+    try {
+      response.json(
+        playlistService.updateEntry(
+          request.params.playlistId,
+          request.params.entryId,
+          request.body,
+        ),
+      );
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.delete("/:playlistId/entries/:entryId", (request, response, next) => {
+    try {
+      response.json(
+        playlistService.removeEntry(
+          request.params.playlistId,
+          request.params.entryId,
+        ),
+      );
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.put("/:playlistId/entries/order", (request, response, next) => {
+    try {
+      response.json(
+        playlistService.reorderEntries(
+          request.params.playlistId,
+          orderedEntryIds(request.body),
+        ),
+      );
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  router.post("/:playlistId/activate", (request, response, next) => {
+    try {
+      if (!playbackService) {
+        throw new Error("The playback service is required for playlist activation");
+      }
+      const result = playbackService.activatePlaylist(request.params.playlistId);
+      response.json(result);
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  return router;
+}
+
+module.exports = {
+  createPlaylistRouter,
+  orderedEntryIds,
+};

server/src/playlists/service.js

@@ -0,0 +1,884 @@
+const crypto = require("node:crypto");
+const {
+  evaluateEntryEligibility,
+  resolveEntrySettings,
+} = require("../lifecycle");
+const {
+  PlaylistError,
+  playlistEntryNotFound,
+  playlistNotFound,
+} = require("./errors");
+
+const MIN_DURATION_MS = 1_000;
+const MAX_DURATION_MS = 3_600_000;
+const MAX_PLAYLIST_NAME_LENGTH = 200;
+const BACKGROUND_MODES = new Set(["blurred", "solid", "black"]);
+const HEX_COLOR_PATTERN = /^#[0-9a-f]{6}$/i;
+const ENTRY_PATCH_FIELDS = new Set([
+  "enabled",
+  "durationOverrideMs",
+  "backgroundModeOverride",
+  "backgroundColorOverride",
+  "backgroundDarkenedOverride",
+  "scheduleStartAt",
+  "scheduleEndAt",
+]);
+
+function normalizeObject(input, code, message) {
+  if (input === null || typeof input !== "object" || Array.isArray(input)) {
+    throw new PlaylistError(code, message);
+  }
+  return input;
+}
+
+function normalizePlaylistName(value) {
+  if (typeof value !== "string") {
+    throw new PlaylistError(
+      "INVALID_PLAYLIST_NAME",
+      "Playlist name must be a string",
+    );
+  }
+  const normalized = value
+    .replace(/[\u0000-\u001f\u007f]/g, " ")
+    .replace(/\s+/g, " ")
+    .trim();
+  if (!normalized) {
+    throw new PlaylistError(
+      "INVALID_PLAYLIST_NAME",
+      "Playlist name cannot be empty",
+    );
+  }
+  if ([...normalized].length > MAX_PLAYLIST_NAME_LENGTH) {
+    throw new PlaylistError(
+      "INVALID_PLAYLIST_NAME",
+      `Playlist name cannot exceed ${MAX_PLAYLIST_NAME_LENGTH} characters`,
+      { details: { maxLength: MAX_PLAYLIST_NAME_LENGTH } },
+    );
+  }
+  return normalized;
+}
+
+function normalizeBoolean(value, field) {
+  if (typeof value !== "boolean") {
+    throw new PlaylistError(
+      "INVALID_PLAYLIST_ENTRY",
+      `${field} must be a boolean`,
+      { details: { field } },
+    );
+  }
+  return value ? 1 : 0;
+}
+
+function normalizeNullableDuration(value) {
+  if (value === null) return null;
+  if (
+    !Number.isSafeInteger(value) ||
+    value < MIN_DURATION_MS ||
+    value > MAX_DURATION_MS
+  ) {
+    throw new PlaylistError(
+      "INVALID_PLAYLIST_ENTRY",
+      `durationOverrideMs must be null or an integer from ${MIN_DURATION_MS} through ${MAX_DURATION_MS}`,
+      {
+        details: {
+          field: "durationOverrideMs",
+          min: MIN_DURATION_MS,
+          max: MAX_DURATION_MS,
+        },
+      },
+    );
+  }
+  return value;
+}
+
+function normalizeNullableBackgroundMode(value) {
+  if (value === null) return null;
+  if (typeof value !== "string" || !BACKGROUND_MODES.has(value)) {
+    throw new PlaylistError(
+      "INVALID_PLAYLIST_ENTRY",
+      "backgroundModeOverride must be null, blurred, solid, or black",
+      { details: { field: "backgroundModeOverride" } },
+    );
+  }
+  return value;
+}
+
+function normalizeNullableColor(value) {
+  if (value === null) return null;
+  if (typeof value !== "string" || !HEX_COLOR_PATTERN.test(value)) {
+    throw new PlaylistError(
+      "INVALID_PLAYLIST_ENTRY",
+      "backgroundColorOverride must be null or a six-digit hex color",
+      { details: { field: "backgroundColorOverride" } },
+    );
+  }
+  return value.toUpperCase();
+}
+
+function normalizeNullableDarkening(value) {
+  if (value === null) return null;
+  return normalizeBoolean(value, "backgroundDarkenedOverride");
+}
+
+function normalizeNullableInstant(value, field) {
+  if (value === null) return null;
+  if (Number.isSafeInteger(value) && value >= 0) return value;
+  if (typeof value === "string" && value.trim()) {
+    const instant = value.trim();
+    if (!/([zZ]|[+-]\d{2}:\d{2})$/.test(instant)) {
+      throw new PlaylistError(
+        "INVALID_PLAYLIST_ENTRY",
+        `${field} ISO dates must include Z or a numeric UTC offset`,
+        { details: { field } },
+      );
+    }
+    const timestamp = Date.parse(instant);
+    if (Number.isSafeInteger(timestamp) && timestamp >= 0) return timestamp;
+  }
+  throw new PlaylistError(
+    "INVALID_PLAYLIST_ENTRY",
+    `${field} must be null, an epoch-millisecond integer, or an ISO date`,
+    { details: { field } },
+  );
+}
+
+function validateSchedule(startAt, endAt) {
+  if (startAt !== null && endAt !== null && startAt >= endAt) {
+    throw new PlaylistError(
+      "INVALID_PLAYLIST_ENTRY_SCHEDULE",
+      "scheduleStartAt must be earlier than scheduleEndAt",
+      { details: { scheduleStartAt: startAt, scheduleEndAt: endAt } },
+    );
+  }
+}
+
+function mapPlaylist(row) {
+  return {
+    id: row.id,
+    name: row.name,
+    revision: row.revision,
+    entryCount: Number(row.entry_count || 0),
+    isActive: Boolean(row.is_active),
+    isPendingActivation: Boolean(row.is_pending),
+    createdAt: row.created_at,
+    updatedAt: row.updated_at,
+  };
+}
+
+function mediaUrl(assetId, kind, sha256) {
+  return sha256
+    ? `/media/assets/${assetId}/${kind}/${sha256}.webp`
+    : null;
+}
+
+function mapResolvedEntry(row, settings, nowMs) {
+  const eligibility = evaluateEntryEligibility(row, row, nowMs);
+  const resolved = resolveEntrySettings(row, settings);
+  return {
+    id: row.entry_id,
+    playlistId: row.playlist_id,
+    assetId: row.asset_id,
+    enabled: Boolean(row.enabled),
+    position: row.position,
+    durationOverrideMs: row.duration_override_ms,
+    effectiveDurationMs: resolved.durationMs,
+    backgroundModeOverride: row.background_mode_override,
+    backgroundColorOverride: row.background_color_override,
+    backgroundDarkenedOverride:
+      row.background_darkened_override === null
+        ? null
+        : Boolean(row.background_darkened_override),
+    effectivePresentation: resolved.presentation,
+    scheduleStartAt: row.schedule_start_at,
+    scheduleEndAt: row.schedule_end_at,
+    playable: eligibility.playable,
+    notPlayableReason: eligibility.reason,
+    eligibility,
+    asset: {
+      id: row.asset_id,
+      displayName: row.asset_display_name,
+      originalFilename: row.asset_original_filename,
+      status: row.status,
+      expirationAt: row.expiration_at,
+      display: {
+        width: row.display_width,
+        height: row.display_height,
+        url: mediaUrl(row.asset_id, "display", row.display_sha256),
+      },
+      thumbnail: {
+        width: row.thumbnail_width,
+        height: row.thumbnail_height,
+        url: mediaUrl(row.asset_id, "thumbnail", row.thumbnail_sha256),
+      },
+    },
+    createdAt: row.entry_created_at,
+    updatedAt: row.entry_updated_at,
+  };
+}
+
+function createPlaylistService({
+  database,
+  now = Date.now,
+  createId = crypto.randomUUID,
+  onBeforeChange = () => {},
+  onChanged = () => {},
+}) {
+  const playlistSelect = `
+    SELECT p.*,
+      (SELECT COUNT(*) FROM playlist_entries pe WHERE pe.playlist_id = p.id)
+        AS entry_count,
+      EXISTS (
+        SELECT 1 FROM playback_state ps WHERE ps.active_playlist_id = p.id
+      ) AS is_active,
+      EXISTS (
+        SELECT 1 FROM playback_state ps WHERE ps.pending_playlist_id = p.id
+      ) AS is_pending
+    FROM playlists p
+  `;
+  const listPlaylists = database.prepare(
+    `${playlistSelect} ORDER BY p.name COLLATE NOCASE, p.id`,
+  );
+  const findPlaylist = database.prepare(`${playlistSelect} WHERE p.id = ?`);
+  const findPlaylistByName = database.prepare(
+    `${playlistSelect} WHERE p.name = ? COLLATE NOCASE`,
+  );
+  const insertPlaylist = database.prepare(`
+    INSERT INTO playlists (id, name, revision, created_at, updated_at)
+    VALUES (?, ?, 1, ?, ?)
+  `);
+  const renamePlaylist = database.prepare(`
+    UPDATE playlists
+    SET name = ?, revision = revision + 1, updated_at = ?
+    WHERE id = ?
+  `);
+  const deletePlaylist = database.prepare("DELETE FROM playlists WHERE id = ?");
+  const bumpPlaylistRevision = database.prepare(`
+    UPDATE playlists
+    SET revision = revision + 1, updated_at = ?
+    WHERE id = ?
+  `);
+  const readSettings = database.prepare("SELECT * FROM app_settings WHERE id = 1");
+  const readPlayback = database.prepare(
+    "SELECT * FROM playback_state WHERE output_id = 'global'",
+  );
+  const resolvedEntries = database.prepare(`
+    SELECT
+      pe.id AS entry_id,
+      pe.playlist_id,
+      pe.asset_id,
+      pe.enabled,
+      pe.duration_override_ms,
+      pe.background_mode_override,
+      pe.background_color_override,
+      pe.background_darkened_override,
+      pe.schedule_start_at,
+      pe.schedule_end_at,
+      pe.position,
+      pe.created_at AS entry_created_at,
+      pe.updated_at AS entry_updated_at,
+      a.display_name AS asset_display_name,
+      a.original_filename AS asset_original_filename,
+      a.status,
+      a.expiration_at,
+      a.display_sha256,
+      a.display_width,
+      a.display_height,
+      a.thumbnail_sha256,
+      a.thumbnail_width,
+      a.thumbnail_height
+    FROM playlist_entries pe
+    JOIN assets a ON a.id = pe.asset_id
+    WHERE pe.playlist_id = ?
+    ORDER BY pe.position, pe.id
+  `);
+  const findEntry = database.prepare(`
+    SELECT pe.*
+    FROM playlist_entries pe
+    WHERE pe.playlist_id = ? AND pe.id = ?
+  `);
+  const findEntryByAsset = database.prepare(`
+    SELECT pe.*
+    FROM playlist_entries pe
+    WHERE pe.playlist_id = ? AND pe.asset_id = ?
+  `);
+  const findEntryOwner = database.prepare(
+    "SELECT playlist_id FROM playlist_entries WHERE id = ?",
+  );
+  const listEntryIds = database.prepare(`
+    SELECT id, position
+    FROM playlist_entries
+    WHERE playlist_id = ?
+    ORDER BY position, id
+  `);
+  const findAsset = database.prepare("SELECT * FROM assets WHERE id = ?");
+  const nextPosition = database.prepare(`
+    SELECT COALESCE(MAX(position), -1) + 1 AS position
+    FROM playlist_entries
+    WHERE playlist_id = ?
+  `);
+  const insertEntry = database.prepare(`
+    INSERT INTO playlist_entries (
+      id, playlist_id, asset_id, enabled, duration_override_ms,
+      background_mode_override, background_color_override,
+      background_darkened_override, schedule_start_at, schedule_end_at,
+      position, created_at, updated_at
+    ) VALUES (
+      @id, @playlistId, @assetId, @enabled, @durationOverrideMs,
+      @backgroundModeOverride, @backgroundColorOverride,
+      @backgroundDarkenedOverride, @scheduleStartAt, @scheduleEndAt,
+      @position, @createdAt, @updatedAt
+    )
+  `);
+  const updateEntry = database.prepare(`
+    UPDATE playlist_entries
+    SET enabled = @enabled,
+        duration_override_ms = @durationOverrideMs,
+        background_mode_override = @backgroundModeOverride,
+        background_color_override = @backgroundColorOverride,
+        background_darkened_override = @backgroundDarkenedOverride,
+        schedule_start_at = @scheduleStartAt,
+        schedule_end_at = @scheduleEndAt,
+        updated_at = @updatedAt
+    WHERE playlist_id = @playlistId AND id = @entryId
+  `);
+  const deleteEntry = database.prepare(
+    "DELETE FROM playlist_entries WHERE playlist_id = ? AND id = ?",
+  );
+  const moveEntriesOutOfRange = database.prepare(`
+    UPDATE playlist_entries
+    SET position = position + ?
+    WHERE playlist_id = ?
+  `);
+  const setEntryPosition = database.prepare(`
+    UPDATE playlist_entries
+    SET position = ?, updated_at = ?
+    WHERE playlist_id = ? AND id = ?
+  `);
+  function getPlaylistRow(playlistId) {
+    const row = findPlaylist.get(playlistId);
+    if (!row) throw playlistNotFound(playlistId);
+    return row;
+  }
+
+  function getEntryRow(playlistId, entryId) {
+    getPlaylistRow(playlistId);
+    const row = findEntry.get(playlistId, entryId);
+    if (!row) throw playlistEntryNotFound(playlistId, entryId);
+    return row;
+  }
+
+  function nextTimestamp(row) {
+    return Math.max(now(), row.updated_at + 1);
+  }
+
+  function notify(change) {
+    // The transaction has committed before this synchronous domain hook runs.
+    // A reconciliation failure is surfaced to the caller so playback cannot
+    // silently remain inconsistent with a successful playlist mutation.
+    onChanged(change);
+  }
+
+  function duplicateName(name, row = findPlaylistByName.get(name)) {
+    return new PlaylistError(
+      "PLAYLIST_NAME_CONFLICT",
+      "Another playlist already uses that name",
+      {
+        statusCode: 409,
+        details: row ? { playlist: mapPlaylist(row) } : { name },
+      },
+    );
+  }
+
+  function validateCreate(input) {
+    normalizeObject(input, "INVALID_PLAYLIST", "Playlist must be an object");
+    const unknown = Object.keys(input).filter((key) => key !== "name");
+    if (unknown.length > 0) {
+      throw new PlaylistError(
+        "INVALID_PLAYLIST",
+        "Playlist contains unsupported fields",
+        { details: { fields: unknown } },
+      );
+    }
+    if (!Object.hasOwn(input, "name")) {
+      throw new PlaylistError("INVALID_PLAYLIST", "Playlist name is required", {
+        details: { field: "name" },
+      });
+    }
+    return normalizePlaylistName(input.name);
+  }
+
+  function validateEntryFields(input, { creating = false, current = null } = {}) {
+    normalizeObject(
+      input,
+      "INVALID_PLAYLIST_ENTRY",
+      "Playlist entry must be an object",
+    );
+    const allowed = creating
+      ? new Set(["assetId", ...ENTRY_PATCH_FIELDS])
+      : ENTRY_PATCH_FIELDS;
+    const unknown = Object.keys(input).filter((key) => !allowed.has(key));
+    if (unknown.length > 0) {
+      throw new PlaylistError(
+        "INVALID_PLAYLIST_ENTRY",
+        "Playlist entry contains unsupported fields",
+        { details: { fields: unknown } },
+      );
+    }
+    if (!creating && Object.keys(input).length === 0) {
+      throw new PlaylistError(
+        "INVALID_PLAYLIST_ENTRY",
+        "At least one playlist entry field is required",
+      );
+    }
+    if (creating && (typeof input.assetId !== "string" || !input.assetId.trim())) {
+      throw new PlaylistError(
+        "INVALID_PLAYLIST_ENTRY",
+        "assetId is required",
+        { details: { field: "assetId" } },
+      );
+    }
+
+    const value = (field, fallback) =>
+      Object.hasOwn(input, field) ? input[field] : fallback;
+    const normalized = {
+      assetId: creating ? input.assetId.trim() : current.asset_id,
+      enabled: Object.hasOwn(input, "enabled")
+        ? normalizeBoolean(input.enabled, "enabled")
+        : (current?.enabled ?? 1),
+      durationOverrideMs: Object.hasOwn(input, "durationOverrideMs")
+        ? normalizeNullableDuration(input.durationOverrideMs)
+        : (current?.duration_override_ms ?? null),
+      backgroundModeOverride: Object.hasOwn(input, "backgroundModeOverride")
+        ? normalizeNullableBackgroundMode(input.backgroundModeOverride)
+        : (current?.background_mode_override ?? null),
+      backgroundColorOverride: Object.hasOwn(input, "backgroundColorOverride")
+        ? normalizeNullableColor(input.backgroundColorOverride)
+        : (current?.background_color_override ?? null),
+      backgroundDarkenedOverride: Object.hasOwn(
+        input,
+        "backgroundDarkenedOverride",
+      )
+        ? normalizeNullableDarkening(input.backgroundDarkenedOverride)
+        : (current?.background_darkened_override ?? null),
+      scheduleStartAt: normalizeNullableInstant(
+        value("scheduleStartAt", current?.schedule_start_at ?? null),
+        "scheduleStartAt",
+      ),
+      scheduleEndAt: normalizeNullableInstant(
+        value("scheduleEndAt", current?.schedule_end_at ?? null),
+        "scheduleEndAt",
+      ),
+    };
+    validateSchedule(normalized.scheduleStartAt, normalized.scheduleEndAt);
+    return normalized;
+  }
+
+  function entryValuesEqual(current, next) {
+    return (
+      current.enabled === next.enabled &&
+      current.duration_override_ms === next.durationOverrideMs &&
+      current.background_mode_override === next.backgroundModeOverride &&
+      current.background_color_override === next.backgroundColorOverride &&
+      current.background_darkened_override === next.backgroundDarkenedOverride &&
+      current.schedule_start_at === next.scheduleStartAt &&
+      current.schedule_end_at === next.scheduleEndAt
+    );
+  }
+
+  function resolvedDetail(playlistId, nowMs = now()) {
+    const playlist = mapPlaylist(getPlaylistRow(playlistId));
+    const settings = readSettings.get();
+    if (!settings) throw new Error("The app_settings singleton row is missing");
+    return {
+      ...playlist,
+      evaluatedAt: nowMs,
+      settingsRevision: settings.revision,
+      entries: resolvedEntries
+        .all(playlistId)
+        .map((row) => mapResolvedEntry(row, settings, nowMs)),
+    };
+  }
+
+  const createTransaction = database.transaction((input) => {
+    const name = validateCreate(input);
+    const existing = findPlaylistByName.get(name);
+    if (existing) throw duplicateName(name, existing);
+    const timestamp = now();
+    const id = createId();
+    try {
+      insertPlaylist.run(id, name, timestamp, timestamp);
+    } catch (error) {
+      const conflict = findPlaylistByName.get(name);
+      if (conflict) throw duplicateName(name, conflict);
+      throw error;
+    }
+    return mapPlaylist(getPlaylistRow(id));
+  });
+
+  function create(input) {
+    const playlist = createTransaction(input);
+    notify({ reason: "created", playlistId: playlist.id, revision: playlist.revision });
+    return playlist;
+  }
+
+  function list() {
+    return listPlaylists.all().map(mapPlaylist);
+  }
+
+  function get(playlistId) {
+    return resolvedDetail(playlistId);
+  }
+
+  const updateTransaction = database.transaction((playlistId, input) => {
+    normalizeObject(input, "INVALID_PLAYLIST", "Playlist update must be an object");
+    const unknown = Object.keys(input).filter((key) => key !== "name");
+    if (unknown.length > 0) {
+      throw new PlaylistError(
+        "INVALID_PLAYLIST",
+        "Playlist update contains unsupported fields",
+        { details: { fields: unknown } },
+      );
+    }
+    if (!Object.hasOwn(input, "name") || Object.keys(input).length !== 1) {
+      throw new PlaylistError(
+        "INVALID_PLAYLIST",
+        "Playlist update requires a name",
+        { details: { field: "name" } },
+      );
+    }
+    const current = getPlaylistRow(playlistId);
+    const name = normalizePlaylistName(input.name);
+    if (current.name === name) {
+      return { changed: false, playlist: mapPlaylist(current) };
+    }
+    const conflict = findPlaylistByName.get(name);
+    if (conflict && conflict.id !== playlistId) throw duplicateName(name, conflict);
+    try {
+      renamePlaylist.run(name, nextTimestamp(current), playlistId);
+    } catch (error) {
+      const raced = findPlaylistByName.get(name);
+      if (raced && raced.id !== playlistId) throw duplicateName(name, raced);
+      throw error;
+    }
+    return { changed: true, playlist: mapPlaylist(getPlaylistRow(playlistId)) };
+  });
+
+  function update(playlistId, input) {
+    onBeforeChange({ reason: "before_playlist_update", playlistId });
+    const result = updateTransaction(playlistId, input);
+    if (result.changed) {
+      notify({
+        reason: "renamed",
+        playlistId,
+        revision: result.playlist.revision,
+      });
+    }
+    return result.playlist;
+  }
+
+  const removeTransaction = database.transaction((playlistId) => {
+    const playlist = getPlaylistRow(playlistId);
+    const state = readPlayback.get();
+    if (!state) throw new Error("The global playback_state row is missing");
+    if (state.active_playlist_id === playlistId) {
+      throw new PlaylistError(
+        "PLAYLIST_ACTIVE",
+        "The active playlist cannot be deleted",
+        { statusCode: 409, details: { playlistId } },
+      );
+    }
+    if (state.pending_playlist_id === playlistId) {
+      throw new PlaylistError(
+        "PLAYLIST_PENDING_ACTIVATION",
+        "A playlist pending activation cannot be deleted",
+        { statusCode: 409, details: { playlistId } },
+      );
+    }
+    deletePlaylist.run(playlistId);
+    return playlist;
+  });
+
+  function remove(playlistId) {
+    onBeforeChange({ reason: "before_playlist_delete", playlistId });
+    const playlist = removeTransaction(playlistId);
+    notify({ reason: "deleted", playlistId, revision: playlist.revision });
+    return { id: playlistId, deleted: true };
+  }
+
+  const addEntryTransaction = database.transaction((playlistId, input) => {
+    const playlist = getPlaylistRow(playlistId);
+    const fields = validateEntryFields(input, { creating: true });
+    const operationNow = now();
+    const asset = findAsset.get(fields.assetId);
+    if (!asset) {
+      throw new PlaylistError("ASSET_NOT_FOUND", "Library asset not found", {
+        statusCode: 404,
+        details: { assetId: fields.assetId },
+      });
+    }
+    if (asset.status !== "ready") {
+      throw new PlaylistError(
+        "ASSET_NOT_READY",
+        "Only ready library assets can be added to playlists",
+        {
+          statusCode: 409,
+          details: { assetId: asset.id, status: asset.status },
+        },
+      );
+    }
+    if (asset.expiration_at !== null && asset.expiration_at <= operationNow) {
+      throw new PlaylistError(
+        "ASSET_EXPIRED",
+        "Expired library assets cannot be added to playlists",
+        {
+          statusCode: 409,
+          details: { assetId: asset.id, expirationAt: asset.expiration_at },
+        },
+      );
+    }
+    const existing = findEntryByAsset.get(playlistId, fields.assetId);
+    if (existing) {
+      throw new PlaylistError(
+        "PLAYLIST_ENTRY_EXISTS",
+        "This asset already appears in the playlist",
+        {
+          statusCode: 409,
+          details: { playlistId, assetId: fields.assetId, entryId: existing.id },
+        },
+      );
+    }
+    const timestamp = Math.max(operationNow, playlist.updated_at + 1);
+    const id = createId();
+    try {
+      insertEntry.run({
+        id,
+        playlistId,
+        ...fields,
+        position: nextPosition.get(playlistId).position,
+        createdAt: timestamp,
+        updatedAt: timestamp,
+      });
+    } catch (error) {
+      const raced = findEntryByAsset.get(playlistId, fields.assetId);
+      if (raced) {
+        throw new PlaylistError(
+          "PLAYLIST_ENTRY_EXISTS",
+          "This asset already appears in the playlist",
+          {
+            statusCode: 409,
+            details: { playlistId, assetId: fields.assetId, entryId: raced.id },
+          },
+        );
+      }
+      throw error;
+    }
+    bumpPlaylistRevision.run(timestamp, playlistId);
+    return {
+      playlist: getPlaylistRow(playlistId),
+      entryId: id,
+      detail: resolvedDetail(playlistId, now()),
+    };
+  });
+
+  function addEntry(playlistId, input) {
+    onBeforeChange({ reason: "before_entry_add", playlistId });
+    const result = addEntryTransaction(playlistId, input);
+    notify({
+      reason: "entry_added",
+      playlistId,
+      revision: result.playlist.revision,
+      entryId: result.entryId,
+    });
+    return result.detail.entries.find((entry) => entry.id === result.entryId);
+  }
+
+  const patchEntryTransaction = database.transaction((playlistId, entryId, input) => {
+    const playlist = getPlaylistRow(playlistId);
+    const current = getEntryRow(playlistId, entryId);
+    const fields = validateEntryFields(input, { current });
+    if (entryValuesEqual(current, fields)) {
+      return {
+        changed: false,
+        invalidBoundaryChanged: false,
+        playlist,
+        detail: resolvedDetail(playlistId, now()),
+      };
+    }
+    const timestamp = nextTimestamp(playlist);
+    updateEntry.run({
+      playlistId,
+      entryId,
+      ...fields,
+      updatedAt: timestamp,
+    });
+    bumpPlaylistRevision.run(timestamp, playlistId);
+    return {
+      changed: true,
+      invalidBoundaryChanged:
+        current.schedule_end_at !== fields.scheduleEndAt,
+      playlist: getPlaylistRow(playlistId),
+      detail: resolvedDetail(playlistId, now()),
+    };
+  });
+
+  function updateEntryById(playlistId, entryId, input) {
+    onBeforeChange({
+      reason: "before_entry_update",
+      playlistId,
+      entryId,
+    });
+    const result = patchEntryTransaction(playlistId, entryId, input);
+    if (result.changed) {
+      notify({
+        reason: "entry_updated",
+        playlistId,
+        revision: result.playlist.revision,
+        entryId,
+        ...(result.invalidBoundaryChanged
+          ? { invalidBoundaryChanged: true }
+          : {}),
+      });
+    }
+    return result.detail.entries.find((entry) => entry.id === entryId);
+  }
+
+  const removeEntryTransaction = database.transaction((playlistId, entryId) => {
+    const playlist = getPlaylistRow(playlistId);
+    getEntryRow(playlistId, entryId);
+    const timestamp = nextTimestamp(playlist);
+    const result = deleteEntry.run(playlistId, entryId);
+    if (result.changes !== 1) throw playlistEntryNotFound(playlistId, entryId);
+    const remaining = listEntryIds.all(playlistId);
+    if (remaining.some((entry, index) => entry.position !== index)) {
+      moveEntriesOutOfRange.run(remaining.length + 1, playlistId);
+      remaining.forEach((entry, position) => {
+        setEntryPosition.run(position, timestamp, playlistId, entry.id);
+      });
+    }
+    bumpPlaylistRevision.run(timestamp, playlistId);
+    return { playlist: getPlaylistRow(playlistId) };
+  });
+
+  function removeEntryById(playlistId, entryId) {
+    onBeforeChange({
+      reason: "before_entry_delete",
+      playlistId,
+      entryId,
+    });
+    const result = removeEntryTransaction(playlistId, entryId);
+    notify({
+      reason: "entry_deleted",
+      playlistId,
+      revision: result.playlist.revision,
+      entryId,
+    });
+    return { id: entryId, deleted: true };
+  }
+
+  function validateOrder(playlistId, orderedEntryIds) {
+    if (!Array.isArray(orderedEntryIds)) {
+      throw new PlaylistError(
+        "INVALID_PLAYLIST_ORDER",
+        "Playlist order must be a complete array of entry IDs",
+      );
+    }
+    if (orderedEntryIds.some((id) => typeof id !== "string" || !id)) {
+      throw new PlaylistError(
+        "INVALID_PLAYLIST_ORDER",
+        "Every ordered entry ID must be a non-empty string",
+      );
+    }
+    const duplicates = orderedEntryIds.filter(
+      (id, index) => orderedEntryIds.indexOf(id) !== index,
+    );
+    if (duplicates.length > 0) {
+      throw new PlaylistError(
+        "PLAYLIST_ORDER_DUPLICATE_IDS",
+        "Playlist order contains duplicate entry IDs",
+        { details: { entryIds: [...new Set(duplicates)] } },
+      );
+    }
+
+    const current = listEntryIds.all(playlistId);
+    const currentIds = new Set(current.map((entry) => entry.id));
+    const suppliedIds = new Set(orderedEntryIds);
+    const extra = orderedEntryIds.filter((id) => !currentIds.has(id));
+    if (extra.length > 0) {
+      const foreign = extra.filter((id) => {
+        const owner = findEntryOwner.get(id);
+        return owner && owner.playlist_id !== playlistId;
+      });
+      if (foreign.length > 0) {
+        throw new PlaylistError(
+          "PLAYLIST_ORDER_FOREIGN_ENTRY",
+          "Playlist order contains an entry from another playlist",
+          { details: { entryIds: foreign } },
+        );
+      }
+      throw new PlaylistError(
+        "PLAYLIST_ORDER_UNKNOWN_ENTRY",
+        "Playlist order contains an unknown entry ID",
+        { details: { entryIds: extra } },
+      );
+    }
+    const missing = current
+      .map((entry) => entry.id)
+      .filter((id) => !suppliedIds.has(id));
+    if (missing.length > 0) {
+      throw new PlaylistError(
+        "PLAYLIST_ORDER_INCOMPLETE",
+        "Playlist order is missing current entries",
+        { details: { entryIds: missing } },
+      );
+    }
+    return current;
+  }
+
+  const reorderTransaction = database.transaction((playlistId, orderedEntryIds) => {
+    const playlist = getPlaylistRow(playlistId);
+    const current = validateOrder(playlistId, orderedEntryIds);
+    if (current.every((entry, index) => entry.id === orderedEntryIds[index])) {
+      return { changed: false, playlist, detail: resolvedDetail(playlistId, now()) };
+    }
+    const timestamp = nextTimestamp(playlist);
+    const offset = Math.max(current.length, 1);
+    moveEntriesOutOfRange.run(offset, playlistId);
+    orderedEntryIds.forEach((entryId, position) => {
+      setEntryPosition.run(position, timestamp, playlistId, entryId);
+    });
+    bumpPlaylistRevision.run(timestamp, playlistId);
+    return {
+      changed: true,
+      playlist: getPlaylistRow(playlistId),
+      detail: resolvedDetail(playlistId, now()),
+    };
+  });
+
+  function reorderEntries(playlistId, orderedEntryIds) {
+    onBeforeChange({ reason: "before_entries_reorder", playlistId });
+    const result = reorderTransaction(playlistId, orderedEntryIds);
+    if (result.changed) {
+      notify({ reason: "entries_reordered", playlistId, revision: result.playlist.revision });
+    }
+    return result.detail;
+  }
+
+  return {
+    addEntry,
+    create,
+    get,
+    list,
+    remove,
+    removeEntry: removeEntryById,
+    reorderEntries,
+    update,
+    updateEntry: updateEntryById,
+  };
+}
+
+module.exports = {
+  MAX_DURATION_MS,
+  MIN_DURATION_MS,
+  createPlaylistService,
+  normalizePlaylistName,
+};

server/src/runtime.js

@@ -0,0 +1,213 @@
+const http = require("node:http");
+const { Server: SocketServer } = require("socket.io");
+const { createApp } = require("./app");
+const { openDatabase } = require("./database");
+const { runMigrations } = require("./database/migrate");
+const { createImageProcessor } = require("./image-processing");
+const { createPlaybackService } = require("./playback");
+const { createStorageService } = require("./storage");
+
+function listen(httpServer, port, host) {
+  return new Promise((resolve, reject) => {
+    function onError(error) {
+      httpServer.off("listening", onListening);
+      reject(error);
+    }
+    function onListening() {
+      httpServer.off("error", onError);
+      resolve(httpServer.address());
+    }
+    httpServer.once("error", onError);
+    httpServer.once("listening", onListening);
+    httpServer.listen(port, host);
+  });
+}
+
+function createRuntime({
+  config,
+  imageProcessor: suppliedImageProcessor,
+  logger = console,
+  storage: suppliedStorage,
+}) {
+  const database = openDatabase(config.database);
+  let migrations;
+  try {
+    migrations = runMigrations(database);
+  } catch (error) {
+    database.close();
+    throw error;
+  }
+
+  const lifecycle = {
+    ready: false,
+    stopping: false,
+  };
+  let storage;
+  let imageProcessor;
+  try {
+    storage = suppliedStorage || createStorageService(config.storage, { logger });
+    imageProcessor =
+      suppliedImageProcessor ||
+      createImageProcessor({ maxInputPixels: config.processing.maxInputPixels });
+  } catch (error) {
+    database.close();
+    throw error;
+  }
+  let app;
+  let io = null;
+  let playbackService;
+  function emitSocketEvent(eventName, payload) {
+    try {
+      io?.emit(eventName, payload);
+    } catch (error) {
+      try {
+        logger.warn?.(`Socket.IO ${eventName} publish failed`, error);
+      } catch {
+        // Socket invalidation remains best effort after the authoritative commit.
+      }
+    }
+  }
+  try {
+    playbackService = createPlaybackService({
+      database,
+      logger,
+      onActivationChanged(event) {
+        emitSocketEvent("playlists:changed", event);
+      },
+      onStateChanged(snapshot) {
+        emitSocketEvent("playback:state", snapshot);
+      },
+    });
+    app = createApp({
+      config,
+      database,
+      imageProcessor,
+      lifecycle,
+      logger,
+      migrations,
+      onPlaylistsChanged(event) {
+        emitSocketEvent("playlists:changed", event);
+      },
+      playbackService,
+      storage,
+    });
+  } catch (error) {
+    storage.stop();
+    database.close();
+    throw error;
+  }
+  const httpServer = http.createServer(app);
+  io = new SocketServer(httpServer, {
+    serveClient: false,
+  });
+
+  io.on("connection", (socket) => {
+    logger.info?.(`Socket.IO client connected: ${socket.id}`);
+    try {
+      socket.emit("playback:state", playbackService.getSnapshot());
+    } catch (error) {
+      logger.warn?.("Initial playback snapshot could not be sent", error);
+    }
+    socket.on("disconnect", () => {
+      logger.info?.(`Socket.IO client disconnected: ${socket.id}`);
+    });
+  });
+
+  let address = null;
+  let startPromise = null;
+  let stopPromise = null;
+
+  async function start() {
+    if (stopPromise) {
+      throw new Error("Cannot start a runtime after shutdown has begun");
+    }
+    if (startPromise) {
+      return startPromise;
+    }
+
+    startPromise = Promise.resolve()
+      .then(() => playbackService.initialize())
+      .then(() => playbackService.start())
+      .then(() => listen(httpServer, config.port, config.host))
+      .then((listeningAddress) => {
+        address = listeningAddress;
+        lifecycle.ready = true;
+        Promise.resolve()
+          .then(() => storage.start())
+          .catch(() => {
+            logger.warn?.("Object storage health checks could not be started");
+          });
+        return listeningAddress;
+      })
+      .catch((error) => {
+        playbackService.stop();
+        storage.stop();
+        database.close();
+        throw error;
+      });
+    return startPromise;
+  }
+
+  async function stop(reason = "shutdown") {
+    if (stopPromise) {
+      return stopPromise;
+    }
+
+    lifecycle.ready = false;
+    lifecycle.stopping = true;
+    playbackService.stop();
+    stopPromise = new Promise((resolve) => {
+      let settled = false;
+      const finish = () => {
+        if (settled) return;
+        settled = true;
+        clearTimeout(timeout);
+        storage.stop();
+        if (database.open) {
+          database.close();
+        }
+        resolve();
+      };
+      const timeout = setTimeout(() => {
+        logger.warn?.(
+          `Graceful shutdown timed out after ${config.shutdownTimeoutMs}ms`,
+        );
+        httpServer.closeAllConnections?.();
+        finish();
+      }, config.shutdownTimeoutMs);
+      timeout.unref?.();
+
+      if (!httpServer.listening) {
+        io.close();
+        finish();
+        return;
+      }
+
+      logger.info?.(`Stopping Announcements API (${reason})`);
+      io.close(finish);
+    });
+    return stopPromise;
+  }
+
+  return {
+    app,
+    config,
+    database,
+    httpServer,
+    io,
+    lifecycle,
+    migrations,
+    playbackService,
+    storage,
+    imageProcessor,
+    get address() {
+      return address;
+    },
+    start,
+    stop,
+  };
+}
+
+module.exports = {
+  createRuntime,
+};

server/src/settings/routes.js

@@ -0,0 +1,42 @@
+const express = require("express");
+
+function createSettingsRouter(
+  settingsService,
+  {
+    onBeforePlaybackDomainChange = () => {},
+    onPlaylistsChanged = () => {},
+    onPlaybackDomainChanged = () => {},
+  } = {},
+) {
+  const router = express.Router();
+
+  router.get("/", (request, response) => {
+    response.json(settingsService.get());
+  });
+
+  router.patch("/", (request, response, next) => {
+    try {
+      const previous = settingsService.get();
+      onBeforePlaybackDomainChange({ reason: "before_settings_update" });
+      const updated = settingsService.update(request.body);
+      if (updated.revision !== previous.revision) {
+        const change = {
+          reason: "settings_updated",
+          playlistIds: null,
+          settingsRevision: updated.revision,
+        };
+        onPlaybackDomainChanged(change);
+        onPlaylistsChanged(change);
+      }
+      response.json(updated);
+    } catch (error) {
+      next(error);
+    }
+  });
+
+  return router;
+}
+
+module.exports = {
+  createSettingsRouter,
+};

server/src/settings/service.js

@@ -0,0 +1,157 @@
+const SETTING_COLUMNS = Object.freeze({
+  defaultDurationMs: "default_duration_ms",
+  defaultBackgroundMode: "default_background_mode",
+  defaultSolidBackgroundColor: "default_solid_background_color",
+  defaultBackgroundDarkened: "default_background_darkened",
+  defaultBlurPx: "default_blur_px",
+  crossfadeDurationMs: "crossfade_duration_ms",
+});
+
+class SettingsValidationError extends Error {
+  constructor(message, details = {}) {
+    super(message);
+    this.name = "SettingsValidationError";
+    this.statusCode = 400;
+    this.code = "INVALID_SETTINGS";
+    this.details = details;
+  }
+}
+
+function mapSettings(row) {
+  return {
+    revision: row.revision,
+    defaultDurationMs: row.default_duration_ms,
+    defaultBackgroundMode: row.default_background_mode,
+    defaultSolidBackgroundColor: row.default_solid_background_color,
+    defaultBackgroundDarkened: Boolean(row.default_background_darkened),
+    defaultBlurPx: row.default_blur_px,
+    crossfadeDurationMs: row.crossfade_duration_ms,
+    updatedAt: row.updated_at,
+  };
+}
+
+function validateSafeInteger(name, value, { positive = false } = {}) {
+  if (!Number.isSafeInteger(value) || (positive ? value <= 0 : value < 0)) {
+    const qualifier = positive ? "a positive" : "a non-negative";
+    throw new SettingsValidationError(`${name} must be ${qualifier} integer`, {
+      field: name,
+    });
+  }
+}
+
+function validatePatch(input) {
+  if (input === null || typeof input !== "object" || Array.isArray(input)) {
+    throw new SettingsValidationError("Settings payload must be a JSON object");
+  }
+
+  const keys = Object.keys(input);
+  const unknown = keys.filter((key) => !Object.hasOwn(SETTING_COLUMNS, key));
+  if (unknown.length > 0) {
+    throw new SettingsValidationError("Settings payload contains unknown fields", {
+      fields: unknown,
+    });
+  }
+  if (keys.length === 0) {
+    throw new SettingsValidationError("At least one setting is required");
+  }
+
+  if ("defaultDurationMs" in input) {
+    validateSafeInteger("defaultDurationMs", input.defaultDurationMs, {
+      positive: true,
+    });
+  }
+  if (
+    "defaultBackgroundMode" in input &&
+    !["blurred", "solid", "black"].includes(input.defaultBackgroundMode)
+  ) {
+    throw new SettingsValidationError(
+      "defaultBackgroundMode must be blurred, solid, or black",
+      { field: "defaultBackgroundMode" },
+    );
+  }
+  if (
+    "defaultSolidBackgroundColor" in input &&
+    (typeof input.defaultSolidBackgroundColor !== "string" ||
+      !/^#[0-9a-f]{6}$/i.test(input.defaultSolidBackgroundColor))
+  ) {
+    throw new SettingsValidationError(
+      "defaultSolidBackgroundColor must be a six-digit hex color",
+      { field: "defaultSolidBackgroundColor" },
+    );
+  }
+  if (
+    "defaultBackgroundDarkened" in input &&
+    typeof input.defaultBackgroundDarkened !== "boolean"
+  ) {
+    throw new SettingsValidationError(
+      "defaultBackgroundDarkened must be a boolean",
+      { field: "defaultBackgroundDarkened" },
+    );
+  }
+  if ("defaultBlurPx" in input) {
+    validateSafeInteger("defaultBlurPx", input.defaultBlurPx);
+  }
+  if ("crossfadeDurationMs" in input) {
+    validateSafeInteger("crossfadeDurationMs", input.crossfadeDurationMs);
+  }
+
+  return input;
+}
+
+function createSettingsService(database, { now = Date.now } = {}) {
+  const read = database.prepare("SELECT * FROM app_settings WHERE id = 1");
+  const update = database.prepare(`
+    UPDATE app_settings
+    SET revision = revision + 1,
+        default_duration_ms = @defaultDurationMs,
+        default_background_mode = @defaultBackgroundMode,
+        default_solid_background_color = @defaultSolidBackgroundColor,
+        default_background_darkened = @defaultBackgroundDarkened,
+        default_blur_px = @defaultBlurPx,
+        crossfade_duration_ms = @crossfadeDurationMs,
+        updated_at = @updatedAt
+    WHERE id = 1
+  `);
+
+  function get() {
+    const row = read.get();
+    if (!row) {
+      throw new Error("The app_settings singleton row is missing");
+    }
+    return mapSettings(row);
+  }
+
+  const updateTransaction = database.transaction((patch) => {
+    validatePatch(patch);
+    const current = get();
+    const next = { ...current, ...patch };
+    const changed = Object.keys(patch).some((key) => current[key] !== next[key]);
+
+    if (!changed) {
+      return current;
+    }
+
+    update.run({
+      defaultDurationMs: next.defaultDurationMs,
+      defaultBackgroundMode: next.defaultBackgroundMode,
+      defaultSolidBackgroundColor: next.defaultSolidBackgroundColor,
+      defaultBackgroundDarkened: next.defaultBackgroundDarkened ? 1 : 0,
+      defaultBlurPx: next.defaultBlurPx,
+      crossfadeDurationMs: next.crossfadeDurationMs,
+      updatedAt: Math.max(now(), current.updatedAt + 1),
+    });
+    return get();
+  });
+
+  return {
+    get,
+    update: updateTransaction,
+  };
+}
+
+module.exports = {
+  SettingsValidationError,
+  createSettingsService,
+  mapSettings,
+  validatePatch,
+};

server/src/storage/index.js

@@ -0,0 +1,398 @@
+const {
+  CreateBucketCommand,
+  DeleteObjectCommand,
+  GetObjectCommand,
+  HeadBucketCommand,
+  HeadObjectCommand,
+  PutObjectCommand,
+  S3Client,
+} = require("@aws-sdk/client-s3");
+
+class StorageError extends Error {
+  constructor(message, { code, statusCode, cause } = {}) {
+    super(message, { cause });
+    this.name = "StorageError";
+    this.code = code || "STORAGE_ERROR";
+    this.statusCode = statusCode || 500;
+  }
+}
+
+class StorageUnavailableError extends StorageError {
+  constructor(cause) {
+    super("Object storage is unavailable", {
+      code: "STORAGE_UNAVAILABLE",
+      statusCode: 503,
+      cause,
+    });
+    this.name = "StorageUnavailableError";
+  }
+}
+
+class StorageObjectNotFoundError extends StorageError {
+  constructor(key, cause) {
+    super("Stored object was not found", {
+      code: "STORAGE_OBJECT_NOT_FOUND",
+      statusCode: 404,
+      cause,
+    });
+    this.name = "StorageObjectNotFoundError";
+    this.key = key;
+  }
+}
+
+function errorStatus(error) {
+  return error?.$metadata?.httpStatusCode || error?.statusCode;
+}
+
+function isMissingBucket(error) {
+  return (
+    error?.name === "NoSuchBucket" ||
+    error?.Code === "NoSuchBucket" ||
+    error?.code === "NoSuchBucket" ||
+    errorStatus(error) === 404
+  );
+}
+
+function isMissingObject(error) {
+  if (
+    error?.name === "NoSuchBucket" ||
+    error?.Code === "NoSuchBucket" ||
+    error?.code === "NoSuchBucket"
+  ) {
+    return false;
+  }
+  return (
+    error?.name === "NoSuchKey" ||
+    error?.name === "NotFound" ||
+    error?.Code === "NoSuchKey" ||
+    error?.code === "NoSuchKey" ||
+    errorStatus(error) === 404
+  );
+}
+
+function isBucketCreationConflict(error) {
+  return (
+    error?.name === "BucketAlreadyOwnedByYou" ||
+    error?.name === "BucketAlreadyExists" ||
+    error?.Code === "BucketAlreadyOwnedByYou" ||
+    error?.Code === "BucketAlreadyExists" ||
+    error?.code === "BucketAlreadyOwnedByYou" ||
+    error?.code === "BucketAlreadyExists"
+  );
+}
+
+function isConsumerCancellation(error) {
+  return (
+    error?.name === "AbortError" ||
+    error?.code === "ABORT_ERR" ||
+    error?.code === "ERR_STREAM_PREMATURE_CLOSE"
+  );
+}
+
+function assertObjectKey(key) {
+  if (typeof key !== "string" || key.length === 0) {
+    throw new TypeError("Storage object key must be a non-empty string");
+  }
+
+  const segments = key.split("/");
+  if (
+    key.startsWith("/") ||
+    key.includes("\\") ||
+    key.includes("\0") ||
+    segments.some((segment) => segment === "." || segment === "..")
+  ) {
+    throw new TypeError("Storage object key is invalid");
+  }
+}
+
+function publicHealth(health) {
+  return Object.freeze({ ...health });
+}
+
+function createS3Client(config) {
+  const options = {
+    endpoint: config.endpoint,
+    region: config.region,
+    forcePathStyle: config.forcePathStyle,
+    maxAttempts: config.maxAttempts,
+    requestHandler: {
+      connectionTimeout: config.connectionTimeoutMs,
+      // Use an inactivity timeout rather than an absolute request deadline so
+      // a large but continuously progressing upload is not aborted.
+      socketTimeout: config.requestTimeoutMs,
+    },
+    // Optional AWS checksums are not uniformly implemented by S3-compatible
+    // providers. Source and derivative SHA-256 hashes are verified by the app.
+    requestChecksumCalculation: "WHEN_REQUIRED",
+    responseChecksumValidation: "WHEN_REQUIRED",
+  };
+
+  if (config.accessKeyId && config.secretAccessKey) {
+    options.credentials = {
+      accessKeyId: config.accessKeyId,
+      secretAccessKey: config.secretAccessKey,
+    };
+  }
+
+  return new S3Client(options);
+}
+
+function createStorageService(config, { client, logger = console, now = () => new Date() } = {}) {
+  const s3 = client || createS3Client(config);
+  let ensurePromise = null;
+  let healthTimer = null;
+  let bucketReady = false;
+  let issuedHealthSequence = 0;
+  let appliedHealthSequence = 0;
+  let currentHealth = {
+    status: "degraded",
+    checkedAt: null,
+    lastSuccessAt: null,
+    code: "STORAGE_NOT_CHECKED",
+    message: "Object storage has not been checked",
+  };
+
+  function nextHealthSequence() {
+    issuedHealthSequence += 1;
+    return issuedHealthSequence;
+  }
+
+  function markHealthy(sequence) {
+    if (sequence < appliedHealthSequence) return publicHealth(currentHealth);
+    appliedHealthSequence = sequence;
+    bucketReady = true;
+    const checkedAt = now().toISOString();
+    currentHealth = {
+      status: "healthy",
+      checkedAt,
+      lastSuccessAt: checkedAt,
+    };
+    return publicHealth(currentHealth);
+  }
+
+  function markDegraded(sequence) {
+    if (sequence < appliedHealthSequence) return publicHealth(currentHealth);
+    appliedHealthSequence = sequence;
+    bucketReady = false;
+    currentHealth = {
+      status: "degraded",
+      checkedAt: now().toISOString(),
+      lastSuccessAt: currentHealth.lastSuccessAt,
+      code: "STORAGE_UNAVAILABLE",
+      message: "Object storage is unavailable",
+    };
+    return publicHealth(currentHealth);
+  }
+
+  function unavailable(error, sequence) {
+    markDegraded(sequence);
+    return error instanceof StorageUnavailableError
+      ? error
+      : new StorageUnavailableError(error);
+  }
+
+  async function ensureBucketOnce() {
+    const sequence = nextHealthSequence();
+    try {
+      await s3.send(new HeadBucketCommand({ Bucket: config.bucket }));
+      markHealthy(sequence);
+      return { created: false };
+    } catch (error) {
+      if (!isMissingBucket(error)) {
+        throw unavailable(error, sequence);
+      }
+    }
+
+    try {
+      await s3.send(new CreateBucketCommand({ Bucket: config.bucket }));
+      markHealthy(sequence);
+      return { created: true };
+    } catch (error) {
+      if (isBucketCreationConflict(error)) {
+        try {
+          await s3.send(new HeadBucketCommand({ Bucket: config.bucket }));
+          markHealthy(sequence);
+          return { created: false };
+        } catch (verificationError) {
+          throw unavailable(verificationError, sequence);
+        }
+      }
+      throw unavailable(error, sequence);
+    }
+  }
+
+  async function ensureBucket() {
+    if (!ensurePromise) {
+      ensurePromise = ensureBucketOnce().finally(() => {
+        ensurePromise = null;
+      });
+    }
+    return ensurePromise;
+  }
+
+  async function initialize() {
+    try {
+      await ensureBucket();
+    } catch (error) {
+      logger.warn?.("Object storage is unavailable during initialization");
+    }
+    return publicHealth(currentHealth);
+  }
+
+  async function start() {
+    if (!healthTimer) {
+      healthTimer = setInterval(() => {
+        ensureBucket().catch(() => {});
+      }, config.healthProbeIntervalMs || 30_000);
+      healthTimer.unref?.();
+    }
+    return initialize();
+  }
+
+  async function probe() {
+    const sequence = nextHealthSequence();
+    try {
+      await s3.send(new HeadBucketCommand({ Bucket: config.bucket }));
+      return markHealthy(sequence);
+    } catch (error) {
+      return markDegraded(sequence);
+    }
+  }
+
+  async function putObject({ key, body, contentType, contentLength, metadata }) {
+    assertObjectKey(key);
+    if (!bucketReady) await ensureBucket();
+    const sequence = nextHealthSequence();
+    const input = {
+      Bucket: config.bucket,
+      Key: key,
+      Body: body,
+      ...(contentType ? { ContentType: contentType } : {}),
+      ...(contentLength !== undefined ? { ContentLength: contentLength } : {}),
+      ...(metadata ? { Metadata: metadata } : {}),
+    };
+
+    try {
+      const result = await s3.send(new PutObjectCommand(input));
+      markHealthy(sequence);
+      return {
+        key,
+        etag: result.ETag || null,
+        versionId: result.VersionId || null,
+      };
+    } catch (error) {
+      throw unavailable(error, sequence);
+    }
+  }
+
+  function objectMetadata(key, result) {
+    return {
+      key,
+      contentType: result.ContentType || null,
+      contentLength:
+        result.ContentLength === undefined ? null : Number(result.ContentLength),
+      etag: result.ETag || null,
+      lastModified: result.LastModified || null,
+      metadata: result.Metadata || {},
+    };
+  }
+
+  async function getObject(key) {
+    assertObjectKey(key);
+    if (!bucketReady) await ensureBucket();
+    const sequence = nextHealthSequence();
+    try {
+      const result = await s3.send(
+        new GetObjectCommand({ Bucket: config.bucket, Key: key }),
+      );
+      markHealthy(sequence);
+      result.Body?.once?.("error", (error) => {
+        if (!isConsumerCancellation(error)) {
+          markDegraded(nextHealthSequence());
+        }
+      });
+      return {
+        ...objectMetadata(key, result),
+        body: result.Body,
+      };
+    } catch (error) {
+      if (isMissingObject(error)) {
+        markHealthy(sequence);
+        throw new StorageObjectNotFoundError(key, error);
+      }
+      throw unavailable(error, sequence);
+    }
+  }
+
+  async function headObject(key) {
+    assertObjectKey(key);
+    if (!bucketReady) await ensureBucket();
+    const sequence = nextHealthSequence();
+    try {
+      const result = await s3.send(
+        new HeadObjectCommand({ Bucket: config.bucket, Key: key }),
+      );
+      markHealthy(sequence);
+      return objectMetadata(key, result);
+    } catch (error) {
+      if (isMissingObject(error)) {
+        markHealthy(sequence);
+        return null;
+      }
+      throw unavailable(error, sequence);
+    }
+  }
+
+  async function objectExists(key) {
+    return (await headObject(key)) !== null;
+  }
+
+  async function deleteObject(key) {
+    assertObjectKey(key);
+    if (!bucketReady) await ensureBucket();
+    const sequence = nextHealthSequence();
+    try {
+      await s3.send(
+        new DeleteObjectCommand({ Bucket: config.bucket, Key: key }),
+      );
+      markHealthy(sequence);
+    } catch (error) {
+      if (isMissingObject(error)) {
+        markHealthy(sequence);
+        return;
+      }
+      throw unavailable(error, sequence);
+    }
+  }
+
+  function stop() {
+    if (healthTimer) {
+      clearInterval(healthTimer);
+      healthTimer = null;
+    }
+    s3.destroy?.();
+  }
+
+  return Object.freeze({
+    initialize,
+    start,
+    stop,
+    ensureBucket,
+    probe,
+    health: () => publicHealth(currentHealth),
+    putObject,
+    getObject,
+    headObject,
+    objectExists,
+    deleteObject,
+    destroy: stop,
+  });
+}
+
+module.exports = {
+  StorageError,
+  StorageObjectNotFoundError,
+  StorageUnavailableError,
+  createS3Client,
+  createStorageService,
+};

server/test/assets-api.test.js

@@ -0,0 +1,442 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const crypto = require("node:crypto");
+const fs = require("node:fs");
+const http = require("node:http");
+const os = require("node:os");
+const path = require("node:path");
+const { Readable } = require("node:stream");
+const sharp = require("sharp");
+const { createApp } = require("../src/app");
+const { loadConfig } = require("../src/config");
+const { openDatabase } = require("../src/database");
+const { runMigrations } = require("../src/database/migrate");
+const { createImageProcessor } = require("../src/image-processing");
+const { StorageObjectNotFoundError } = require("../src/storage");
+
+async function readBody(body) {
+  if (Buffer.isBuffer(body)) return body;
+  const chunks = [];
+  for await (const chunk of body) chunks.push(Buffer.from(chunk));
+  return Buffer.concat(chunks);
+}
+
+function memoryStorage() {
+  const objects = new Map();
+  return {
+    objects,
+    health() {
+      return {
+        status: "healthy",
+        checkedAt: "2033-05-18T03:33:20.000Z",
+        lastSuccessAt: "2033-05-18T03:33:20.000Z",
+      };
+    },
+    async putObject(input) {
+      objects.set(input.key, {
+        body: await readBody(input.body),
+        contentType: input.contentType,
+        metadata: input.metadata,
+      });
+      return { key: input.key };
+    },
+    async getObject(key) {
+      const object = objects.get(key);
+      if (!object) throw new StorageObjectNotFoundError(key);
+      return {
+        body: Readable.from([object.body]),
+        contentLength: object.body.length,
+        contentType: object.contentType,
+      };
+    },
+    async deleteObject(key) {
+      objects.delete(key);
+      return { key, deleted: true };
+    },
+  };
+}
+
+async function createHarness(t, { maxFileBytes = 1024 * 1024 } = {}) {
+  const tempDirectory = fs.mkdtempSync(
+    path.join(os.tmpdir(), "announcements-api-uploads-"),
+  );
+  const config = loadConfig({
+    NODE_ENV: "test",
+    HOST: "127.0.0.1",
+    PORT: "0",
+    DATABASE_PATH: ":memory:",
+    APP_TIMEZONE: "America/Chicago",
+    S3_ENDPOINT: "http://private-seaweedfs:8333",
+    S3_BUCKET: "announcements-test",
+    UPLOAD_TEMP_DIRECTORY: tempDirectory,
+    UPLOAD_MAX_FILE_BYTES: String(maxFileBytes),
+    UPLOAD_MAX_FILES: "5",
+    IMAGE_MAX_INPUT_PIXELS: "1000000",
+  });
+  const database = openDatabase({ path: ":memory:" });
+  const migrations = runMigrations(database);
+  const storage = memoryStorage();
+  const app = createApp({
+    config,
+    database,
+    imageProcessor: createImageProcessor({
+      maxInputPixels: config.processing.maxInputPixels,
+    }),
+    lifecycle: { ready: true },
+    migrations,
+    storage,
+  });
+  const server = app.listen(0, "127.0.0.1");
+  await new Promise((resolve, reject) => {
+    server.once("listening", resolve);
+    server.once("error", reject);
+  });
+
+  t.after(async () => {
+    await new Promise((resolve) => server.close(resolve));
+    database.close();
+    fs.rmSync(tempDirectory, { recursive: true, force: true });
+  });
+
+  return {
+    baseUrl: `http://127.0.0.1:${server.address().port}`,
+    database,
+    storage,
+    tempDirectory,
+  };
+}
+
+function appendFile(form, field, buffer, filename, contentType) {
+  form.append(field, new Blob([buffer], { type: contentType }), filename);
+}
+
+async function jsonResponse(baseUrl, route, init) {
+  const response = await fetch(`${baseUrl}${route}`, init);
+  return { response, body: await response.json() };
+}
+
+async function eventuallyEmpty(directory) {
+  for (let attempt = 0; attempt < 50; attempt += 1) {
+    if (fs.readdirSync(directory).length === 0) return;
+    await new Promise((resolve) => setTimeout(resolve, 10));
+  }
+  assert.deepEqual(fs.readdirSync(directory), []);
+}
+
+async function eventuallyContainsFile(directory) {
+  for (let attempt = 0; attempt < 50; attempt += 1) {
+    if (fs.readdirSync(directory).length > 0) return;
+    await new Promise((resolve) => setTimeout(resolve, 10));
+  }
+  assert.fail("The upload did not create its temporary file");
+}
+
+async function sampleImages() {
+  const source = sharp({
+    create: {
+      width: 80,
+      height: 60,
+      channels: 4,
+      background: { r: 31, g: 72, b: 120, alpha: 0.5 },
+    },
+  });
+  return {
+    jpeg: await source.clone().jpeg().toBuffer(),
+    png: await source.clone().png().toBuffer(),
+    webp: await source.clone().webp().toBuffer(),
+  };
+}
+
+test("asset HTTP API accepts JPEG, PNG, and WebP and serves private immutable media", async (t) => {
+  const harness = await createHarness(t);
+  const images = await sampleImages();
+  const form = new FormData();
+  appendFile(form, "files", images.jpeg, "welcome.jpg", "image/jpeg");
+  appendFile(form, "files", images.png, "../../bulletin.png", "image/png");
+  appendFile(form, "files", images.webp, "events.webp", "image/webp");
+
+  const uploaded = await jsonResponse(harness.baseUrl, "/api/assets", {
+    method: "POST",
+    body: form,
+  });
+  assert.equal(uploaded.response.status, 201);
+  assert.equal(uploaded.body.createdCount, 3);
+  assert.equal(uploaded.body.duplicateCount, 0);
+  assert.equal(uploaded.body.results.length, 3);
+  assert.deepEqual(
+    uploaded.body.results.map((result) => result.asset.original.contentType),
+    ["image/jpeg", "image/png", "image/webp"],
+  );
+  assert.equal(uploaded.body.results[1].asset.originalFilename, "bulletin.png");
+  assert.doesNotMatch(JSON.stringify(uploaded.body), /objectKey|object_key|private-seaweedfs/);
+  assert.equal(harness.storage.objects.size, 9);
+  await eventuallyEmpty(harness.tempDirectory);
+
+  const asset = uploaded.body.results[0].asset;
+  const listed = await jsonResponse(harness.baseUrl, "/api/assets");
+  assert.equal(listed.response.status, 200);
+  assert.equal(listed.body.assets.length, 3);
+  assert.deepEqual(
+    (await jsonResponse(harness.baseUrl, `/api/assets/${asset.id}`)).body,
+    asset,
+  );
+
+  for (const media of [asset.display, asset.thumbnail]) {
+    const response = await fetch(`${harness.baseUrl}${media.url}`);
+    const body = Buffer.from(await response.arrayBuffer());
+    assert.equal(response.status, 200);
+    assert.equal(response.headers.get("content-type"), "image/webp");
+    assert.equal(
+      response.headers.get("cache-control"),
+      "public, max-age=31536000, immutable",
+    );
+    assert.equal(response.headers.get("content-length"), String(body.length));
+    assert.equal(response.headers.get("etag"), `"${media.sha256}"`);
+    assert.equal(crypto.createHash("sha256").update(body).digest("hex"), media.sha256);
+  }
+
+  const original = await fetch(`${harness.baseUrl}${asset.original.url}`);
+  assert.equal(original.status, 200);
+  assert.equal(original.headers.get("content-type"), "image/jpeg");
+  assert.equal(original.headers.get("cache-control"), "private, no-store");
+  assert.match(original.headers.get("content-disposition"), /^attachment;/);
+  assert.deepEqual(Buffer.from(await original.arrayBuffer()), images.jpeg);
+
+  const wrongVersion = await jsonResponse(
+    harness.baseUrl,
+    `/media/assets/${asset.id}/display/${"a".repeat(64)}.webp`,
+  );
+  assert.equal(wrongVersion.response.status, 404);
+  assert.equal(wrongVersion.body.error.code, "MEDIA_NOT_FOUND");
+  const arbitraryKey = await jsonResponse(
+    harness.baseUrl,
+    `/media/assets/${asset.id}/display/${encodeURIComponent("../../original/key")}.webp`,
+  );
+  assert.equal(arbitraryKey.response.status, 404);
+  assert.equal(arbitraryKey.body.error.code, "MEDIA_NOT_FOUND");
+
+  const displayKey = [...harness.storage.objects.keys()].find(
+    (key) => key.includes(`assets/${asset.id}/display/`),
+  );
+  harness.storage.objects.delete(displayKey);
+  const missingStoredBytes = await jsonResponse(
+    harness.baseUrl,
+    asset.display.url,
+  );
+  assert.equal(missingStoredBytes.response.status, 503);
+  assert.equal(missingStoredBytes.body.error.code, "STORAGE_INCONSISTENCY");
+  assert.equal(
+    (await jsonResponse(harness.baseUrl, "/health/live")).response.status,
+    200,
+  );
+});
+
+test("asset HTTP API reports duplicates, name conflicts, and persists editable metadata", async (t) => {
+  const harness = await createHarness(t);
+  const { png, jpeg } = await sampleImages();
+  const firstForm = new FormData();
+  appendFile(firstForm, "file", png, "weekly.png", "application/octet-stream");
+  firstForm.append("display_name", "Weekly Announcement");
+  const first = await jsonResponse(harness.baseUrl, "/api/assets", {
+    method: "POST",
+    body: firstForm,
+  });
+  assert.equal(first.response.status, 201);
+  assert.equal(first.body.created, true);
+  const assetId = first.body.asset.id;
+
+  const duplicateForm = new FormData();
+  appendFile(duplicateForm, "file", png, "unrelated-name.png", "image/png");
+  duplicateForm.append("display_name", "Ignored duplicate proposal");
+  const duplicate = await jsonResponse(harness.baseUrl, "/api/assets", {
+    method: "POST",
+    body: duplicateForm,
+  });
+  assert.equal(duplicate.response.status, 200);
+  assert.equal(duplicate.body.created, false);
+  assert.equal(duplicate.body.duplicate, true);
+  assert.equal(duplicate.body.asset.id, assetId);
+  assert.equal(harness.storage.objects.size, 3);
+
+  const conflictForm = new FormData();
+  appendFile(conflictForm, "file", jpeg, "different.jpg", "image/jpeg");
+  conflictForm.append("displayName", "weekly announcement");
+  const conflict = await jsonResponse(harness.baseUrl, "/api/assets", {
+    method: "POST",
+    body: conflictForm,
+  });
+  assert.equal(conflict.response.status, 409);
+  assert.equal(conflict.body.error.code, "ASSET_NAME_CONFLICT");
+
+  const expiresAt = Date.parse("2034-01-02T03:04:05.000Z");
+  const edited = await jsonResponse(harness.baseUrl, `/api/assets/${assetId}`, {
+    method: "PATCH",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({
+      display_name: "Renamed announcement",
+      expiration_at: expiresAt,
+    }),
+  });
+  assert.equal(edited.response.status, 200);
+  assert.equal(edited.body.displayName, "Renamed announcement");
+  assert.equal(edited.body.expirationAt, expiresAt);
+  const permanent = await jsonResponse(harness.baseUrl, `/api/assets/${assetId}`, {
+    method: "PATCH",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({ expiration_at: null }),
+  });
+  assert.equal(permanent.body.expirationAt, null);
+  assert.equal(harness.storage.objects.size, 3);
+  await eventuallyEmpty(harness.tempDirectory);
+
+  const timestamp = Date.now();
+  harness.database
+    .prepare(
+      "INSERT INTO playlists (id, name, created_at, updated_at) VALUES (?, ?, ?, ?)",
+    )
+    .run("api-playlist", "API playlist", timestamp, timestamp);
+  harness.database
+    .prepare(
+      `INSERT INTO playlist_entries
+        (id, playlist_id, asset_id, position, created_at, updated_at)
+       VALUES (?, ?, ?, 0, ?, ?)`,
+    )
+    .run("api-entry", "api-playlist", assetId, timestamp, timestamp);
+  const references = await jsonResponse(
+    harness.baseUrl,
+    `/api/assets/${assetId}/references`,
+  );
+  assert.equal(references.response.status, 200);
+  assert.equal(references.body.canDelete, false);
+  assert.equal(references.body.playlists[0].playlistEntryId, "api-entry");
+  const blockedDelete = await jsonResponse(
+    harness.baseUrl,
+    `/api/assets/${assetId}`,
+    { method: "DELETE" },
+  );
+  assert.equal(blockedDelete.response.status, 409);
+  assert.equal(blockedDelete.body.error.code, "ASSET_REFERENCED");
+  assert.equal(harness.storage.objects.size, 3);
+  harness.database
+    .prepare("DELETE FROM playlist_entries WHERE id = ?")
+    .run("api-entry");
+
+  const removed = await jsonResponse(harness.baseUrl, `/api/assets/${assetId}`, {
+    method: "DELETE",
+  });
+  assert.equal(removed.response.status, 200);
+  assert.deepEqual(removed.body, { id: assetId, deleted: true });
+  assert.equal(harness.storage.objects.size, 0);
+  assert.equal(
+    (await jsonResponse(harness.baseUrl, `/api/assets/${assetId}`)).response.status,
+    404,
+  );
+});
+
+test("upload validation returns structured errors and always cleans temporary files", async (t) => {
+  const harness = await createHarness(t, { maxFileBytes: 1024 });
+
+  const malformed = new FormData();
+  appendFile(malformed, "file", Buffer.from("not an image"), "broken.png", "image/png");
+  const malformedResult = await jsonResponse(harness.baseUrl, "/api/assets", {
+    method: "POST",
+    body: malformed,
+  });
+  assert.equal(malformedResult.response.status, 422);
+  assert.equal(malformedResult.body.error.code, "MALFORMED_IMAGE");
+  await eventuallyEmpty(harness.tempDirectory);
+
+  const unsupportedBuffer = await sharp({
+    create: {
+      width: 20,
+      height: 20,
+      channels: 3,
+      background: "red",
+    },
+  })
+    .gif()
+    .toBuffer();
+  const unsupported = new FormData();
+  appendFile(unsupported, "file", unsupportedBuffer, "still.gif", "image/png");
+  const unsupportedResult = await jsonResponse(harness.baseUrl, "/api/assets", {
+    method: "POST",
+    body: unsupported,
+  });
+  assert.equal(unsupportedResult.response.status, 415);
+  assert.equal(unsupportedResult.body.error.code, "UNSUPPORTED_IMAGE_FORMAT");
+  await eventuallyEmpty(harness.tempDirectory);
+
+  const oversized = new FormData();
+  appendFile(
+    oversized,
+    "file",
+    crypto.randomBytes(1025),
+    "too-large.png",
+    "image/png",
+  );
+  const oversizedResult = await jsonResponse(harness.baseUrl, "/api/assets", {
+    method: "POST",
+    body: oversized,
+  });
+  assert.equal(oversizedResult.response.status, 413);
+  assert.equal(oversizedResult.body.error.code, "UPLOAD_FILE_TOO_LARGE");
+  assert.deepEqual(oversizedResult.body.error.details, { maxFileBytes: 1024 });
+  await eventuallyEmpty(harness.tempDirectory);
+
+  const tooMany = new FormData();
+  for (let index = 0; index < 6; index += 1) {
+    appendFile(tooMany, "files", Buffer.from("x"), `${index}.png`, "image/png");
+  }
+  const tooManyResult = await jsonResponse(harness.baseUrl, "/api/assets", {
+    method: "POST",
+    body: tooMany,
+  });
+  assert.equal(tooManyResult.response.status, 413);
+  assert.equal(tooManyResult.body.error.code, "UPLOAD_FILE_COUNT_EXCEEDED");
+  assert.deepEqual(tooManyResult.body.error.details, { maxFiles: 5 });
+  await eventuallyEmpty(harness.tempDirectory);
+
+  const absent = await jsonResponse(harness.baseUrl, "/api/assets", {
+    method: "POST",
+    body: new FormData(),
+  });
+  assert.equal(absent.response.status, 400);
+  assert.equal(absent.body.error.code, "UPLOAD_FILE_REQUIRED");
+  assert.equal(harness.storage.objects.size, 0);
+  assert.equal(
+    harness.database.prepare("SELECT COUNT(*) AS count FROM assets").get().count,
+    0,
+  );
+});
+
+test("an aborted multipart request removes its in-flight temporary file", async (t) => {
+  const harness = await createHarness(t);
+  const boundary = `announcements-${crypto.randomUUID()}`;
+  const preamble = Buffer.from(
+    `--${boundary}\r\n` +
+      'Content-Disposition: form-data; name="file"; filename="aborted.png"\r\n' +
+      "Content-Type: image/png\r\n\r\n",
+  );
+  const declaredLength = preamble.length + 512 * 1024;
+  const request = http.request(`${harness.baseUrl}/api/assets`, {
+    method: "POST",
+    headers: {
+      "content-type": `multipart/form-data; boundary=${boundary}`,
+      "content-length": String(declaredLength),
+    },
+  });
+  request.on("error", () => {});
+  request.write(preamble);
+  request.write(Buffer.alloc(64 * 1024, 1));
+
+  await eventuallyContainsFile(harness.tempDirectory);
+  const closed = new Promise((resolve) => request.once("close", resolve));
+  request.destroy();
+  await closed;
+  await eventuallyEmpty(harness.tempDirectory);
+  assert.equal(harness.storage.objects.size, 0);
+  assert.equal(
+    harness.database.prepare("SELECT COUNT(*) AS count FROM assets").get().count,
+    0,
+  );
+});

server/test/assets-multipart.test.js

@@ -0,0 +1,35 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const {
+  mapMulterError,
+  safeOriginalFilename,
+} = require("../src/assets/multipart");
+
+test("original filename metadata keeps a safe leaf without path traversal", () => {
+  assert.equal(safeOriginalFilename("../../Sunday/welcome.png"), "welcome.png");
+  assert.equal(safeOriginalFilename("..\\..\\Sunday\\welcome.png"), "welcome.png");
+  assert.equal(safeOriginalFilename("  welcome sign.png  "), "  welcome sign.png  ");
+});
+
+test("original filename metadata removes controls and remains bounded", () => {
+  assert.equal(safeOriginalFilename("wel\u0000come\n.png"), "welcome.png");
+  assert.equal([...safeOriginalFilename(`${"a".repeat(300)}.png`)].length, 255);
+  assert.throws(
+    () => safeOriginalFilename(" \u0000\n "),
+    (error) => error.code === "INVALID_ORIGINAL_FILENAME",
+  );
+});
+
+test("temporary-storage failures are server errors, not invalid client uploads", () => {
+  const storageFailure = mapMulterError(
+    Object.assign(new Error("disk full at a private path"), { code: "ENOSPC" }),
+    {},
+  );
+  assert.equal(storageFailure.code, "UPLOAD_TEMP_STORAGE_UNAVAILABLE");
+  assert.equal(storageFailure.statusCode, 503);
+  assert.doesNotMatch(storageFailure.message, /private path/);
+
+  const malformed = mapMulterError(new Error("Unexpected end of form"), {});
+  assert.equal(malformed.code, "INVALID_MULTIPART_UPLOAD");
+  assert.equal(malformed.statusCode, 400);
+});

server/test/assets-service.test.js

@@ -0,0 +1,608 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const crypto = require("node:crypto");
+const fs = require("node:fs");
+const os = require("node:os");
+const path = require("node:path");
+const { Readable } = require("node:stream");
+const { openDatabase } = require("../src/database");
+const { runMigrations } = require("../src/database/migrate");
+const { createAssetService } = require("../src/assets/service");
+const {
+  StorageObjectNotFoundError,
+  StorageUnavailableError,
+} = require("../src/storage");
+
+async function bufferBody(body) {
+  if (Buffer.isBuffer(body)) return body;
+  if (body instanceof Uint8Array) return Buffer.from(body);
+  const chunks = [];
+  for await (const chunk of body) chunks.push(Buffer.from(chunk));
+  return Buffer.concat(chunks);
+}
+
+function createMemoryStorage() {
+  const objects = new Map();
+  const calls = [];
+  let failNextPut = null;
+  let successfulPutsBeforeFailure = 0;
+  let failNextDelete = null;
+  let putDelayMs = 0;
+
+  return {
+    objects,
+    calls,
+    setPutFailure(error, putsBeforeFailure = 0) {
+      failNextPut = error;
+      successfulPutsBeforeFailure = putsBeforeFailure;
+    },
+    setDeleteFailure(error) {
+      failNextDelete = error;
+    },
+    setPutDelay(milliseconds) {
+      putDelayMs = milliseconds;
+    },
+    async putObject(input) {
+      calls.push({ operation: "put", ...input, body: undefined });
+      if (putDelayMs) {
+        await new Promise((resolve) => setTimeout(resolve, putDelayMs));
+      }
+      if (failNextPut) {
+        if (successfulPutsBeforeFailure === 0) {
+          const error = failNextPut;
+          failNextPut = null;
+          throw error;
+        }
+        successfulPutsBeforeFailure -= 1;
+      }
+      objects.set(input.key, {
+        body: await bufferBody(input.body),
+        contentType: input.contentType,
+        metadata: input.metadata,
+      });
+      return { key: input.key };
+    },
+    async getObject(key) {
+      calls.push({ operation: "get", key });
+      const object = objects.get(key);
+      if (!object) throw new StorageObjectNotFoundError(key);
+      return {
+        body: Readable.from(object.body),
+        contentLength: object.body.length,
+        contentType: object.contentType,
+      };
+    },
+    async deleteObject(key) {
+      calls.push({ operation: "delete", key });
+      if (failNextDelete) {
+        const error = failNextDelete;
+        failNextDelete = null;
+        throw error;
+      }
+      objects.delete(key);
+      return { key, deleted: true };
+    },
+  };
+}
+
+function createFakeImageProcessor({ reject } = {}) {
+  const calls = [];
+  return {
+    calls,
+    async process(filename) {
+      calls.push(filename);
+      if (reject) throw reject;
+      const original = await fs.promises.readFile(filename);
+      const sourceSha256 = crypto.createHash("sha256").update(original).digest("hex");
+      const displayBuffer = Buffer.from(`display:${sourceSha256}`);
+      const thumbnailBuffer = Buffer.from(`thumbnail:${sourceSha256}`);
+      return {
+        original: {
+          sha256: sourceSha256,
+          contentType: "image/png",
+          byteSize: original.length,
+          width: 1200,
+          height: 800,
+        },
+        display: {
+          buffer: displayBuffer,
+          sha256: crypto.createHash("sha256").update(displayBuffer).digest("hex"),
+          contentType: "image/webp",
+          byteSize: displayBuffer.length,
+          width: 1200,
+          height: 800,
+        },
+        thumbnail: {
+          buffer: thumbnailBuffer,
+          sha256: crypto.createHash("sha256").update(thumbnailBuffer).digest("hex"),
+          contentType: "image/webp",
+          byteSize: thumbnailBuffer.length,
+          width: 405,
+          height: 270,
+        },
+      };
+    },
+  };
+}
+
+function createHarness(options = {}) {
+  const database = openDatabase({ path: ":memory:" });
+  runMigrations(database);
+  const directory = fs.mkdtempSync(path.join(os.tmpdir(), "announcements-assets-"));
+  const storage = options.storage || createMemoryStorage();
+  const imageProcessor =
+    options.imageProcessor || createFakeImageProcessor(options.processorOptions);
+  let idCounter = 0;
+  let clock = 2_000_000_000_000;
+  const service = createAssetService({
+    database,
+    storage,
+    imageProcessor,
+    now: () => ++clock,
+    createId:
+      options.createId ||
+      (() => `00000000-0000-4000-8000-${String(++idCounter).padStart(12, "0")}`),
+    concurrentUploadWaitMs: options.concurrentUploadWaitMs ?? 2_000,
+  });
+
+  function uploadFile(originalFilename, contents) {
+    const buffer = Buffer.isBuffer(contents) ? contents : Buffer.from(contents);
+    const filename = path.join(directory, crypto.randomUUID());
+    fs.writeFileSync(filename, buffer);
+    return { path: filename, byteSize: buffer.length, originalFilename };
+  }
+
+  return {
+    database,
+    directory,
+    imageProcessor,
+    service,
+    storage,
+    uploadFile,
+    close() {
+      database.close();
+      fs.rmSync(directory, { recursive: true, force: true });
+    },
+  };
+}
+
+function rawAsset(database, assetId) {
+  return database.prepare("SELECT * FROM assets WHERE id = ?").get(assetId);
+}
+
+test("upload stores exact bytes under content-addressed keys without leaking keys", async (t) => {
+  const harness = createHarness();
+  t.after(() => harness.close());
+  const original = Buffer.from("exact uploaded bytes");
+
+  const [result] = await harness.service.upload([
+    harness.uploadFile("  Sunday Welcome.PNG  ", original),
+  ]);
+
+  assert.equal(result.created, true);
+  assert.equal(result.duplicate, false);
+  assert.match(result.asset.id, /^[0-9a-f-]{36}$/);
+  assert.equal(result.asset.displayName, "Sunday Welcome");
+  assert.equal(result.asset.originalFilename, "  Sunday Welcome.PNG  ");
+  assert.equal(result.asset.expirationAt, null);
+  assert.equal(result.asset.status, "ready");
+  assert.equal(result.asset.original.byteSize, original.length);
+  assert.equal(result.asset.display.contentType, "image/webp");
+  assert.equal(result.asset.thumbnail.width, 405);
+  assert.match(result.asset.display.url, /^\/media\/assets\//);
+  assert.doesNotMatch(
+    JSON.stringify(result.asset),
+    /object_key|originalObjectKey|displayObjectKey|thumbnailObjectKey|seaweed/i,
+  );
+
+  const row = rawAsset(harness.database, result.asset.id);
+  const expectedSourceHash = crypto.createHash("sha256").update(original).digest("hex");
+  assert.equal(row.source_sha256, expectedSourceHash);
+  assert.equal(row.original_object_key, `assets/${row.id}/original/${expectedSourceHash}`);
+  assert.equal(
+    row.display_object_key,
+    `assets/${row.id}/display/${row.display_sha256}.webp`,
+  );
+  assert.equal(
+    row.thumbnail_object_key,
+    `assets/${row.id}/thumbnail/${row.thumbnail_sha256}.webp`,
+  );
+  assert.deepEqual(harness.storage.objects.get(row.original_object_key).body, original);
+  assert.equal(harness.storage.objects.size, 3);
+
+  assert.deepEqual(harness.service.list(), [result.asset]);
+  assert.deepEqual(harness.service.get(result.asset.id), result.asset);
+});
+
+test("exact duplicate detection takes precedence over filename and display name", async (t) => {
+  const harness = createHarness();
+  t.after(() => harness.close());
+  const contents = Buffer.from("same image bytes");
+
+  const [created] = await harness.service.upload([
+    harness.uploadFile("first.png", contents),
+  ]);
+  const [sameFilename] = await harness.service.upload([
+    harness.uploadFile("first.png", contents),
+  ]);
+  const [differentFilename] = await harness.service.upload(
+    [harness.uploadFile("completely different name.webp", contents)],
+    { displayName: "A conflicting requested name is ignored for an exact duplicate" },
+  );
+
+  for (const duplicate of [sameFilename, differentFilename]) {
+    assert.equal(duplicate.created, false);
+    assert.equal(duplicate.duplicate, true);
+    assert.equal(duplicate.asset.id, created.asset.id);
+  }
+  assert.equal(harness.service.list().length, 1);
+  assert.equal(harness.storage.calls.filter((call) => call.operation === "put").length, 3);
+  assert.equal(harness.imageProcessor.calls.length, 1);
+});
+
+test("different content with the same proposed name is a conflict, not a duplicate", async (t) => {
+  const harness = createHarness();
+  t.after(() => harness.close());
+  await harness.service.upload([harness.uploadFile("bulletin.png", "image one")]);
+
+  await assert.rejects(
+    harness.service.upload([harness.uploadFile("bulletin.jpg", "image two")]),
+    (error) => {
+      assert.equal(error.statusCode, 409);
+      assert.equal(error.code, "ASSET_NAME_CONFLICT");
+      assert.equal(error.details.asset.displayName, "bulletin");
+      return true;
+    },
+  );
+  assert.equal(harness.service.list().length, 1);
+  assert.equal(harness.imageProcessor.calls.length, 1);
+
+  const [created] = await harness.service.upload(
+    [harness.uploadFile("bulletin.jpg", "image two")],
+    { displayName: "Second bulletin" },
+  );
+  assert.equal(created.created, true);
+  assert.notEqual(created.asset.sourceSha256, harness.service.list()[1].sourceSha256);
+  assert.equal(harness.service.list().length, 2);
+});
+
+test("multiple-file upload preserves order and deduplicates repeated bytes in the batch", async (t) => {
+  const harness = createHarness();
+  t.after(() => harness.close());
+
+  const results = await harness.service.upload([
+    harness.uploadFile("alpha.png", "alpha bytes"),
+    harness.uploadFile("beta.png", "beta bytes"),
+    harness.uploadFile("alpha-copy.png", "alpha bytes"),
+  ]);
+
+  assert.deepEqual(
+    results.map(({ created, duplicate }) => ({ created, duplicate })),
+    [
+      { created: true, duplicate: false },
+      { created: true, duplicate: false },
+      { created: false, duplicate: true },
+    ],
+  );
+  assert.equal(results[0].asset.id, results[2].asset.id);
+  assert.equal(harness.service.list().length, 2);
+  assert.equal(harness.imageProcessor.calls.length, 2);
+  assert.equal(harness.storage.objects.size, 6);
+});
+
+test("all new images are decoded before the batch mutates SQLite or storage", async (t) => {
+  const expected = Object.assign(new Error("bad second image"), {
+    code: "MALFORMED_IMAGE",
+    statusCode: 422,
+  });
+  let processCount = 0;
+  const regularProcessor = createFakeImageProcessor();
+  const harness = createHarness({
+    imageProcessor: {
+      async process(filename) {
+        processCount += 1;
+        if (processCount === 2) throw expected;
+        return regularProcessor.process(filename);
+      },
+    },
+  });
+  t.after(() => harness.close());
+
+  await assert.rejects(
+    harness.service.upload([
+      harness.uploadFile("valid.png", "valid"),
+      harness.uploadFile("broken.png", "broken"),
+    ]),
+    expected,
+  );
+  assert.equal(harness.service.list().length, 0);
+  assert.equal(harness.storage.objects.size, 0);
+  assert.equal(harness.storage.calls.length, 0);
+});
+
+test("concurrent identical uploads converge on one ready asset", async (t) => {
+  const storage = createMemoryStorage();
+  storage.setPutDelay(30);
+  const harness = createHarness({ storage });
+  t.after(() => harness.close());
+  const bytes = Buffer.from("racing identical upload");
+
+  const [[left], [right]] = await Promise.all([
+    harness.service.upload([harness.uploadFile("race.png", bytes)]),
+    harness.service.upload([harness.uploadFile("other-name.png", bytes)]),
+  ]);
+
+  assert.equal(harness.service.list().length, 1);
+  assert.equal(left.asset.id, right.asset.id);
+  assert.deepEqual([left.created, right.created].sort(), [false, true]);
+  assert.deepEqual([left.duplicate, right.duplicate].sort(), [false, true]);
+  assert.equal(storage.calls.filter((call) => call.operation === "put").length, 3);
+});
+
+test("a partial storage failure leaves a diagnosable failed row and no ready URLs", async (t) => {
+  const storage = createMemoryStorage();
+  storage.setPutFailure(new StorageUnavailableError(new Error("offline")), 1);
+  const harness = createHarness({ storage });
+  t.after(() => harness.close());
+
+  await assert.rejects(
+    harness.service.upload([harness.uploadFile("failure.png", "failure bytes")]),
+    (error) => {
+      assert.equal(error.statusCode, 503);
+      assert.equal(error.details.retryable, true);
+      assert.match(error.details.assetId, /^[0-9a-f-]{36}$/);
+      return true;
+    },
+  );
+
+  const [failed] = harness.service.list();
+  assert.equal(failed.status, "failed");
+  assert.match(failed.processingError, /^STORAGE_UNAVAILABLE:/);
+  assert.equal(failed.display.url, null);
+  assert.equal(failed.thumbnail.url, null);
+  assert.equal(failed.original.url, null);
+  assert.equal(storage.objects.size, 0);
+  const row = rawAsset(harness.database, failed.id);
+  assert.match(
+    row.original_object_key,
+    new RegExp(`^assets/${failed.id}/original/[0-9a-f]{64}$`),
+  );
+  assert.equal(
+    row.display_object_key,
+    `assets/${failed.id}/display/${row.display_sha256}.webp`,
+  );
+  assert.equal(
+    row.thumbnail_object_key,
+    `assets/${failed.id}/thumbnail/${row.thumbnail_sha256}.webp`,
+  );
+  assert.equal(storage.calls.filter((call) => call.operation === "put").length, 2);
+  assert.deepEqual(
+    new Set(
+      storage.calls
+        .filter((call) => call.operation === "delete")
+        .map((call) => call.key),
+    ),
+    new Set([
+      row.original_object_key,
+      row.display_object_key,
+      row.thumbnail_object_key,
+    ]),
+  );
+
+  await assert.rejects(
+    harness.service.upload([harness.uploadFile("retry.png", "failure bytes")]),
+    (error) => error.code === "ASSET_PROCESSING_FAILED" && error.statusCode === 409,
+  );
+
+  assert.deepEqual(await harness.service.remove(failed.id), {
+    id: failed.id,
+    deleted: true,
+  });
+  assert.equal(harness.service.list().length, 0);
+});
+
+test("rename and expiration edits change only approved SQLite metadata", async (t) => {
+  const harness = createHarness();
+  t.after(() => harness.close());
+  const [upload] = await harness.service.upload([
+    harness.uploadFile("editable.png", "editable bytes"),
+  ]);
+  const before = rawAsset(harness.database, upload.asset.id);
+
+  const expiring = harness.service.update(upload.asset.id, {
+    display_name: "  New   display name ",
+    expiration_at: "2035-05-06T07:08:09.000Z",
+  });
+  assert.equal(expiring.displayName, "New display name");
+  assert.equal(expiring.expirationAt, Date.parse("2035-05-06T07:08:09.000Z"));
+
+  const permanent = harness.service.update(upload.asset.id, { expirationAt: null });
+  assert.equal(permanent.expirationAt, null);
+  const after = rawAsset(harness.database, upload.asset.id);
+  assert.equal(after.original_object_key, before.original_object_key);
+  assert.equal(after.display_object_key, before.display_object_key);
+  assert.equal(after.thumbnail_object_key, before.thumbnail_object_key);
+  assert.equal(harness.storage.calls.filter((call) => call.operation === "put").length, 3);
+
+  await assert.rejects(
+    async () => harness.service.update(upload.asset.id, { status: "failed" }),
+    (error) => error.code === "INVALID_ASSET_UPDATE",
+  );
+  assert.throws(
+    () => harness.service.update(upload.asset.id, { expirationAt: -1 }),
+    (error) => error.code === "INVALID_ASSET_EXPIRATION",
+  );
+});
+
+test("references describe playlist, normal, and static use and block deletion", async (t) => {
+  const harness = createHarness();
+  t.after(() => harness.close());
+  const [upload] = await harness.service.upload([
+    harness.uploadFile("referenced.png", "referenced bytes"),
+  ]);
+  const id = upload.asset.id;
+  const now = 2_100_000_000_000;
+  harness.database
+    .prepare(
+      "INSERT INTO playlists (id, name, created_at, updated_at) VALUES (?, ?, ?, ?)",
+    )
+    .run("playlist-1", "Sunday", now, now);
+  harness.database
+    .prepare(
+      `INSERT INTO playlist_entries
+        (id, playlist_id, asset_id, enabled, position, created_at, updated_at)
+       VALUES (?, ?, ?, 1, 0, ?, ?)`,
+    )
+    .run("entry-1", "playlist-1", id, now, now);
+  harness.database
+    .prepare(
+      `UPDATE playback_state
+       SET active_playlist_id = ?, current_entry_id = ?, static_asset_id = ?, updated_at = ?
+       WHERE output_id = 'global'`,
+    )
+    .run("playlist-1", "entry-1", id, now);
+
+  const references = harness.service.references(id);
+  assert.equal(references.canDelete, false);
+  assert.deepEqual(references.blockerCodes, [
+    "PLAYLIST_REFERENCES",
+    "CURRENT_PLAYBACK_TARGET",
+    "CURRENT_STATIC_TARGET",
+  ]);
+  assert.deepEqual(references.playlists[0], {
+    playlistId: "playlist-1",
+    playlistName: "Sunday",
+    playlistEntryId: "entry-1",
+    enabled: true,
+    position: 0,
+    isActivePlaylist: true,
+    isCurrentNormalTarget: true,
+  });
+  assert.equal(references.playback[0].isCurrentNormalTarget, true);
+  assert.equal(references.playback[0].isCurrentStaticTarget, true);
+
+  const callsBeforeDelete = harness.storage.calls.length;
+  await assert.rejects(
+    harness.service.remove(id),
+    (error) => {
+      assert.equal(error.code, "ASSET_REFERENCED");
+      assert.equal(error.statusCode, 409);
+      assert.deepEqual(error.details.blockerCodes, [
+        "PLAYLIST_REFERENCES",
+        "CURRENT_PLAYBACK_TARGET",
+        "CURRENT_STATIC_TARGET",
+      ]);
+      return true;
+    },
+  );
+  assert.equal(harness.storage.calls.length, callsBeforeDelete);
+  assert.equal(rawAsset(harness.database, id).status, "ready");
+
+  harness.database
+    .prepare(
+      `UPDATE playback_state
+       SET active_playlist_id = NULL, current_entry_id = NULL, static_asset_id = NULL
+       WHERE output_id = 'global'`,
+    )
+    .run();
+  harness.database.prepare("DELETE FROM playlist_entries WHERE id = ?").run("entry-1");
+  assert.equal(harness.service.references(id).canDelete, true);
+  await harness.service.remove(id);
+  assert.equal(harness.storage.objects.size, 0);
+  assert.equal(rawAsset(harness.database, id), undefined);
+});
+
+test("failed storage deletion retains a retryable deleting row", async (t) => {
+  const storage = createMemoryStorage();
+  const harness = createHarness({ storage });
+  t.after(() => harness.close());
+  const [upload] = await harness.service.upload([
+    harness.uploadFile("delete-me.png", "delete me"),
+  ]);
+  storage.setDeleteFailure(new StorageUnavailableError(new Error("offline")));
+
+  await assert.rejects(harness.service.remove(upload.asset.id), (error) => {
+    assert.equal(error.statusCode, 503);
+    assert.equal(error.details.assetId, upload.asset.id);
+    assert.equal(error.details.retryable, true);
+    return true;
+  });
+  assert.equal(rawAsset(harness.database, upload.asset.id).status, "deleting");
+  assert.throws(
+    () => harness.service.update(upload.asset.id, { displayName: "Cannot edit" }),
+    (error) => error.code === "ASSET_DELETING",
+  );
+
+  await harness.service.remove(upload.asset.id);
+  assert.equal(rawAsset(harness.database, upload.asset.id), undefined);
+  assert.equal(storage.objects.size, 0);
+});
+
+test("processing assets cannot be deleted and storage is not touched", async (t) => {
+  const harness = createHarness();
+  t.after(() => harness.close());
+  const timestamp = Date.now();
+  harness.database
+    .prepare(
+      `INSERT INTO assets
+        (id, source_sha256, display_name, original_filename, status, created_at, updated_at)
+       VALUES (?, ?, ?, ?, 'processing', ?, ?)`,
+    )
+    .run(
+      "00000000-0000-4000-8000-999999999999",
+      "f".repeat(64),
+      "Still processing",
+      "processing.png",
+      timestamp,
+      timestamp,
+    );
+
+  assert.equal(
+    harness.service.references("00000000-0000-4000-8000-999999999999")
+      .canDelete,
+    false,
+  );
+  await assert.rejects(
+    harness.service.remove("00000000-0000-4000-8000-999999999999"),
+    (error) => error.code === "ASSET_PROCESSING" && error.statusCode === 409,
+  );
+  assert.equal(harness.storage.calls.length, 0);
+  assert.equal(
+    rawAsset(harness.database, "00000000-0000-4000-8000-999999999999").status,
+    "processing",
+  );
+});
+
+test("media descriptors only allow the recorded version and map missing bytes to 503", async (t) => {
+  const harness = createHarness();
+  t.after(() => harness.close());
+  const [upload] = await harness.service.upload([
+    harness.uploadFile("media.png", "media bytes"),
+  ]);
+  const { asset } = upload;
+
+  const display = harness.service.mediaDescriptor(
+    asset.id,
+    "display",
+    asset.display.sha256,
+  );
+  assert.equal(display.contentType, "image/webp");
+  assert.equal(display.contentLength, asset.display.byteSize);
+  const stored = await harness.service.readStoredObject(display);
+  assert.deepEqual(await bufferBody(stored.body), harness.storage.objects.get(display.key).body);
+
+  for (const requestedHash of ["a".repeat(64), "../original/key", "not-a-hash"]) {
+    assert.throws(
+      () => harness.service.mediaDescriptor(asset.id, "display", requestedHash),
+      (error) => error.code === "MEDIA_NOT_FOUND" && error.statusCode === 404,
+    );
+  }
+
+  harness.storage.objects.delete(display.key);
+  await assert.rejects(harness.service.readStoredObject(display), (error) => {
+    assert.equal(error.code, "STORAGE_INCONSISTENCY");
+    assert.equal(error.statusCode, 503);
+    assert.deepEqual(error.details, { assetId: asset.id, retryable: true });
+    return true;
+  });
+});

server/test/config.test.js

@@ -0,0 +1,128 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const { ConfigError, loadConfig, redactedConfig } = require("../src/config");
+
+function validEnvironment(overrides = {}) {
+  return {
+    NODE_ENV: "production",
+    HOST: "127.0.0.1",
+    PORT: "7532",
+    DATABASE_PATH: "/data/db/announcements.sqlite",
+    APP_TIMEZONE: "America/Chicago",
+    S3_ENDPOINT: "http://seaweedfs:8333",
+    S3_REGION: "us-east-1",
+    S3_BUCKET: "announcements",
+    S3_ACCESS_KEY_ID: "test-access-key",
+    S3_SECRET_ACCESS_KEY: "test-secret-key",
+    S3_FORCE_PATH_STYLE: "true",
+    MQTT_URL: "mqtt://broker:1883",
+    MQTT_USERNAME: "mqtt-user",
+    MQTT_PASSWORD: "mqtt-password",
+    HA_WEBHOOK_URL: "http://home-assistant:8123/api/webhook/example",
+    HA_WEBHOOK_SECRET: "webhook-secret",
+    ...overrides,
+  };
+}
+
+test("loadConfig validates and normalizes the supported environment", () => {
+  const config = loadConfig(validEnvironment());
+
+  assert.equal(config.environment, "production");
+  assert.equal(config.port, 7532);
+  assert.equal(config.timeZone, "America/Chicago");
+  assert.equal(config.storage.endpoint, "http://seaweedfs:8333");
+  assert.equal(config.storage.forcePathStyle, true);
+  assert.equal(config.storage.healthProbeIntervalMs, 30_000);
+  assert.equal(config.storage.connectionTimeoutMs, 2_000);
+  assert.equal(config.storage.requestTimeoutMs, 5_000);
+  assert.equal(config.storage.maxAttempts, 2);
+  assert.equal(config.processing.tempDirectory, "/tmp/announcements-uploads");
+  assert.equal(config.processing.maxFileBytes, 25 * 1024 * 1024);
+  assert.equal(config.processing.maxFiles, 20);
+  assert.equal(config.processing.maxInputPixels, 40_000_000);
+});
+
+test("production requires private S3 credentials", () => {
+  assert.throws(
+    () => loadConfig(validEnvironment({ S3_ACCESS_KEY_ID: "" })),
+    (error) =>
+      error instanceof ConfigError && error.field === "S3_ACCESS_KEY_ID",
+  );
+
+  const development = loadConfig(
+    validEnvironment({
+      NODE_ENV: "development",
+      S3_ACCESS_KEY_ID: "",
+      S3_SECRET_ACCESS_KEY: "",
+    }),
+  );
+  assert.equal(development.storage.accessKeyId, null);
+  assert.equal(development.storage.secretAccessKey, null);
+});
+
+test("loadConfig rejects invalid typed values", () => {
+  assert.throws(
+    () => loadConfig(validEnvironment({ PORT: "7532.5" })),
+    /PORT must be an integer/,
+  );
+  assert.throws(
+    () => loadConfig(validEnvironment({ APP_TIMEZONE: "Church/Local" })),
+    /valid IANA time zone/,
+  );
+  assert.throws(
+    () => loadConfig(validEnvironment({ S3_FORCE_PATH_STYLE: "sometimes" })),
+    /must be a boolean/,
+  );
+  assert.throws(
+    () => loadConfig(validEnvironment({ S3_HEALTH_PROBE_INTERVAL_MS: "999" })),
+    /S3_HEALTH_PROBE_INTERVAL_MS must be at least 1000/,
+  );
+  assert.throws(
+    () => loadConfig(validEnvironment({ S3_REQUEST_TIMEOUT_MS: "999" })),
+    /S3_REQUEST_TIMEOUT_MS must be at least 1000/,
+  );
+  assert.throws(
+    () => loadConfig(validEnvironment({ S3_CONNECT_TIMEOUT_MS: "249" })),
+    /S3_CONNECT_TIMEOUT_MS must be at least 250/,
+  );
+  assert.throws(
+    () => loadConfig(validEnvironment({ S3_MAX_ATTEMPTS: "6" })),
+    /S3_MAX_ATTEMPTS must be at most 5/,
+  );
+  assert.throws(
+    () => loadConfig(validEnvironment({ DATABASE_PATH: "relative.sqlite" })),
+    /must be an absolute path/,
+  );
+  assert.throws(
+    () => loadConfig(validEnvironment({ UPLOAD_TEMP_DIRECTORY: "relative" })),
+    /UPLOAD_TEMP_DIRECTORY must be an absolute path/,
+  );
+  assert.throws(
+    () => loadConfig(validEnvironment({ UPLOAD_MAX_FILE_BYTES: "0" })),
+    /UPLOAD_MAX_FILE_BYTES must be at least 1/,
+  );
+  assert.throws(
+    () => loadConfig(validEnvironment({ UPLOAD_MAX_FILES: "101" })),
+    /UPLOAD_MAX_FILES must be at most 100/,
+  );
+  assert.throws(
+    () => loadConfig(validEnvironment({ IMAGE_MAX_INPUT_PIXELS: "no-limit" })),
+    /IMAGE_MAX_INPUT_PIXELS must be an integer/,
+  );
+});
+
+test("redactedConfig never returns credentials, passwords, paths, or webhook URLs", () => {
+  const summary = redactedConfig(loadConfig(validEnvironment()));
+  const serialized = JSON.stringify(summary);
+
+  assert.equal(summary.storage.configured, true);
+  assert.equal(summary.mqtt.configured, true);
+  assert.equal(summary.notifications.configured, true);
+  assert.doesNotMatch(serialized, /test-access-key/);
+  assert.doesNotMatch(serialized, /test-secret-key/);
+  assert.doesNotMatch(serialized, /mqtt-password/);
+  assert.doesNotMatch(serialized, /webhook-secret/);
+  assert.doesNotMatch(serialized, /announcements\.sqlite/);
+  assert.doesNotMatch(serialized, /seaweedfs/);
+  assert.doesNotMatch(serialized, /home-assistant/);
+});

server/test/database.test.js

@@ -0,0 +1,275 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const fs = require("node:fs");
+const os = require("node:os");
+const path = require("node:path");
+const { openDatabase } = require("../src/database");
+const { migrationStatus, runMigrations } = require("../src/database/migrate");
+
+function migratedDatabase() {
+  const database = openDatabase({ path: ":memory:" });
+  const migrations = runMigrations(database);
+  return { database, migrations };
+}
+
+function columnNames(database, table) {
+  return database.pragma(`table_info(${table})`).map((column) => column.name);
+}
+
+test("initial migration creates every approved Phase 0 table and seed row", (t) => {
+  const { database, migrations } = migratedDatabase();
+  t.after(() => database.close());
+
+  const tables = database
+    .prepare(
+      `SELECT name FROM sqlite_master
+       WHERE type = 'table' AND name NOT LIKE 'sqlite_%'
+       ORDER BY name`,
+    )
+    .all()
+    .map((row) => row.name);
+
+  assert.deepEqual(tables, [
+    "app_settings",
+    "asset_import_sources",
+    "assets",
+    "display_clients",
+    "notification_incidents",
+    "notification_outbox",
+    "playback_state",
+    "playlist_entries",
+    "playlists",
+    "schema_migrations",
+  ]);
+  assert.equal(migrations.currentVersion, 1);
+  assert.equal(migrations.latestAvailableVersion, 1);
+  assert.deepEqual(migrations.pendingVersions, []);
+
+  assert.deepEqual(database.prepare("SELECT * FROM app_settings").get(), {
+    id: 1,
+    revision: 1,
+    default_duration_ms: 7000,
+    default_background_mode: "blurred",
+    default_solid_background_color: "#000000",
+    default_background_darkened: 0,
+    default_blur_px: 20,
+    crossfade_duration_ms: 1000,
+    updated_at: database.prepare("SELECT updated_at FROM app_settings").get()
+      .updated_at,
+  });
+
+  const playback = database.prepare("SELECT * FROM playback_state").get();
+  assert.equal(playback.output_id, "global");
+  assert.equal(playback.mode, "on");
+  assert.equal(playback.pending_playlist_id, null);
+  assert.equal(playback.pending_playlist_requested_at, null);
+  assert.ok(columnNames(database, "playlist_entries").includes(
+    "background_darkened_override",
+  ));
+});
+
+test("migrations are idempotent and report their status", (t) => {
+  const { database } = migratedDatabase();
+  t.after(() => database.close());
+
+  const rerun = runMigrations(database);
+  assert.equal(rerun.applied.length, 1);
+  assert.deepEqual(rerun.pendingVersions, []);
+  assert.deepEqual(migrationStatus(database), rerun);
+});
+
+test("a failed migration rolls back its schema and version record", (t) => {
+  const directory = fs.mkdtempSync(path.join(os.tmpdir(), "announcements-migrations-"));
+  const migrationPath = path.join(directory, "001_test.sql");
+  fs.writeFileSync(
+    migrationPath,
+    "CREATE TABLE should_roll_back (id INTEGER); THIS IS NOT SQL;",
+  );
+  const database = openDatabase({ path: ":memory:" });
+  t.after(() => {
+    database.close();
+    fs.rmSync(directory, { recursive: true, force: true });
+  });
+
+  assert.throws(() => runMigrations(database, directory));
+  assert.equal(
+    database
+      .prepare(
+        "SELECT COUNT(*) AS count FROM sqlite_master WHERE name = 'should_roll_back'",
+      )
+      .get().count,
+    0,
+  );
+  assert.equal(
+    database.prepare("SELECT COUNT(*) AS count FROM schema_migrations").get().count,
+    0,
+  );
+
+  fs.writeFileSync(migrationPath, "CREATE TABLE recovered (id INTEGER);");
+  const status = runMigrations(database, directory);
+  assert.equal(status.currentVersion, 1);
+  assert.equal(
+    database
+      .prepare("SELECT COUNT(*) AS count FROM sqlite_master WHERE name = 'recovered'")
+      .get().count,
+    1,
+  );
+});
+
+test("a library asset can occur only once in a given playlist", (t) => {
+  const { database } = migratedDatabase();
+  t.after(() => database.close());
+
+  const now = Date.now();
+  database
+    .prepare(
+      `INSERT INTO assets
+        (id, source_sha256, display_name, original_filename, status, created_at, updated_at)
+       VALUES (?, ?, ?, ?, 'ready', ?, ?)`,
+    )
+    .run("asset-1", "a".repeat(64), "Welcome", "welcome.png", now, now);
+  database
+    .prepare(
+      `INSERT INTO playlists (id, name, created_at, updated_at)
+       VALUES (?, ?, ?, ?)`,
+    )
+    .run("playlist-1", "Sunday", now, now);
+
+  const insert = database.prepare(
+    `INSERT INTO playlist_entries
+      (id, playlist_id, asset_id, position, created_at, updated_at)
+     VALUES (?, ?, ?, ?, ?, ?)`,
+  );
+  insert.run("entry-1", "playlist-1", "asset-1", 0, now, now);
+
+  assert.throws(
+    () => insert.run("entry-2", "playlist-1", "asset-1", 1, now, now),
+    /UNIQUE constraint failed/,
+  );
+
+  database
+    .prepare(
+      `INSERT INTO playlists (id, name, created_at, updated_at)
+       VALUES (?, ?, ?, ?)`,
+    )
+    .run("playlist-2", "Midweek", now, now);
+  assert.doesNotThrow(() =>
+    insert.run("entry-3", "playlist-2", "asset-1", 0, now, now),
+  );
+  assert.throws(
+    () => database.prepare("DELETE FROM assets WHERE id = 'asset-1'").run(),
+    /FOREIGN KEY constraint failed/,
+  );
+});
+
+test("darkening overrides accept inherited, off, and on only", (t) => {
+  const { database } = migratedDatabase();
+  t.after(() => database.close());
+
+  const now = Date.now();
+  database
+    .prepare(
+      `INSERT INTO playlists (id, name, created_at, updated_at)
+       VALUES ('playlist-1', 'Sunday', ?, ?)`,
+    )
+    .run(now, now);
+  const insertAsset = database.prepare(
+    `INSERT INTO assets
+      (id, source_sha256, display_name, original_filename, status, created_at, updated_at)
+     VALUES (?, ?, ?, ?, 'ready', ?, ?)`,
+  );
+  const insertEntry = database.prepare(
+    `INSERT INTO playlist_entries
+      (id, playlist_id, asset_id, background_darkened_override, position, created_at, updated_at)
+     VALUES (?, 'playlist-1', ?, ?, ?, ?, ?)`,
+  );
+
+  for (const [index, override] of [null, 0, 1].entries()) {
+    const assetId = `asset-${index}`;
+    insertAsset.run(
+      assetId,
+      String(index).repeat(64),
+      `Asset ${index}`,
+      `asset-${index}.png`,
+      now,
+      now,
+    );
+    assert.doesNotThrow(() =>
+      insertEntry.run(
+        `entry-${index}`,
+        assetId,
+        override,
+        index,
+        now,
+        now,
+      ),
+    );
+  }
+
+  insertAsset.run(
+    "asset-invalid",
+    "f".repeat(64),
+    "Invalid override",
+    "invalid.png",
+    now,
+    now,
+  );
+  assert.throws(
+    () => insertEntry.run("entry-invalid", "asset-invalid", 2, 3, now, now),
+    /CHECK constraint failed/,
+  );
+  assert.throws(
+    () =>
+      database
+        .prepare("UPDATE app_settings SET default_background_darkened = 2 WHERE id = 1")
+        .run(),
+    /CHECK constraint failed/,
+  );
+});
+
+test("pending playlist activation requires a playlist and request time together", (t) => {
+  const { database } = migratedDatabase();
+  t.after(() => database.close());
+
+  const now = Date.now();
+  database
+    .prepare(
+      `INSERT INTO playlists (id, name, created_at, updated_at)
+       VALUES ('playlist-1', 'Sunday', ?, ?)`,
+    )
+    .run(now, now);
+
+  assert.throws(
+    () =>
+      database
+        .prepare(
+          "UPDATE playback_state SET pending_playlist_id = 'playlist-1' WHERE output_id = 'global'",
+        )
+        .run(),
+    /CHECK constraint failed/,
+  );
+  assert.doesNotThrow(() =>
+    database
+      .prepare(
+        `UPDATE playback_state
+         SET pending_playlist_id = 'playlist-1', pending_playlist_requested_at = ?
+         WHERE output_id = 'global'`,
+      )
+      .run(now),
+  );
+  assert.throws(
+    () => database.prepare("DELETE FROM playlists WHERE id = 'playlist-1'").run(),
+    /FOREIGN KEY constraint failed/,
+  );
+  assert.throws(
+    () =>
+      database
+        .prepare(
+          `UPDATE playback_state
+           SET pending_playlist_id = 'missing', pending_playlist_requested_at = ?
+           WHERE output_id = 'global'`,
+        )
+        .run(now),
+    /FOREIGN KEY constraint failed/,
+  );
+});

server/test/eligibility.test.js

@@ -0,0 +1,218 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const {
+  ELIGIBILITY_REASONS,
+  evaluateEntryEligibility,
+  resolveEntrySettings,
+} = require("../src/lifecycle");
+
+const NOW = Date.parse("2035-05-06T07:08:09.000Z");
+
+function readyAsset(overrides = {}) {
+  return { status: "ready", expiration_at: null, ...overrides };
+}
+
+function enabledEntry(overrides = {}) {
+  return {
+    enabled: 1,
+    schedule_start_at: null,
+    schedule_end_at: null,
+    ...overrides,
+  };
+}
+
+test("an enabled, ready, permanent, unscheduled entry is playable", () => {
+  assert.deepEqual(
+    evaluateEntryEligibility(enabledEntry(), readyAsset(), NOW),
+    { playable: true, reason: null },
+  );
+});
+
+test("disabled entries are not playable", () => {
+  assert.deepEqual(
+    evaluateEntryEligibility(enabledEntry({ enabled: 0 }), readyAsset(), NOW),
+    { playable: false, reason: ELIGIBILITY_REASONS.DISABLED },
+  );
+});
+
+test("schedule start is inclusive", () => {
+  const entry = enabledEntry({ schedule_start_at: NOW });
+
+  assert.deepEqual(evaluateEntryEligibility(entry, readyAsset(), NOW - 1), {
+    playable: false,
+    reason: ELIGIBILITY_REASONS.SCHEDULED_FUTURE,
+  });
+  assert.deepEqual(evaluateEntryEligibility(entry, readyAsset(), NOW), {
+    playable: true,
+    reason: null,
+  });
+});
+
+test("schedule end is exclusive", () => {
+  const entry = enabledEntry({ schedule_end_at: NOW });
+
+  assert.deepEqual(evaluateEntryEligibility(entry, readyAsset(), NOW - 1), {
+    playable: true,
+    reason: null,
+  });
+  assert.deepEqual(evaluateEntryEligibility(entry, readyAsset(), NOW), {
+    playable: false,
+    reason: ELIGIBILITY_REASONS.SCHEDULED_ENDED,
+  });
+});
+
+test("start-only, end-only, and bounded schedules use UTC epoch milliseconds", () => {
+  assert.equal(
+    evaluateEntryEligibility(
+      enabledEntry({ schedule_start_at: NOW - 1 }),
+      readyAsset(),
+      NOW,
+    ).playable,
+    true,
+  );
+  assert.equal(
+    evaluateEntryEligibility(
+      enabledEntry({ schedule_end_at: NOW + 1 }),
+      readyAsset(),
+      NOW,
+    ).playable,
+    true,
+  );
+  assert.equal(
+    evaluateEntryEligibility(
+      enabledEntry({ schedule_start_at: NOW, schedule_end_at: NOW + 1 }),
+      readyAsset(),
+      NOW,
+    ).playable,
+    true,
+  );
+});
+
+test("only ready assets are playable", () => {
+  for (const status of ["processing", "failed", "deleting"]) {
+    assert.deepEqual(
+      evaluateEntryEligibility(enabledEntry(), readyAsset({ status }), NOW),
+      { playable: false, reason: ELIGIBILITY_REASONS.ASSET_NOT_READY },
+    );
+  }
+});
+
+test("permanent assets stay playable and expiration is exclusive", () => {
+  assert.equal(
+    evaluateEntryEligibility(enabledEntry(), readyAsset(), NOW).playable,
+    true,
+  );
+  assert.equal(
+    evaluateEntryEligibility(
+      enabledEntry(),
+      readyAsset({ expiration_at: NOW + 1 }),
+      NOW,
+    ).playable,
+    true,
+  );
+  assert.deepEqual(
+    evaluateEntryEligibility(
+      enabledEntry(),
+      readyAsset({ expiration_at: NOW }),
+      NOW,
+    ),
+    { playable: false, reason: ELIGIBILITY_REASONS.ASSET_EXPIRED },
+  );
+});
+
+test("not-playable reasons follow the documented precedence", () => {
+  const asset = readyAsset({ status: "failed", expiration_at: NOW });
+
+  assert.equal(
+    evaluateEntryEligibility(
+      enabledEntry({ enabled: 0, schedule_start_at: NOW + 1 }),
+      asset,
+      NOW,
+    ).reason,
+    ELIGIBILITY_REASONS.DISABLED,
+  );
+  assert.equal(
+    evaluateEntryEligibility(
+      enabledEntry({ schedule_start_at: NOW + 1, schedule_end_at: NOW }),
+      asset,
+      NOW,
+    ).reason,
+    ELIGIBILITY_REASONS.SCHEDULED_FUTURE,
+  );
+  assert.equal(
+    evaluateEntryEligibility(enabledEntry({ schedule_end_at: NOW }), asset, NOW)
+      .reason,
+    ELIGIBILITY_REASONS.SCHEDULED_ENDED,
+  );
+  assert.equal(
+    evaluateEntryEligibility(enabledEntry(), asset, NOW).reason,
+    ELIGIBILITY_REASONS.ASSET_NOT_READY,
+  );
+});
+
+test("mapped camel-case domain values are supported", () => {
+  assert.deepEqual(
+    evaluateEntryEligibility(
+      { enabled: true, scheduleStartAt: NOW, scheduleEndAt: NOW + 1 },
+      { status: "ready", expirationAt: NOW + 1 },
+      NOW,
+    ),
+    { playable: true, reason: null },
+  );
+});
+
+test("eligibility rejects invalid evaluation clocks", () => {
+  for (const invalid of [-1, 1.5, Number.MAX_SAFE_INTEGER + 1, "2035-01-01"]) {
+    assert.throws(
+      () => evaluateEntryEligibility(enabledEntry(), readyAsset(), invalid),
+      /nowMs must be a non-negative, safe epoch-millisecond integer/,
+    );
+  }
+});
+
+test("resolved settings inherit global duration and presentation", () => {
+  const settings = {
+    default_duration_ms: 7_000,
+    default_background_mode: "blurred",
+    default_solid_background_color: "#123456",
+    default_background_darkened: 1,
+    default_blur_px: 20,
+  };
+
+  assert.deepEqual(resolveEntrySettings({}, settings), {
+    durationMs: 7_000,
+    presentation: {
+      backgroundMode: "blurred",
+      backgroundColor: "#123456",
+      backgroundDarkened: true,
+      blurPx: 20,
+    },
+  });
+});
+
+test("entry overrides are independent and blur always remains global", () => {
+  const settings = {
+    defaultDurationMs: 7_000,
+    defaultBackgroundMode: "blurred",
+    defaultSolidBackgroundColor: "#123456",
+    defaultBackgroundDarkened: true,
+    defaultBlurPx: 20,
+  };
+  const entry = {
+    durationOverrideMs: 9_000,
+    backgroundModeOverride: "solid",
+    backgroundColorOverride: "#abcdef",
+    backgroundDarkenedOverride: false,
+    blurPx: 999,
+  };
+
+  assert.deepEqual(resolveEntrySettings(entry, settings), {
+    durationMs: 9_000,
+    presentation: {
+      backgroundMode: "solid",
+      backgroundColor: "#abcdef",
+      backgroundDarkened: false,
+      blurPx: 20,
+    },
+  });
+});

server/test/image-processing.test.js

@@ -0,0 +1,304 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const crypto = require("node:crypto");
+const fs = require("node:fs");
+const os = require("node:os");
+const path = require("node:path");
+const sharp = require("sharp");
+const {
+  DEFAULT_IMAGE_DERIVATIVE_OPTIONS,
+  ImageProcessingError,
+  createImageProcessor,
+} = require("../src/image-processing");
+
+const MAX_INPUT_PIXELS = 12_000_000;
+const CONTENT_TYPES = Object.freeze({
+  jpeg: "image/jpeg",
+  png: "image/png",
+  webp: "image/webp",
+});
+
+function createProcessor(overrides = {}) {
+  return createImageProcessor({
+    maxInputPixels: MAX_INPUT_PIXELS,
+    ...overrides,
+  });
+}
+
+function hash(buffer) {
+  return crypto.createHash("sha256").update(buffer).digest("hex");
+}
+
+async function solidImage(format, width, height, background = "#4a76b8") {
+  return sharp({
+    create: {
+      width,
+      height,
+      channels: 4,
+      background,
+    },
+  })
+    .toFormat(format)
+    .toBuffer();
+}
+
+async function twoFrameImage(format) {
+  const width = 20;
+  const frameHeight = 10;
+  const channels = 4;
+  const firstFrame = Buffer.alloc(width * frameHeight * channels);
+  const secondFrame = Buffer.alloc(width * frameHeight * channels);
+
+  for (let offset = 0; offset < firstFrame.length; offset += channels) {
+    firstFrame.set([255, 0, 0, 255], offset);
+    secondFrame.set([0, 0, 255, 255], offset);
+  }
+
+  const image = sharp(Buffer.concat([firstFrame, secondFrame]), {
+    raw: {
+      width,
+      height: frameHeight * 2,
+      channels,
+      pageHeight: frameHeight,
+    },
+  });
+
+  if (format === "tiff") {
+    return image.tiff().toBuffer();
+  }
+  return image[format]({ delay: [100, 100], loop: 0 }).toBuffer();
+}
+
+test("accepts decoded still JPEG, PNG, and WebP content", async (t) => {
+  const processor = createProcessor();
+
+  for (const format of ["jpeg", "png", "webp"]) {
+    await t.test(format, async () => {
+      const source = await solidImage(format, 640, 360);
+      const result = await processor.process(source);
+
+      assert.equal(result.original.format, format);
+      assert.equal(result.original.contentType, CONTENT_TYPES[format]);
+      assert.equal(result.original.byteSize, source.length);
+      assert.equal(result.original.sha256, hash(source));
+      assert.equal(result.original.width, 640);
+      assert.equal(result.original.height, 360);
+      assert.equal(result.original.pages, 1);
+
+      for (const derivative of [result.display, result.thumbnail]) {
+        assert.ok(Buffer.isBuffer(derivative.buffer));
+        assert.equal(derivative.format, "webp");
+        assert.equal(derivative.contentType, "image/webp");
+        assert.equal(derivative.byteSize, derivative.buffer.length);
+        assert.equal(derivative.sha256, hash(derivative.buffer));
+        assert.match(derivative.sha256, /^[0-9a-f]{64}$/);
+      }
+    });
+  }
+});
+
+test("uses bounding boxes without cropping or changing source aspect ratio", async () => {
+  const source = await solidImage("png", 3000, 1000);
+  const result = await createProcessor().process(source);
+
+  assert.deepEqual(
+    { width: result.display.width, height: result.display.height },
+    { width: 1920, height: 640 },
+  );
+  assert.deepEqual(
+    { width: result.thumbnail.width, height: result.thumbnail.height },
+    { width: 480, height: 160 },
+  );
+  assert.equal(result.display.width / result.display.height, 3);
+  assert.equal(result.thumbnail.width / result.thumbnail.height, 3);
+});
+
+test("does not enlarge a source that fits within both derivative bounds", async () => {
+  const source = await solidImage("jpeg", 320, 180);
+  const result = await createProcessor().process(source);
+
+  assert.deepEqual(
+    { width: result.display.width, height: result.display.height },
+    { width: 320, height: 180 },
+  );
+  assert.deepEqual(
+    { width: result.thumbnail.width, height: result.thumbnail.height },
+    { width: 320, height: 180 },
+  );
+});
+
+test("applies EXIF orientation and strips it from derivative metadata", async () => {
+  const source = await sharp({
+    create: {
+      width: 120,
+      height: 80,
+      channels: 3,
+      background: "#cb7235",
+    },
+  })
+    .jpeg()
+    .withMetadata({ orientation: 6 })
+    .toBuffer();
+
+  const result = await createProcessor().process(source);
+  const outputMetadata = await sharp(result.display.buffer).metadata();
+
+  assert.equal(result.original.orientation, 6);
+  assert.equal(result.original.encodedWidth, 120);
+  assert.equal(result.original.encodedHeight, 80);
+  assert.equal(result.original.width, 80);
+  assert.equal(result.original.height, 120);
+  assert.equal(result.display.width, 80);
+  assert.equal(result.display.height, 120);
+  assert.equal(outputMetadata.orientation, undefined);
+  assert.equal(outputMetadata.exif, undefined);
+});
+
+test("flattens transparent pixels against black in both derivatives", async () => {
+  const source = await solidImage("png", 40, 30, {
+    r: 255,
+    g: 0,
+    b: 0,
+    alpha: 0,
+  });
+  const result = await createProcessor().process(source);
+
+  assert.equal(result.original.hasAlpha, true);
+  for (const derivative of [result.display, result.thumbnail]) {
+    const metadata = await sharp(derivative.buffer).metadata();
+    const pixels = await sharp(derivative.buffer).raw().toBuffer();
+
+    assert.equal(metadata.hasAlpha, false);
+    assert.ok(
+      pixels.every((channel) => channel <= 2),
+      "fully transparent source pixels should become black",
+    );
+  }
+});
+
+test("supports a temporary file path without changing source identity", async (t) => {
+  const temporaryDirectory = fs.mkdtempSync(
+    path.join(os.tmpdir(), "announcements-image-processing-"),
+  );
+  t.after(() => fs.rmSync(temporaryDirectory, { recursive: true, force: true }));
+
+  const source = await solidImage("webp", 800, 600);
+  const filename = path.join(temporaryDirectory, "upload.tmp");
+  fs.writeFileSync(filename, source);
+
+  const result = await createProcessor().process(filename);
+  assert.equal(result.original.sha256, hash(source));
+  assert.equal(result.original.byteSize, source.length);
+  assert.equal(result.original.format, "webp");
+});
+
+test("rejects malformed and unsupported decoded content with typed errors", async () => {
+  const processor = createProcessor();
+  const gif = await solidImage("gif", 64, 64);
+
+  await assert.rejects(
+    processor.process(Buffer.from("not an image")),
+    (error) =>
+      error instanceof ImageProcessingError &&
+      error.code === "MALFORMED_IMAGE" &&
+      error.statusCode === 422,
+  );
+  await assert.rejects(
+    processor.process(gif),
+    (error) =>
+      error instanceof ImageProcessingError &&
+      error.code === "UNSUPPORTED_IMAGE_FORMAT" &&
+      error.statusCode === 415 &&
+      error.details.detectedFormat === "gif",
+  );
+});
+
+test("rejects animated WebP and GIF instead of selecting the first frame", async (t) => {
+  for (const format of ["webp", "gif"]) {
+    await t.test(format, async () => {
+      const animated = await twoFrameImage(format);
+      const metadata = await sharp(animated, { animated: true }).metadata();
+      assert.equal(metadata.pages, 2, "test fixture must contain two frames");
+      await assert.rejects(
+        createProcessor().process(animated),
+        (error) =>
+          error instanceof ImageProcessingError &&
+          error.code === "ANIMATED_IMAGE_NOT_SUPPORTED" &&
+          error.details.pages === 2,
+      );
+    });
+  }
+});
+
+test("rejects unexpected multipage inputs with a distinct typed error", async () => {
+  const multipageTiff = await twoFrameImage("tiff");
+  const metadata = await sharp(multipageTiff, { animated: true }).metadata();
+  assert.equal(metadata.pages, 2, "test fixture must contain two pages");
+
+  await assert.rejects(
+    createProcessor().process(multipageTiff),
+    (error) =>
+      error instanceof ImageProcessingError &&
+      error.code === "MULTIPAGE_IMAGE_NOT_SUPPORTED" &&
+      error.details.pages === 2,
+  );
+});
+
+test("enforces the injected decoded-pixel limit", async () => {
+  const source = await solidImage("png", 100, 100);
+  const processor = createImageProcessor({ maxInputPixels: 9_999 });
+
+  await assert.rejects(
+    processor.process(source),
+    (error) =>
+      error instanceof ImageProcessingError &&
+      error.code === "IMAGE_PIXEL_LIMIT_EXCEEDED" &&
+      error.statusCode === 413 &&
+      error.details.maxInputPixels === 9_999,
+  );
+});
+
+test("uses documented defaults while allowing validated target overrides", async () => {
+  assert.deepEqual(DEFAULT_IMAGE_DERIVATIVE_OPTIONS, {
+    display: { maxWidth: 1920, maxHeight: 1080, quality: 82 },
+    thumbnail: { maxWidth: 480, maxHeight: 270, quality: 72 },
+  });
+
+  const source = await solidImage("png", 900, 600);
+  const processor = createProcessor({
+    display: { maxWidth: 300, maxHeight: 300, quality: 90 },
+    thumbnail: { maxWidth: 100, maxHeight: 50, quality: 65 },
+  });
+  const result = await processor.process(source);
+
+  assert.deepEqual(
+    { width: result.display.width, height: result.display.height },
+    { width: 300, height: 200 },
+  );
+  assert.deepEqual(
+    { width: result.thumbnail.width, height: result.thumbnail.height },
+    { width: 75, height: 50 },
+  );
+  assert.throws(
+    () => createImageProcessor({ maxInputPixels: 0 }),
+    /maxInputPixels must be at least 1/,
+  );
+  assert.throws(
+    () =>
+      createImageProcessor({
+        maxInputPixels: 10_000,
+        display: { quality: 101 },
+      }),
+    /display\.quality must be at most 100/,
+  );
+});
+
+test("rejects invalid input interfaces with structured errors", async () => {
+  await assert.rejects(
+    createProcessor().process({ path: "/tmp/not-an-interface" }),
+    (error) =>
+      error instanceof ImageProcessingError &&
+      error.code === "INVALID_IMAGE_INPUT" &&
+      error.statusCode === 400,
+  );
+});

server/test/playback-api.test.js

@@ -0,0 +1,249 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const { createApp } = require("../src/app");
+const { loadConfig } = require("../src/config");
+const { openDatabase } = require("../src/database");
+const { runMigrations } = require("../src/database/migrate");
+
+function testConfig() {
+  return loadConfig({
+    NODE_ENV: "test",
+    HOST: "127.0.0.1",
+    PORT: "0",
+    DATABASE_PATH: ":memory:",
+    APP_TIMEZONE: "America/Chicago",
+    S3_ENDPOINT: "http://seaweedfs:8333",
+    S3_BUCKET: "announcements-test",
+  });
+}
+
+function createPlaybackStub({ domainError = null } = {}) {
+  const calls = [];
+  let revision = 10;
+  const snapshot = (action = "get") => ({
+    protocolVersion: 1,
+    outputId: "global",
+    playbackRevision: revision,
+    action,
+  });
+  const action = (name) => () => {
+    calls.push([name]);
+    revision += 1;
+    return snapshot(name);
+  };
+  return {
+    calls,
+    domainChanged(change) {
+      calls.push(["domainChanged", change]);
+      if (domainError) throw domainError;
+      return snapshot("domainChanged");
+    },
+    getSnapshot() {
+      calls.push(["getSnapshot"]);
+      return snapshot();
+    },
+    pause: action("pause"),
+    reconcile(reason) {
+      calls.push(["reconcile", reason]);
+      return snapshot("reconcile");
+    },
+    resume: action("resume"),
+    next: action("next"),
+    previous: action("previous"),
+    reload: action("reload"),
+    enterStatic(assetId) {
+      calls.push(["enterStatic", assetId]);
+      revision += 1;
+      return snapshot("static");
+    },
+    setMode(mode) {
+      calls.push(["setMode", mode]);
+      revision += 1;
+      return snapshot("mode");
+    },
+    activatePlaylist(playlistId) {
+      calls.push(["activatePlaylist", playlistId]);
+      revision += 1;
+      const current = snapshot("activate");
+      return {
+        activation: "active",
+        playlistId,
+        playback: { revision: current.playbackRevision },
+        snapshot: current,
+      };
+    },
+  };
+}
+
+async function createHarness(t, { domainError = null } = {}) {
+  const database = openDatabase({ path: ":memory:" });
+  const migrations = runMigrations(database);
+  const playbackService = createPlaybackStub({ domainError });
+  const invalidations = [];
+  const app = createApp({
+    config: testConfig(),
+    database,
+    imageProcessor: {},
+    lifecycle: { ready: true, stopping: false },
+    logger: { info() {}, warn() {}, error() {} },
+    migrations,
+    onPlaylistsChanged: (event) => invalidations.push(event),
+    playbackService,
+    storage: {
+      health() {
+        return { status: "healthy", checkedAt: null, lastSuccessAt: null };
+      },
+    },
+  });
+  const server = app.listen(0, "127.0.0.1");
+  await new Promise((resolve, reject) => {
+    server.once("listening", resolve);
+    server.once("error", reject);
+  });
+  t.after(async () => {
+    await new Promise((resolve) => server.close(resolve));
+    database.close();
+  });
+  return {
+    baseUrl: `http://127.0.0.1:${server.address().port}`,
+    database,
+    invalidations,
+    playbackService,
+  };
+}
+
+async function requestJson(baseUrl, path, { body, ...init } = {}) {
+  const response = await fetch(`${baseUrl}${path}`, {
+    ...init,
+    ...(body === undefined
+      ? {}
+      : {
+          headers: { "content-type": "application/json", ...init.headers },
+          body: JSON.stringify(body),
+        }),
+  });
+  return { response, body: await response.json() };
+}
+
+test("playback REST routes delegate every command to the one playback service", async (t) => {
+  const harness = await createHarness(t);
+
+  const read = await requestJson(harness.baseUrl, "/api/playback");
+  assert.equal(read.response.status, 200);
+  assert.equal(read.body.playbackRevision, 10);
+
+  const commands = [
+    ["POST", "/api/playback/pause", undefined, "pause"],
+    ["POST", "/api/playback/resume", undefined, "resume"],
+    ["POST", "/api/playback/next", undefined, "next"],
+    ["POST", "/api/playback/previous", undefined, "previous"],
+    ["POST", "/api/playback/reload", undefined, "reload"],
+    ["POST", "/api/playback/static", { assetId: "asset-static" }, "static"],
+    ["PUT", "/api/playback/mode", { mode: "off" }, "mode"],
+  ];
+  for (const [method, path, body, action] of commands) {
+    const result = await requestJson(harness.baseUrl, path, { method, body });
+    assert.equal(result.response.status, 200);
+    assert.equal(result.body.action, action);
+  }
+
+  assert.deepEqual(harness.playbackService.calls, [
+    ["getSnapshot"],
+    ["pause"],
+    ["resume"],
+    ["next"],
+    ["previous"],
+    ["reload"],
+    ["enterStatic", "asset-static"],
+    ["setMode", "off"],
+  ]);
+});
+
+test("playlist activation delegates directly to the playback authority", async (t) => {
+  const harness = await createHarness(t);
+  const result = await requestJson(
+    harness.baseUrl,
+    "/api/playlists/playlist-a/activate",
+    { method: "POST" },
+  );
+
+  assert.equal(result.response.status, 200);
+  assert.equal(result.body.activation, "active");
+  assert.equal(result.body.playlistId, "playlist-a");
+  assert.deepEqual(harness.playbackService.calls, [
+    ["activatePlaylist", "playlist-a"],
+  ]);
+  assert.deepEqual(harness.invalidations, []);
+});
+
+test("semantic domain edits reconcile playback independently of list invalidation", async (t) => {
+  const harness = await createHarness(t);
+  const timestamp = Date.now();
+  harness.database
+    .prepare(
+      `INSERT INTO assets (
+        id, source_sha256, display_name, original_filename, status,
+        created_at, updated_at
+      ) VALUES (?, ?, ?, ?, 'ready', ?, ?)`,
+    )
+    .run(
+      "unreferenced-asset",
+      "a".repeat(64),
+      "Unreferenced",
+      "unreferenced.png",
+      timestamp,
+      timestamp,
+    );
+
+  const settings = await requestJson(harness.baseUrl, "/api/settings", {
+    method: "PATCH",
+    body: { defaultBlurPx: 21 },
+  });
+  assert.equal(settings.response.status, 200);
+  const asset = await requestJson(
+    harness.baseUrl,
+    "/api/assets/unreferenced-asset",
+    { method: "PATCH", body: { displayName: "Renamed unreferenced" } },
+  );
+  assert.equal(asset.response.status, 200);
+
+  assert.deepEqual(harness.playbackService.calls, [
+    ["reconcile", "before_domain_change"],
+    [
+      "domainChanged",
+      { reason: "settings_updated", playlistIds: null, settingsRevision: 2 },
+    ],
+    ["reconcile", "before_domain_change"],
+    [
+      "domainChanged",
+      {
+        reason: "asset_updated",
+        playlistIds: [],
+        assetId: "unreferenced-asset",
+      },
+    ],
+  ]);
+  assert.deepEqual(harness.invalidations, [
+    { reason: "settings_updated", playlistIds: null, settingsRevision: 2 },
+  ]);
+});
+
+test("a playback reconciliation failure is surfaced after the domain commit", async (t) => {
+  const harness = await createHarness(t, {
+    domainError: new Error("reconciliation failed"),
+  });
+  const result = await requestJson(harness.baseUrl, "/api/playlists", {
+    method: "POST",
+    body: { name: "Committed before reconciliation" },
+  });
+
+  assert.equal(result.response.status, 500);
+  assert.equal(result.body.error.code, "INTERNAL_ERROR");
+  assert.equal(
+    harness.database.prepare("SELECT COUNT(*) AS count FROM playlists").get()
+      .count,
+    1,
+  );
+  assert.equal(harness.invalidations.length, 0);
+  assert.equal(harness.playbackService.calls[0][0], "domainChanged");
+});

server/test/playlists-api.test.js

@@ -0,0 +1,389 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const { createApp } = require("../src/app");
+const { loadConfig } = require("../src/config");
+const { openDatabase } = require("../src/database");
+const { runMigrations } = require("../src/database/migrate");
+
+const NOW = Date.parse("2032-04-05T12:00:00.000Z");
+
+const silentLogger = {
+  info() {},
+  warn() {},
+  error() {},
+};
+
+function testConfig() {
+  return loadConfig({
+    NODE_ENV: "test",
+    HOST: "127.0.0.1",
+    PORT: "0",
+    DATABASE_PATH: ":memory:",
+    APP_TIMEZONE: "America/Chicago",
+    S3_ENDPOINT: "http://seaweedfs:8333",
+    S3_BUCKET: "announcements-test",
+  });
+}
+
+function testStorage() {
+  return {
+    health() {
+      return {
+        status: "healthy",
+        checkedAt: new Date(NOW).toISOString(),
+        lastSuccessAt: new Date(NOW).toISOString(),
+      };
+    },
+  };
+}
+
+async function createHarness(t, { onPlaylistsChanged = () => {} } = {}) {
+  const config = testConfig();
+  const database = openDatabase({ path: ":memory:" });
+  const migrations = runMigrations(database);
+  const app = createApp({
+    config,
+    database,
+    imageProcessor: {},
+    lifecycle: { ready: true, stopping: false },
+    logger: silentLogger,
+    migrations,
+    now: () => NOW,
+    onPlaylistsChanged,
+    storage: testStorage(),
+  });
+  const server = app.listen(0, "127.0.0.1");
+  await new Promise((resolve, reject) => {
+    server.once("listening", resolve);
+    server.once("error", reject);
+  });
+  t.after(async () => {
+    await new Promise((resolve) => server.close(resolve));
+    database.close();
+  });
+  return {
+    baseUrl: `http://127.0.0.1:${server.address().port}`,
+    database,
+  };
+}
+
+function insertAsset(database, { id, name, status = "ready", expirationAt = null }) {
+  const hashCharacter = id.slice(-1).toLowerCase().replace(/[^0-9a-f]/g, "a");
+  database
+    .prepare(
+      `INSERT INTO assets (
+        id, source_sha256, display_name, original_filename, status,
+        expiration_at, created_at, updated_at
+      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
+    )
+    .run(
+      id,
+      hashCharacter.repeat(64),
+      name,
+      `${id}.png`,
+      status,
+      expirationAt,
+      NOW,
+      NOW,
+    );
+}
+
+async function jsonRequest(baseUrl, route, { body, ...init } = {}) {
+  const response = await fetch(`${baseUrl}${route}`, {
+    ...init,
+    ...(body === undefined
+      ? {}
+      : {
+          headers: { "content-type": "application/json", ...init.headers },
+          body: JSON.stringify(body),
+        }),
+  });
+  return { response, body: await response.json() };
+}
+
+test("playlist REST routes expose resolved entries, complete ordering, and structured errors", async (t) => {
+  const changes = [];
+  const harness = await createHarness(t, {
+    onPlaylistsChanged: (event) => changes.push(event),
+  });
+  insertAsset(harness.database, { id: "asset-a", name: "Welcome" });
+  insertAsset(harness.database, { id: "asset-b", name: "Events" });
+  insertAsset(harness.database, {
+    id: "asset-f",
+    name: "Failed upload",
+    status: "failed",
+  });
+
+  const created = await jsonRequest(harness.baseUrl, "/api/playlists", {
+    method: "POST",
+    body: { name: "Sunday" },
+  });
+  assert.equal(created.response.status, 201);
+  assert.match(created.body.id, /^[0-9a-f-]{36}$/);
+  assert.equal(created.body.revision, 1);
+  const playlistId = created.body.id;
+
+  const listed = await jsonRequest(harness.baseUrl, "/api/playlists");
+  assert.equal(listed.response.status, 200);
+  assert.deepEqual(listed.body.playlists.map((playlist) => playlist.id), [
+    playlistId,
+  ]);
+  assert.equal(changes.length, 1, "GET must not publish invalidation events");
+
+  const first = await jsonRequest(
+    harness.baseUrl,
+    `/api/playlists/${playlistId}/entries`,
+    {
+      method: "POST",
+      body: {
+        assetId: "asset-a",
+        durationOverrideMs: 9_000,
+        backgroundModeOverride: "solid",
+        backgroundColorOverride: "#123abc",
+        backgroundDarkenedOverride: true,
+      },
+    },
+  );
+  assert.equal(first.response.status, 201);
+  assert.equal(first.body.position, 0);
+  assert.equal(first.body.effectiveDurationMs, 9_000);
+  assert.equal(first.body.backgroundColorOverride, "#123ABC");
+  assert.deepEqual(first.body.eligibility, { playable: true, reason: null });
+
+  const second = await jsonRequest(
+    harness.baseUrl,
+    `/api/playlists/${playlistId}/entries`,
+    { method: "POST", body: { assetId: "asset-b" } },
+  );
+  assert.equal(second.response.status, 201);
+  assert.equal(second.body.position, 1);
+  assert.equal(second.body.effectiveDurationMs, 7_000);
+
+  const ordered = await jsonRequest(
+    harness.baseUrl,
+    `/api/playlists/${playlistId}/entries/order`,
+    {
+      method: "PUT",
+      body: { entryIds: [second.body.id, first.body.id] },
+    },
+  );
+  assert.equal(ordered.response.status, 200);
+  assert.deepEqual(
+    ordered.body.entries.map((entry) => [entry.id, entry.position]),
+    [
+      [second.body.id, 0],
+      [first.body.id, 1],
+    ],
+  );
+
+  const incomplete = await jsonRequest(
+    harness.baseUrl,
+    `/api/playlists/${playlistId}/entries/order`,
+    { method: "PUT", body: { entryIds: [first.body.id] } },
+  );
+  assert.equal(incomplete.response.status, 400);
+  assert.equal(incomplete.body.error.code, "PLAYLIST_ORDER_INCOMPLETE");
+  const unexpectedOrderField = await jsonRequest(
+    harness.baseUrl,
+    `/api/playlists/${playlistId}/entries/order`,
+    {
+      method: "PUT",
+      body: {
+        entryIds: [second.body.id, first.body.id],
+        appendMissing: false,
+      },
+    },
+  );
+  assert.equal(unexpectedOrderField.response.status, 400);
+  assert.equal(
+    unexpectedOrderField.body.error.code,
+    "INVALID_PLAYLIST_ORDER",
+  );
+  const missingOrderField = await jsonRequest(
+    harness.baseUrl,
+    `/api/playlists/${playlistId}/entries/order`,
+    { method: "PUT", body: {} },
+  );
+  assert.equal(missingOrderField.response.status, 400);
+  assert.equal(missingOrderField.body.error.code, "INVALID_PLAYLIST_ORDER");
+  const revisionAfterOrder = ordered.body.revision;
+
+  const duplicate = await jsonRequest(
+    harness.baseUrl,
+    `/api/playlists/${playlistId}/entries`,
+    { method: "POST", body: { assetId: "asset-a" } },
+  );
+  assert.equal(duplicate.response.status, 409);
+  assert.equal(duplicate.body.error.code, "PLAYLIST_ENTRY_EXISTS");
+
+  const failed = await jsonRequest(
+    harness.baseUrl,
+    `/api/playlists/${playlistId}/entries`,
+    { method: "POST", body: { assetId: "asset-f" } },
+  );
+  assert.equal(failed.response.status, 409);
+  assert.equal(failed.body.error.code, "ASSET_NOT_READY");
+
+  const missing = await jsonRequest(
+    harness.baseUrl,
+    "/api/playlists/not-a-playlist",
+  );
+  assert.equal(missing.response.status, 404);
+  assert.equal(missing.body.error.code, "PLAYLIST_NOT_FOUND");
+
+  const detail = await jsonRequest(
+    harness.baseUrl,
+    `/api/playlists/${playlistId}`,
+  );
+  assert.equal(detail.body.revision, revisionAfterOrder);
+  assert.equal(detail.body.entries.length, 2);
+
+  const patchedEntry = await jsonRequest(
+    harness.baseUrl,
+    `/api/playlists/${playlistId}/entries/${first.body.id}`,
+    {
+      method: "PATCH",
+      body: { enabled: false, durationOverrideMs: null },
+    },
+  );
+  assert.equal(patchedEntry.response.status, 200);
+  assert.equal(patchedEntry.body.enabled, false);
+  assert.equal(patchedEntry.body.effectiveDurationMs, 7_000);
+  assert.equal(patchedEntry.body.notPlayableReason, "disabled");
+
+  const removedEntry = await jsonRequest(
+    harness.baseUrl,
+    `/api/playlists/${playlistId}/entries/${second.body.id}`,
+    { method: "DELETE" },
+  );
+  assert.equal(removedEntry.response.status, 200);
+  assert.deepEqual(removedEntry.body, { id: second.body.id, deleted: true });
+  const compacted = await jsonRequest(
+    harness.baseUrl,
+    `/api/playlists/${playlistId}`,
+  );
+  assert.deepEqual(
+    compacted.body.entries.map((entry) => entry.position),
+    [0],
+  );
+
+  const temporary = await jsonRequest(harness.baseUrl, "/api/playlists", {
+    method: "POST",
+    body: { name: "Temporary" },
+  });
+  const deletedPlaylist = await jsonRequest(
+    harness.baseUrl,
+    `/api/playlists/${temporary.body.id}`,
+    { method: "DELETE" },
+  );
+  assert.equal(deletedPlaylist.response.status, 200);
+  assert.deepEqual(deletedPlaylist.body, {
+    id: temporary.body.id,
+    deleted: true,
+  });
+});
+
+test("playlist data invalidation fires once for semantic changes and not for reads, failures, or no-ops", async (t) => {
+  const changes = [];
+  const harness = await createHarness(t, {
+    onPlaylistsChanged: (event) => changes.push(event),
+  });
+  insertAsset(harness.database, { id: "asset-a", name: "Welcome" });
+  insertAsset(harness.database, { id: "asset-b", name: "Unused" });
+
+  const created = await jsonRequest(harness.baseUrl, "/api/playlists", {
+    method: "POST",
+    body: { name: "Sunday" },
+  });
+  const playlistId = created.body.id;
+  assert.equal(changes.length, 1);
+  assert.equal(changes[0].reason, "created");
+
+  await jsonRequest(harness.baseUrl, `/api/playlists/${playlistId}`);
+  await jsonRequest(harness.baseUrl, "/api/playlists", {
+    method: "POST",
+    body: { name: "sUNDAY" },
+  });
+  await jsonRequest(harness.baseUrl, `/api/playlists/${playlistId}`, {
+    method: "PATCH",
+    body: { name: "Sunday" },
+  });
+  assert.equal(changes.length, 1);
+
+  await jsonRequest(harness.baseUrl, `/api/playlists/${playlistId}`, {
+    method: "PATCH",
+    body: { name: "Weekend" },
+  });
+  assert.equal(changes.length, 2);
+  assert.equal(changes[1].reason, "renamed");
+
+  await jsonRequest(harness.baseUrl, "/api/settings", {
+    method: "PATCH",
+    body: { defaultDurationMs: 7_000 },
+  });
+  assert.equal(changes.length, 2);
+  await jsonRequest(harness.baseUrl, "/api/settings", {
+    method: "PATCH",
+    body: { defaultDurationMs: 8_000 },
+  });
+  assert.equal(changes.length, 3);
+  assert.deepEqual(changes[2], {
+    reason: "settings_updated",
+    playlistIds: null,
+    settingsRevision: 2,
+  });
+
+  await jsonRequest(harness.baseUrl, "/api/assets/asset-b", {
+    method: "PATCH",
+    body: { displayName: "Still unused" },
+  });
+  assert.equal(changes.length, 3);
+
+  await jsonRequest(
+    harness.baseUrl,
+    `/api/playlists/${playlistId}/entries`,
+    { method: "POST", body: { assetId: "asset-a" } },
+  );
+  assert.equal(changes.length, 4);
+  await jsonRequest(harness.baseUrl, "/api/assets/asset-a", {
+    method: "PATCH",
+    body: { expirationAt: NOW + 60_000 },
+  });
+  assert.deepEqual(changes.at(-1), {
+    reason: "asset_updated",
+    playlistIds: [playlistId],
+    assetId: "asset-a",
+  });
+  const countAfterAssetUpdate = changes.length;
+  await jsonRequest(harness.baseUrl, "/api/assets/asset-a", {
+    method: "PATCH",
+    body: { expirationAt: NOW + 60_000 },
+  });
+  assert.equal(changes.length, countAfterAssetUpdate);
+});
+
+test("a failing invalidation listener cannot turn a committed mutation into HTTP 500", async (t) => {
+  const harness = await createHarness(t, {
+    onPlaylistsChanged() {
+      throw new Error("listener unavailable");
+    },
+  });
+
+  const settings = await jsonRequest(harness.baseUrl, "/api/settings", {
+    method: "PATCH",
+    body: { defaultDurationMs: 8_000 },
+  });
+  assert.equal(settings.response.status, 200);
+  assert.equal(settings.body.revision, 2);
+
+  const playlist = await jsonRequest(harness.baseUrl, "/api/playlists", {
+    method: "POST",
+    body: { name: "Sunday" },
+  });
+  assert.equal(playlist.response.status, 201);
+  assert.equal(
+    harness.database.prepare("SELECT COUNT(*) AS count FROM playlists").get()
+      .count,
+    1,
+  );
+});

server/test/playlists-service.test.js

@@ -0,0 +1,706 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const crypto = require("node:crypto");
+const { openDatabase } = require("../src/database");
+const { runMigrations } = require("../src/database/migrate");
+const { createAssetService } = require("../src/assets/service");
+const { createPlaybackService } = require("../src/playback");
+const {
+  MAX_DURATION_MS,
+  MIN_DURATION_MS,
+  createPlaylistService,
+} = require("../src/playlists/service");
+
+const BASE_TIME = 2_000_000_000_000;
+
+function createHarness() {
+  const database = openDatabase({ path: ":memory:" });
+  runMigrations(database);
+  let clock = BASE_TIME;
+  let idCounter = 0;
+  let assetCounter = 0;
+  const changes = [];
+  let playbackService;
+  const service = createPlaylistService({
+    database,
+    now: () => clock,
+    createId: () =>
+      `00000000-0000-4000-8000-${String(++idCounter).padStart(12, "0")}`,
+    onBeforeChange: () => {
+      playbackService?.reconcile("before_domain_change");
+    },
+    onChanged: (change) => {
+      changes.push(change);
+      playbackService?.domainChanged(change);
+    },
+  });
+  playbackService = createPlaybackService({ database, now: () => clock });
+  playbackService.initialize();
+
+  function setNow(value) {
+    clock = value;
+  }
+
+  function seedAsset(options = {}) {
+    const sequence = ++assetCounter;
+    const id = options.id || `asset-${sequence}`;
+    const name = options.name || id;
+    const status = options.status || "ready";
+    const expirationAt = options.expirationAt ?? null;
+    const hash = crypto
+      .createHash("sha256")
+      .update(`${sequence}:${id}`)
+      .digest("hex");
+    database
+      .prepare(
+        `INSERT INTO assets (
+          id, source_sha256, display_name, original_filename, status,
+          expiration_at, display_sha256, display_width, display_height,
+          thumbnail_sha256, thumbnail_width, thumbnail_height,
+          created_at, updated_at
+        ) VALUES (?, ?, ?, ?, ?, ?, ?, 1920, 1080, ?, 480, 270, ?, ?)`,
+      )
+      .run(
+        id,
+        hash,
+        name,
+        `${name}.png`,
+        status,
+        expirationAt,
+        hash,
+        hash,
+        clock,
+        clock,
+      );
+    return id;
+  }
+
+  function playback() {
+    return database
+      .prepare("SELECT * FROM playback_state WHERE output_id = 'global'")
+      .get();
+  }
+
+  return {
+    changes,
+    database,
+    playback,
+    playbackService,
+    seedAsset,
+    service,
+    setNow,
+  };
+}
+
+function expectError(action, code, statusCode) {
+  assert.throws(action, (error) => {
+    assert.equal(error.code, code);
+    if (statusCode !== undefined) assert.equal(error.statusCode, statusCode);
+    return true;
+  });
+}
+
+test("playlist CRUD uses UUIDs, case-insensitive names, revisions, and post-commit events", (t) => {
+  const harness = createHarness();
+  t.after(() => harness.database.close());
+
+  const sunday = harness.service.create({ name: "  Sunday   Service  " });
+  const midweek = harness.service.create({ name: "Midweek" });
+  assert.match(sunday.id, /^[0-9a-f-]{36}$/);
+  assert.equal(sunday.name, "Sunday Service");
+  assert.equal(sunday.revision, 1);
+  assert.deepEqual(
+    harness.service.list().map((playlist) => playlist.name),
+    ["Midweek", "Sunday Service"],
+  );
+
+  const revisionBeforeRead = harness.service.list()[1].revision;
+  const changesBeforeRead = harness.changes.length;
+  assert.equal(harness.service.get(sunday.id).entries.length, 0);
+  assert.equal(harness.service.list()[1].revision, revisionBeforeRead);
+  assert.equal(harness.changes.length, changesBeforeRead);
+
+  const renamed = harness.service.update(sunday.id, { name: "Sunday Worship" });
+  assert.equal(renamed.revision, 2);
+  assert.equal(harness.service.update(sunday.id, { name: "Sunday Worship" }).revision, 2);
+  expectError(
+    () => harness.service.create({ name: "sUnDaY wOrShIp" }),
+    "PLAYLIST_NAME_CONFLICT",
+    409,
+  );
+  expectError(
+    () => harness.service.update(midweek.id, { name: "SUNDAY WORSHIP" }),
+    "PLAYLIST_NAME_CONFLICT",
+    409,
+  );
+  assert.equal(harness.service.get(midweek.id).revision, 1);
+
+  assert.deepEqual(harness.service.remove(midweek.id), {
+    id: midweek.id,
+    deleted: true,
+  });
+  expectError(
+    () => harness.service.get(midweek.id),
+    "PLAYLIST_NOT_FOUND",
+    404,
+  );
+  assert.deepEqual(
+    harness.changes.map((change) => change.reason),
+    ["created", "created", "renamed", "deleted"],
+  );
+});
+
+test("active and pending playlists are conservatively protected from deletion", (t) => {
+  const harness = createHarness();
+  t.after(() => harness.database.close());
+  const active = harness.service.create({ name: "Active" });
+  const pending = harness.service.create({ name: "Pending" });
+  harness.service.addEntry(active.id, {
+    assetId: harness.seedAsset({ id: "held", name: "Held" }),
+  });
+  harness.service.addEntry(pending.id, {
+    assetId: harness.seedAsset({ id: "queued", name: "Queued" }),
+  });
+
+  // A mid-duration normal slide is what keeps an activation genuinely pending.
+  // With no playable normal target the authority promotes the request straight
+  // away, so an activation cannot be left queued behind an empty playlist.
+  harness.playbackService.activatePlaylist(active.id);
+  assert.equal(
+    harness.playbackService.activatePlaylist(pending.id).activation,
+    "pending",
+  );
+
+  expectError(() => harness.service.remove(active.id), "PLAYLIST_ACTIVE", 409);
+  expectError(
+    () => harness.service.remove(pending.id),
+    "PLAYLIST_PENDING_ACTIVATION",
+    409,
+  );
+  assert.equal(harness.playback().active_playlist_id, active.id);
+  assert.equal(harness.playback().pending_playlist_id, pending.id);
+  assert.equal(harness.service.list().length, 2);
+});
+
+test("entry adds require a ready, unexpired asset and enforce one occurrence per playlist", (t) => {
+  const harness = createHarness();
+  t.after(() => harness.database.close());
+  const first = harness.service.create({ name: "First" });
+  const second = harness.service.create({ name: "Second" });
+  const ready = harness.seedAsset({ id: "ready", name: "Ready" });
+  for (const status of ["processing", "failed", "deleting"]) {
+    harness.seedAsset({ id: status, name: status, status });
+  }
+  harness.seedAsset({
+    id: "expired",
+    name: "Expired",
+    expirationAt: BASE_TIME,
+  });
+
+  const firstEntry = harness.service.addEntry(first.id, { assetId: ready });
+  const secondEntry = harness.service.addEntry(second.id, { assetId: ready });
+  assert.equal(firstEntry.position, 0);
+  assert.equal(secondEntry.position, 0);
+  assert.notEqual(firstEntry.id, secondEntry.id);
+  expectError(
+    () => harness.service.addEntry(first.id, { assetId: ready }),
+    "PLAYLIST_ENTRY_EXISTS",
+    409,
+  );
+  for (const status of ["processing", "failed", "deleting"]) {
+    expectError(
+      () => harness.service.addEntry(first.id, { assetId: status }),
+      "ASSET_NOT_READY",
+      409,
+    );
+  }
+  expectError(
+    () => harness.service.addEntry(first.id, { assetId: "missing" }),
+    "ASSET_NOT_FOUND",
+    404,
+  );
+  expectError(
+    () => harness.service.addEntry(first.id, { assetId: "expired" }),
+    "ASSET_EXPIRED",
+    409,
+  );
+  assert.equal(harness.service.get(first.id).revision, 2);
+});
+
+test("entry enablement, duration, and presentation overrides are playlist-local", (t) => {
+  const harness = createHarness();
+  t.after(() => harness.database.close());
+  const a = harness.service.create({ name: "A" });
+  const b = harness.service.create({ name: "B" });
+  const assetId = harness.seedAsset({ id: "shared", name: "Shared" });
+  const entryA = harness.service.addEntry(a.id, { assetId });
+  const entryB = harness.service.addEntry(b.id, { assetId });
+
+  assert.equal(entryA.durationOverrideMs, null);
+  assert.equal(entryA.effectiveDurationMs, 7000);
+  assert.deepEqual(entryA.effectivePresentation, {
+    backgroundMode: "blurred",
+    backgroundColor: "#000000",
+    backgroundDarkened: false,
+    blurPx: 20,
+  });
+
+  const patched = harness.service.updateEntry(a.id, entryA.id, {
+    enabled: false,
+    durationOverrideMs: 4000,
+    backgroundModeOverride: "solid",
+    backgroundColorOverride: "#a1b2c3",
+    backgroundDarkenedOverride: true,
+  });
+  assert.equal(patched.enabled, false);
+  assert.equal(patched.effectiveDurationMs, 4000);
+  assert.deepEqual(patched.effectivePresentation, {
+    backgroundMode: "solid",
+    backgroundColor: "#A1B2C3",
+    backgroundDarkened: true,
+    blurPx: 20,
+  });
+  assert.equal(harness.service.get(b.id).entries[0].enabled, true);
+  assert.equal(harness.service.get(b.id).entries[0].effectiveDurationMs, 7000);
+  assert.equal(
+    harness.database.prepare("SELECT status FROM assets WHERE id = ?").get(assetId)
+      .status,
+    "ready",
+  );
+
+  const inheritedAgain = harness.service.updateEntry(a.id, entryA.id, {
+    durationOverrideMs: null,
+    backgroundModeOverride: null,
+    backgroundColorOverride: null,
+    backgroundDarkenedOverride: null,
+  });
+  assert.equal(inheritedAgain.effectiveDurationMs, 7000);
+  assert.equal(inheritedAgain.backgroundDarkenedOverride, null);
+
+  for (const invalid of [MIN_DURATION_MS - 1, MAX_DURATION_MS + 1, 1.5]) {
+    expectError(
+      () =>
+        harness.service.updateEntry(a.id, entryA.id, {
+          durationOverrideMs: invalid,
+        }),
+      "INVALID_PLAYLIST_ENTRY",
+      400,
+    );
+  }
+  for (const patch of [
+    { backgroundModeOverride: "gradient" },
+    { backgroundColorOverride: "red" },
+    { backgroundDarkenedOverride: 1 },
+  ]) {
+    expectError(
+      () => harness.service.updateEntry(a.id, entryA.id, patch),
+      "INVALID_PLAYLIST_ENTRY",
+      400,
+    );
+  }
+  assert.equal(harness.service.get(a.id).revision, 4);
+  assert.equal(harness.service.get(b.id).revision, 2);
+  assert.equal(entryB.enabled, true);
+});
+
+test("resolved entries centralize schedule and expiration eligibility at exact boundaries", (t) => {
+  const harness = createHarness();
+  t.after(() => harness.database.close());
+  const playlist = harness.service.create({ name: "Scheduled" });
+  const permanent = harness.seedAsset({ id: "permanent", name: "Permanent" });
+  const futureExpiry = harness.seedAsset({
+    id: "future-expiry",
+    name: "Future expiry",
+    expirationAt: BASE_TIME + 20_000,
+  });
+  const noSchedule = harness.service.addEntry(playlist.id, { assetId: permanent });
+  const bounded = harness.service.addEntry(playlist.id, {
+    assetId: futureExpiry,
+    scheduleStartAt: BASE_TIME + 10_000,
+    scheduleEndAt: BASE_TIME + 30_000,
+  });
+
+  let detail = harness.service.get(playlist.id);
+  assert.equal(detail.evaluatedAt, BASE_TIME);
+  assert.equal(detail.settingsRevision, 1);
+  assert.deepEqual(
+    detail.entries.map((entry) => [entry.id, entry.playable, entry.notPlayableReason]),
+    [
+      [noSchedule.id, true, null],
+      [bounded.id, false, "scheduled_future"],
+    ],
+  );
+
+  harness.setNow(BASE_TIME + 10_000);
+  assert.equal(harness.service.get(playlist.id).entries[1].playable, true);
+  harness.setNow(BASE_TIME + 20_000);
+  assert.equal(
+    harness.service.get(playlist.id).entries[1].notPlayableReason,
+    "asset_expired",
+  );
+  harness.setNow(BASE_TIME + 30_000);
+  assert.equal(
+    harness.service.get(playlist.id).entries[1].notPlayableReason,
+    "scheduled_ended",
+  );
+
+  harness.setNow(BASE_TIME);
+  const endOnlyAsset = harness.seedAsset({ id: "end-only", name: "End only" });
+  const endOnly = harness.service.addEntry(playlist.id, {
+    assetId: endOnlyAsset,
+    scheduleEndAt: BASE_TIME + 1,
+  });
+  assert.equal(endOnly.playable, true);
+  harness.setNow(BASE_TIME + 1);
+  assert.equal(
+    harness.service.get(playlist.id).entries.find((entry) => entry.id === endOnly.id)
+      .notPlayableReason,
+    "scheduled_ended",
+  );
+
+  expectError(
+    () =>
+      harness.service.updateEntry(playlist.id, noSchedule.id, {
+        scheduleStartAt: BASE_TIME + 2,
+        scheduleEndAt: BASE_TIME + 1,
+      }),
+    "INVALID_PLAYLIST_ENTRY_SCHEDULE",
+    400,
+  );
+  expectError(
+    () =>
+      harness.service.updateEntry(playlist.id, noSchedule.id, {
+        scheduleStartAt: "2033-05-18T03:33:20",
+      }),
+    "INVALID_PLAYLIST_ENTRY",
+    400,
+  );
+  const iso = harness.service.updateEntry(playlist.id, noSchedule.id, {
+    scheduleStartAt: "2033-05-18T03:33:20Z",
+  });
+  assert.equal(iso.scheduleStartAt, 2_000_000_000_000);
+});
+
+test("full-list reorder validates membership and persists contiguous zero-based positions", (t) => {
+  const harness = createHarness();
+  t.after(() => harness.database.close());
+  const playlist = harness.service.create({ name: "Ordered" });
+  const other = harness.service.create({ name: "Other" });
+  const entries = ["one", "two", "three"].map((id) =>
+    harness.service.addEntry(playlist.id, {
+      assetId: harness.seedAsset({ id, name: id }),
+    }),
+  );
+  const foreign = harness.service.addEntry(other.id, {
+    assetId: harness.seedAsset({ id: "foreign", name: "foreign" }),
+  });
+  const revision = harness.service.get(playlist.id).revision;
+
+  const reordered = harness.service.reorderEntries(
+    playlist.id,
+    [entries[2].id, entries[0].id, entries[1].id],
+  );
+  assert.deepEqual(
+    reordered.entries.map((entry) => [entry.id, entry.position]),
+    [
+      [entries[2].id, 0],
+      [entries[0].id, 1],
+      [entries[1].id, 2],
+    ],
+  );
+  assert.equal(reordered.revision, revision + 1);
+
+  const failedRevision = reordered.revision;
+  expectError(
+    () =>
+      harness.service.reorderEntries(playlist.id, [
+        entries[2].id,
+        entries[2].id,
+        entries[1].id,
+      ]),
+    "PLAYLIST_ORDER_DUPLICATE_IDS",
+  );
+  expectError(
+    () => harness.service.reorderEntries(playlist.id, [entries[2].id]),
+    "PLAYLIST_ORDER_INCOMPLETE",
+  );
+  expectError(
+    () =>
+      harness.service.reorderEntries(playlist.id, [
+        entries[2].id,
+        entries[0].id,
+        foreign.id,
+      ]),
+    "PLAYLIST_ORDER_FOREIGN_ENTRY",
+  );
+  expectError(
+    () =>
+      harness.service.reorderEntries(playlist.id, [
+        entries[2].id,
+        entries[0].id,
+        "missing-entry",
+      ]),
+    "PLAYLIST_ORDER_UNKNOWN_ENTRY",
+  );
+  assert.equal(harness.service.get(playlist.id).revision, failedRevision);
+
+  harness.service.removeEntry(playlist.id, entries[0].id);
+  assert.deepEqual(
+    harness.service.get(playlist.id).entries.map((entry) => entry.position),
+    [0, 1],
+  );
+});
+
+test("no-op and failed mutations do not increment revisions or emit invalidations", (t) => {
+  const harness = createHarness();
+  t.after(() => harness.database.close());
+  const playlist = harness.service.create({ name: "Stable" });
+  const entry = harness.service.addEntry(playlist.id, {
+    assetId: harness.seedAsset({ id: "stable-asset", name: "Stable asset" }),
+  });
+  const baseline = harness.service.get(playlist.id).revision;
+  const eventCount = harness.changes.length;
+
+  harness.service.update(playlist.id, { name: "Stable" });
+  harness.service.updateEntry(playlist.id, entry.id, { enabled: true });
+  harness.service.reorderEntries(playlist.id, [entry.id]);
+  expectError(
+    () => harness.service.updateEntry(playlist.id, "missing", { enabled: false }),
+    "PLAYLIST_ENTRY_NOT_FOUND",
+    404,
+  );
+  assert.equal(harness.service.get(playlist.id).revision, baseline);
+  assert.equal(harness.changes.length, eventCount);
+});
+
+test("entry references protect assets and final removal restores delete eligibility", (t) => {
+  const harness = createHarness();
+  t.after(() => harness.database.close());
+  const playlist = harness.service.create({ name: "References" });
+  const assetId = harness.seedAsset({ id: "referenced", name: "Referenced" });
+  const entry = harness.service.addEntry(playlist.id, { assetId, enabled: false });
+  const assetService = createAssetService({
+    database: harness.database,
+    storage: {},
+    imageProcessor: {},
+  });
+
+  const referenced = assetService.references(assetId);
+  assert.equal(referenced.canDelete, false);
+  assert.equal(referenced.playlists[0].playlistEntryId, entry.id);
+  harness.service.removeEntry(playlist.id, entry.id);
+  assert.equal(assetService.references(assetId).canDelete, true);
+});
+
+test("activation queues at a live boundary, is idempotent, and mode off is only a gate", (t) => {
+  const harness = createHarness();
+  t.after(() => harness.database.close());
+  const oldPlaylist = harness.service.create({ name: "Old" });
+  const newPlaylist = harness.service.create({ name: "New" });
+  const oldEntry = harness.service.addEntry(oldPlaylist.id, {
+    assetId: harness.seedAsset({ id: "old-asset", name: "Old asset" }),
+  });
+  const newEntry = harness.service.addEntry(newPlaylist.id, {
+    assetId: harness.seedAsset({ id: "new-asset", name: "New asset" }),
+    durationOverrideMs: 4000,
+  });
+
+  const initial = harness.playbackService.activatePlaylist(oldPlaylist.id);
+  assert.equal(initial.activation, "active");
+  assert.equal(initial.playback.currentEntryId, oldEntry.id);
+  assert.equal(initial.playback.slideStartedAt, BASE_TIME);
+  assert.equal(initial.playback.nextSlideAt, BASE_TIME + 7000);
+
+  harness.database
+    .prepare("UPDATE playback_state SET mode = 'off' WHERE output_id = 'global'")
+    .run();
+  harness.setNow(BASE_TIME + 1000);
+  const pending = harness.playbackService.activatePlaylist(newPlaylist.id);
+  assert.equal(pending.activation, "pending");
+  assert.equal(pending.playback.mode, "off");
+  assert.equal(pending.playback.activePlaylistId, oldPlaylist.id);
+  assert.equal(pending.playback.pendingPlaylistId, newPlaylist.id);
+  assert.equal(pending.playback.currentEntryId, oldEntry.id);
+  const pendingRevision = pending.playback.revision;
+  const requestedAt = pending.playback.pendingPlaylistRequestedAt;
+
+  const repeated = harness.playbackService.activatePlaylist(newPlaylist.id);
+  assert.equal(repeated.activation, "pending");
+  assert.equal(repeated.playback.revision, pendingRevision);
+  assert.equal(repeated.playback.pendingPlaylistRequestedAt, requestedAt);
+
+  const cancel = harness.playbackService.activatePlaylist(oldPlaylist.id);
+  assert.equal(cancel.activation, "already_active");
+  assert.equal(cancel.playback.pendingPlaylistId, null);
+  assert.equal(cancel.playback.currentEntryId, oldEntry.id);
+
+  harness.setNow(BASE_TIME + 7000);
+  const immediate = harness.playbackService.activatePlaylist(newPlaylist.id);
+  assert.equal(immediate.activation, "active");
+  assert.equal(immediate.playback.activePlaylistId, newPlaylist.id);
+  assert.equal(immediate.playback.pendingPlaylistId, null);
+  assert.equal(immediate.playback.currentEntryId, newEntry.id);
+  assert.equal(immediate.playback.slideStartedAt, BASE_TIME + 7000);
+  assert.equal(immediate.playback.nextSlideAt, BASE_TIME + 11_000);
+  assert.equal(immediate.playback.mode, "off");
+});
+
+test("paused normal playback queues and can replace a pending activation", (t) => {
+  const harness = createHarness();
+  t.after(() => harness.database.close());
+  const current = harness.service.create({ name: "Paused current" });
+  const firstTarget = harness.service.create({ name: "First target" });
+  const secondTarget = harness.service.create({ name: "Second target" });
+  harness.service.addEntry(current.id, {
+    assetId: harness.seedAsset({ id: "paused-current", name: "Paused current" }),
+  });
+  harness.service.addEntry(firstTarget.id, {
+    assetId: harness.seedAsset({ id: "first-target", name: "First target" }),
+  });
+  harness.service.addEntry(secondTarget.id, {
+    assetId: harness.seedAsset({ id: "second-target", name: "Second target" }),
+  });
+  harness.playbackService.activatePlaylist(current.id);
+  harness.database
+    .prepare(
+      `UPDATE playback_state
+       SET rotation_paused = 1, paused_remaining_ms = 5000,
+           slide_started_at = NULL, next_slide_at = NULL
+       WHERE output_id = 'global'`,
+    )
+    .run();
+
+  harness.setNow(BASE_TIME + 1000);
+  const first = harness.playbackService.activatePlaylist(firstTarget.id);
+  assert.equal(first.activation, "pending");
+  assert.equal(first.playback.activePlaylistId, current.id);
+  assert.equal(first.playback.pendingPlaylistId, firstTarget.id);
+  assert.equal(first.playback.pausedRemainingMs, 5000);
+
+  harness.setNow(BASE_TIME + 2000);
+  const replacement = harness.playbackService.activatePlaylist(secondTarget.id);
+  assert.equal(replacement.activation, "pending");
+  assert.equal(replacement.playback.activePlaylistId, current.id);
+  assert.equal(replacement.playback.pendingPlaylistId, secondTarget.id);
+  assert.equal(replacement.playback.pendingPlaylistRequestedAt, BASE_TIME + 2000);
+  assert.equal(replacement.playback.revision, first.playback.revision + 1);
+  assert.equal(replacement.playback.pausedRemainingMs, 5000);
+});
+
+test("static and paused activation prepare the first playable normal target without breaking hold", (t) => {
+  const harness = createHarness();
+  t.after(() => harness.database.close());
+  const oldPlaylist = harness.service.create({ name: "Old static" });
+  const target = harness.service.create({ name: "Target static" });
+  const staticAssetId = harness.seedAsset({ id: "static", name: "Static" });
+  harness.service.addEntry(oldPlaylist.id, {
+    assetId: harness.seedAsset({ id: "old-normal", name: "Old normal" }),
+  });
+  const skipped = harness.service.addEntry(target.id, {
+    assetId: harness.seedAsset({ id: "disabled", name: "Disabled" }),
+    enabled: false,
+  });
+  const firstPlayable = harness.service.addEntry(target.id, {
+    assetId: harness.seedAsset({ id: "playable", name: "Playable" }),
+    durationOverrideMs: 9000,
+  });
+  assert.equal(skipped.position, 0);
+  harness.playbackService.activatePlaylist(oldPlaylist.id);
+  harness.database
+    .prepare(
+      `UPDATE playback_state
+       SET static_asset_id = ?, rotation_paused = 1,
+           paused_remaining_ms = 1234, slide_started_at = NULL,
+           next_slide_at = NULL
+       WHERE output_id = 'global'`,
+    )
+    .run(staticAssetId);
+
+  const result = harness.playbackService.activatePlaylist(target.id);
+  assert.equal(result.activation, "active");
+  assert.equal(result.playback.activePlaylistId, target.id);
+  assert.equal(result.playback.staticAssetId, staticAssetId);
+  assert.equal(result.playback.rotationPaused, true);
+  assert.equal(result.playback.currentEntryId, firstPlayable.id);
+  assert.equal(result.playback.pausedRemainingMs, 9000);
+  assert.equal(result.playback.slideStartedAt, null);
+  assert.equal(result.playback.nextSlideAt, null);
+});
+
+test("empty activation is immediate and current-entry deletion coordinates playback revision safely", (t) => {
+  const harness = createHarness();
+  t.after(() => harness.database.close());
+  const populated = harness.service.create({ name: "Populated" });
+  const empty = harness.service.create({ name: "Empty" });
+  const entries = ["first", "second"].map((id) =>
+    harness.service.addEntry(populated.id, {
+      assetId: harness.seedAsset({ id: `asset-${id}`, name: id }),
+    }),
+  );
+  harness.playbackService.activatePlaylist(populated.id);
+  const futurePlaybackTimestamp = BASE_TIME + 100_000;
+  // Static and pause suspend the normal timeline. Persist the same shape the
+  // playback authority itself writes, so the pre-change reconciliation has no
+  // malformed timeline to repair and only the deletion moves the revision.
+  harness.database
+    .prepare(
+      `UPDATE playback_state
+       SET updated_at = ?, mode = 'off', static_asset_id = ?,
+           rotation_paused = 1, paused_remaining_ms = 7000,
+           slide_started_at = NULL, next_slide_at = NULL
+       WHERE output_id = 'global'`,
+    )
+    .run(futurePlaybackTimestamp, "asset-second");
+  const beforeDelete = harness.playback();
+
+  harness.service.removeEntry(populated.id, entries[0].id);
+  const afterDelete = harness.playback();
+  assert.equal(afterDelete.current_entry_id, entries[1].id);
+  assert.equal(afterDelete.slide_started_at, null);
+  assert.equal(afterDelete.next_slide_at, null);
+  assert.equal(afterDelete.paused_remaining_ms, 7000);
+  assert.equal(afterDelete.active_playlist_id, populated.id);
+  assert.equal(afterDelete.mode, "off");
+  assert.equal(afterDelete.static_asset_id, "asset-second");
+  assert.equal(afterDelete.rotation_paused, 1);
+  assert.equal(afterDelete.revision, beforeDelete.revision + 1);
+  assert.equal(afterDelete.updated_at, futurePlaybackTimestamp + 1);
+  assert.deepEqual(
+    harness.service.get(populated.id).entries.map((entry) => entry.position),
+    [0],
+  );
+
+  harness.database
+    .prepare(
+      `UPDATE playback_state
+       SET static_asset_id = NULL, rotation_paused = 0
+       WHERE output_id = 'global'`,
+    )
+    .run();
+  const result = harness.playbackService.activatePlaylist(empty.id);
+  assert.equal(result.activation, "active");
+  assert.equal(result.playback.activePlaylistId, empty.id);
+  assert.equal(result.playback.currentEntryId, null);
+  assert.equal(result.playback.slideStartedAt, null);
+  assert.equal(result.playback.nextSlideAt, null);
+});
+
+test("inactive playlist edits do not mutate authoritative playback state", (t) => {
+  const harness = createHarness();
+  t.after(() => harness.database.close());
+  const active = harness.service.create({ name: "Live" });
+  const inactive = harness.service.create({ name: "Draft" });
+  harness.service.addEntry(active.id, {
+    assetId: harness.seedAsset({ id: "live", name: "Live asset" }),
+  });
+  const draftEntry = harness.service.addEntry(inactive.id, {
+    assetId: harness.seedAsset({ id: "draft", name: "Draft asset" }),
+  });
+  harness.playbackService.activatePlaylist(active.id);
+  const before = harness.playback();
+
+  harness.service.update(inactive.id, { name: "Draft edited" });
+  harness.service.updateEntry(inactive.id, draftEntry.id, { enabled: false });
+  harness.service.reorderEntries(inactive.id, [draftEntry.id]);
+  assert.deepEqual(harness.playback(), before);
+});

server/test/runtime.test.js

@@ -0,0 +1,200 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const net = require("node:net");
+const { loadConfig } = require("../src/config");
+const { createRuntime } = require("../src/runtime");
+
+function testConfig(overrides = {}) {
+  return loadConfig({
+    NODE_ENV: "test",
+    HOST: "127.0.0.1",
+    PORT: "0",
+    DATABASE_PATH: ":memory:",
+    APP_TIMEZONE: "America/Chicago",
+    SHUTDOWN_TIMEOUT_MS: "1000",
+    S3_ENDPOINT: "http://seaweedfs:8333",
+    S3_REGION: "us-east-1",
+    S3_BUCKET: "announcements",
+    S3_ACCESS_KEY_ID: "access-key-that-must-not-leak",
+    S3_SECRET_ACCESS_KEY: "secret-key-that-must-not-leak",
+    S3_FORCE_PATH_STYLE: "true",
+    MQTT_URL: "mqtt://broker:1883",
+    MQTT_PASSWORD: "mqtt-password-that-must-not-leak",
+    HA_WEBHOOK_URL: "http://home-assistant:8123/api/webhook/private-id",
+    ...overrides,
+  });
+}
+
+const silentLogger = {
+  info() {},
+  warn() {},
+  error() {},
+};
+
+function testStorage() {
+  return {
+    async start() {},
+    stop() {},
+    health() {
+      return {
+        status: "degraded",
+        checkedAt: "2026-08-16T00:00:00.000Z",
+        lastSuccessAt: null,
+        code: "STORAGE_UNAVAILABLE",
+        message: "Object storage is unavailable",
+      };
+    },
+  };
+}
+
+async function responseJson(baseUrl, path, init) {
+  const response = await fetch(`${baseUrl}${path}`, init);
+  return { response, body: await response.json() };
+}
+
+test("HTTP foundation exposes live, ready, detailed health, and persisted settings", async (t) => {
+  const runtime = createRuntime({
+    config: testConfig(),
+    logger: silentLogger,
+    storage: testStorage(),
+  });
+  await runtime.start();
+  t.after(() => runtime.stop("test cleanup"));
+  const baseUrl = `http://127.0.0.1:${runtime.address.port}`;
+
+  const live = await responseJson(baseUrl, "/health/live");
+  assert.equal(live.response.status, 200);
+  assert.deepEqual(live.body, { status: "ok" });
+
+  const ready = await responseJson(baseUrl, "/health/ready");
+  assert.equal(ready.response.status, 200);
+  assert.equal(ready.body.status, "ready");
+
+  const status = await responseJson(baseUrl, "/api/health");
+  assert.equal(status.response.status, 200);
+  assert.equal(status.body.status, "degraded");
+  assert.equal(status.body.services.database.currentSchemaVersion, 1);
+  assert.equal(status.body.services.storage.status, "degraded");
+  const statusText = JSON.stringify(status.body);
+  assert.doesNotMatch(statusText, /access-key-that-must-not-leak/);
+  assert.doesNotMatch(statusText, /secret-key-that-must-not-leak/);
+  assert.doesNotMatch(statusText, /mqtt-password-that-must-not-leak/);
+  assert.doesNotMatch(statusText, /private-id/);
+
+  const statusAlias = await responseJson(baseUrl, "/api/status");
+  assert.equal(statusAlias.response.status, 200);
+  assert.deepEqual(statusAlias.body, status.body);
+
+  const initial = await responseJson(baseUrl, "/api/settings");
+  assert.equal(initial.body.defaultBackgroundDarkened, false);
+
+  const changed = await responseJson(baseUrl, "/api/settings", {
+    method: "PATCH",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({
+      defaultBackgroundDarkened: true,
+      defaultDurationMs: 9000,
+    }),
+  });
+  assert.equal(changed.response.status, 200);
+  assert.equal(changed.body.revision, 2);
+  assert.equal(changed.body.defaultBackgroundDarkened, true);
+
+  const reread = await responseJson(baseUrl, "/api/settings");
+  assert.equal(reread.body.defaultDurationMs, 9000);
+});
+
+test("invalid settings receive a structured client error", async (t) => {
+  const runtime = createRuntime({
+    config: testConfig(),
+    logger: silentLogger,
+    storage: testStorage(),
+  });
+  await runtime.start();
+  t.after(() => runtime.stop("test cleanup"));
+  const baseUrl = `http://127.0.0.1:${runtime.address.port}`;
+
+  const result = await responseJson(baseUrl, "/api/settings", {
+    method: "PATCH",
+    headers: { "content-type": "application/json" },
+    body: JSON.stringify({ defaultBackgroundDarkened: 0.25 }),
+  });
+
+  assert.equal(result.response.status, 400);
+  assert.equal(result.body.error.code, "INVALID_SETTINGS");
+});
+
+test("liveness stays up while critical readiness failures return 503", async (t) => {
+  const runtime = createRuntime({
+    config: testConfig(),
+    logger: silentLogger,
+    storage: testStorage(),
+  });
+  await runtime.start();
+  t.after(() => runtime.stop("test cleanup"));
+  const baseUrl = `http://127.0.0.1:${runtime.address.port}`;
+
+  runtime.lifecycle.ready = false;
+  let live = await responseJson(baseUrl, "/health/live");
+  let ready = await responseJson(baseUrl, "/health/ready");
+  assert.equal(live.response.status, 200);
+  assert.equal(ready.response.status, 503);
+  assert.equal(ready.body.status, "not_ready");
+
+  runtime.lifecycle.ready = true;
+  runtime.migrations.pendingVersions.push(2);
+  ready = await responseJson(baseUrl, "/health/ready");
+  assert.equal(ready.response.status, 503);
+  assert.equal(ready.body.checks.migrations, "pending");
+
+  runtime.migrations.pendingVersions.length = 0;
+  runtime.database.close();
+  live = await responseJson(baseUrl, "/health/live");
+  ready = await responseJson(baseUrl, "/health/ready");
+  assert.equal(live.response.status, 200);
+  assert.equal(ready.response.status, 503);
+  assert.equal(ready.body.checks.database, "error");
+});
+
+test("runtime startup and shutdown are idempotent", async () => {
+  const runtime = createRuntime({
+    config: testConfig(),
+    logger: silentLogger,
+    storage: testStorage(),
+  });
+  const [firstAddress, secondAddress] = await Promise.all([
+    runtime.start(),
+    runtime.start(),
+  ]);
+  assert.deepEqual(firstAddress, secondAddress);
+  assert.equal(runtime.lifecycle.ready, true);
+
+  await Promise.all([runtime.stop("test"), runtime.stop("test")]);
+  assert.equal(runtime.lifecycle.ready, false);
+  assert.equal(runtime.database.open, false);
+});
+
+test("a listen failure stops playback and closes startup resources", async (t) => {
+  const occupied = net.createServer();
+  occupied.listen(0, "127.0.0.1");
+  await new Promise((resolve, reject) => {
+    occupied.once("listening", resolve);
+    occupied.once("error", reject);
+  });
+  t.after(
+    () =>
+      new Promise((resolve) => {
+        occupied.close(resolve);
+      }),
+  );
+
+  const runtime = createRuntime({
+    config: testConfig({ PORT: String(occupied.address().port) }),
+    logger: silentLogger,
+    storage: testStorage(),
+  });
+
+  await assert.rejects(runtime.start(), (error) => error.code === "EADDRINUSE");
+  assert.equal(runtime.lifecycle.ready, false);
+  assert.equal(runtime.database.open, false);
+});

server/test/settings.test.js

@@ -0,0 +1,81 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const { openDatabase } = require("../src/database");
+const { runMigrations } = require("../src/database/migrate");
+const {
+  SettingsValidationError,
+  createSettingsService,
+} = require("../src/settings/service");
+
+function createService() {
+  const database = openDatabase({ path: ":memory:" });
+  runMigrations(database);
+  return {
+    database,
+    service: createSettingsService(database, { now: () => 2_000_000_000_000 }),
+  };
+}
+
+test("settings are persisted with the approved defaults", (t) => {
+  const { database, service } = createService();
+  t.after(() => database.close());
+
+  assert.deepEqual(service.get(), {
+    revision: 1,
+    defaultDurationMs: 7000,
+    defaultBackgroundMode: "blurred",
+    defaultSolidBackgroundColor: "#000000",
+    defaultBackgroundDarkened: false,
+    defaultBlurPx: 20,
+    crossfadeDurationMs: 1000,
+    updatedAt: database.prepare("SELECT updated_at FROM app_settings").get()
+      .updated_at,
+  });
+});
+
+test("settings updates persist boolean darkening and increment revision", (t) => {
+  const { database, service } = createService();
+  t.after(() => database.close());
+
+  const updated = service.update({
+    defaultBackgroundDarkened: true,
+    defaultBlurPx: 24,
+  });
+
+  assert.equal(updated.revision, 2);
+  assert.equal(updated.defaultBackgroundDarkened, true);
+  assert.equal(updated.defaultBlurPx, 24);
+  assert.equal(
+    database.prepare("SELECT default_background_darkened FROM app_settings").get()
+      .default_background_darkened,
+    1,
+  );
+});
+
+test("settings reject strength values, unknown fields, and invalid values", (t) => {
+  const { database, service } = createService();
+  t.after(() => database.close());
+
+  const original = service.get();
+
+  assert.throws(
+    () => service.update({ defaultBlurPx: 24, darkeningOverride: 0.25 }),
+    (error) => error instanceof SettingsValidationError,
+  );
+  assert.deepEqual(service.get(), original);
+  assert.throws(
+    () => service.update({ defaultBlurPx: 24, defaultBackgroundDarkened: 1 }),
+    /must be a boolean/,
+  );
+  assert.deepEqual(service.get(), original);
+  assert.throws(
+    () => service.update({ defaultDurationMs: 0 }),
+    /positive integer/,
+  );
+  assert.deepEqual(service.get(), original);
+  assert.throws(
+    () => service.update({ toString: "not a setting" }),
+    /unknown fields/,
+  );
+  assert.deepEqual(service.get(), original);
+});

server/test/socket-invalidation.test.js

@@ -0,0 +1,383 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const { loadConfig } = require("../src/config");
+const { createRuntime } = require("../src/runtime");
+
+const silentLogger = {
+  info() {},
+  warn() {},
+  error() {},
+};
+
+function testConfig() {
+  return loadConfig({
+    NODE_ENV: "test",
+    HOST: "127.0.0.1",
+    PORT: "0",
+    DATABASE_PATH: ":memory:",
+    APP_TIMEZONE: "America/Chicago",
+    SHUTDOWN_TIMEOUT_MS: "1000",
+    S3_ENDPOINT: "http://seaweedfs:8333",
+    S3_BUCKET: "announcements-test",
+  });
+}
+
+function testStorage() {
+  return {
+    async start() {},
+    stop() {},
+    health() {
+      return {
+        status: "healthy",
+        checkedAt: "2032-04-05T12:00:00.000Z",
+        lastSuccessAt: "2032-04-05T12:00:00.000Z",
+      };
+    },
+  };
+}
+
+async function jsonRequest(baseUrl, route, { body, ...init } = {}) {
+  const response = await fetch(`${baseUrl}${route}`, {
+    ...init,
+    ...(body === undefined
+      ? {}
+      : {
+          headers: { "content-type": "application/json", ...init.headers },
+          body: JSON.stringify(body),
+        }),
+  });
+  return { response, body: await response.json() };
+}
+
+function splitEnginePackets(payload) {
+  return payload.split("\x1e").filter(Boolean);
+}
+
+function socketEvents(payload) {
+  return splitEnginePackets(payload)
+    .filter((packet) => packet.startsWith("42"))
+    .map((packet) => JSON.parse(packet.slice(2)));
+}
+
+async function connectPollingSocket(baseUrl) {
+  let requestNumber = 0;
+  const endpoint = (sid) => {
+    const parameters = new URLSearchParams({
+      EIO: "4",
+      transport: "polling",
+      t: String(requestNumber++),
+    });
+    if (sid) parameters.set("sid", sid);
+    return `${baseUrl}/socket.io/?${parameters}`;
+  };
+
+  const openingResponse = await fetch(endpoint());
+  assert.equal(openingResponse.status, 200);
+  const openingPackets = splitEnginePackets(await openingResponse.text());
+  const openPacket = openingPackets.find((packet) => packet.startsWith("0"));
+  assert.ok(openPacket, "Engine.IO must return an open packet");
+  const { sid } = JSON.parse(openPacket.slice(1));
+
+  const connectResponse = await fetch(endpoint(sid), {
+    method: "POST",
+    headers: { "content-type": "text/plain;charset=UTF-8" },
+    body: "40",
+  });
+  assert.equal(connectResponse.status, 200);
+  await connectResponse.text();
+
+  const connectedResponse = await fetch(endpoint(sid));
+  assert.equal(connectedResponse.status, 200);
+  const connectedPayload = await connectedResponse.text();
+  assert.ok(
+    splitEnginePackets(connectedPayload).some((packet) =>
+      packet.startsWith("40"),
+    ),
+    "Socket.IO must acknowledge the namespace connection",
+  );
+
+  return {
+    initialEvents: socketEvents(connectedPayload),
+    async poll() {
+      const response = await fetch(endpoint(sid), {
+        signal: AbortSignal.timeout(3_000),
+      });
+      assert.equal(response.status, 200);
+      return response.text();
+    },
+    async close() {
+      const response = await fetch(endpoint(sid), {
+        method: "POST",
+        headers: { "content-type": "text/plain;charset=UTF-8" },
+        body: "41",
+      });
+      await response.text();
+    },
+  };
+}
+
+test("Socket.IO sends an authoritative playback snapshot on connect and after mutations", async (t) => {
+  const runtime = createRuntime({
+    config: testConfig(),
+    logger: silentLogger,
+    storage: testStorage(),
+  });
+  await runtime.start();
+  t.after(() => runtime.stop("test cleanup"));
+  const baseUrl = `http://127.0.0.1:${runtime.address.port}`;
+  const socket = await connectPollingSocket(baseUrl);
+  t.after(() => socket.close().catch(() => {}));
+
+  let initial = socket.initialEvents.find(
+    ([eventName]) => eventName === "playback:state",
+  );
+  if (!initial) {
+    initial = socketEvents(await socket.poll()).find(
+      ([eventName]) => eventName === "playback:state",
+    );
+  }
+  assert.ok(initial, "a full playback snapshot must be sent on connection");
+  assert.equal(initial[1].protocolVersion, 1);
+  assert.equal(initial[1].outputId, "global");
+  const initialRevision = initial[1].playbackRevision;
+
+  const read = await jsonRequest(baseUrl, "/api/playback");
+  assert.equal(read.response.status, 200);
+  assert.equal(read.body.playbackRevision, initialRevision);
+  const reread = await jsonRequest(baseUrl, "/api/playback");
+  assert.equal(reread.body.playbackRevision, initialRevision);
+
+  const changed = await jsonRequest(baseUrl, "/api/playback/mode", {
+    method: "PUT",
+    body: { mode: "off" },
+  });
+  assert.equal(changed.response.status, 200);
+  assert.equal(changed.body.mode, "off");
+  assert.equal(changed.body.playbackRevision, initialRevision + 1);
+
+  const events = socketEvents(await socket.poll());
+  const playbackEvents = events.filter(
+    ([eventName]) => eventName === "playback:state",
+  );
+  assert.equal(playbackEvents.length, 1);
+  assert.deepEqual(playbackEvents[0][1], changed.body);
+
+  const unchanged = await jsonRequest(baseUrl, "/api/playback/mode", {
+    method: "PUT",
+    body: { mode: "off" },
+  });
+  assert.equal(unchanged.body.playbackRevision, changed.body.playbackRevision);
+  assert.equal(
+    runtime.database
+      .prepare("SELECT revision FROM playback_state WHERE output_id = 'global'")
+      .get().revision,
+    changed.body.playbackRevision,
+  );
+});
+
+test("Socket.IO publishes playlists:changed only after successful semantic mutations", async (t) => {
+  const runtime = createRuntime({
+    config: testConfig(),
+    logger: silentLogger,
+    storage: testStorage(),
+  });
+  await runtime.start();
+  t.after(() => runtime.stop("test cleanup"));
+  const baseUrl = `http://127.0.0.1:${runtime.address.port}`;
+  const socket = await connectPollingSocket(baseUrl);
+  t.after(() => socket.close().catch(() => {}));
+
+  await jsonRequest(baseUrl, "/api/playlists");
+  const invalid = await jsonRequest(baseUrl, "/api/playlists", {
+    method: "POST",
+    body: {},
+  });
+  assert.equal(invalid.response.status, 400);
+  await jsonRequest(baseUrl, "/api/settings", {
+    method: "PATCH",
+    body: { defaultDurationMs: 7_000 },
+  });
+
+  const created = await jsonRequest(baseUrl, "/api/playlists", {
+    method: "POST",
+    body: { name: "Sunday" },
+  });
+  assert.equal(created.response.status, 201);
+  let events = socketEvents(await socket.poll());
+  let playlistEvents = events.filter(
+    ([eventName]) => eventName === "playlists:changed",
+  );
+  assert.equal(playlistEvents.length, 1);
+  assert.equal(playlistEvents[0][1].reason, "created");
+  assert.equal(playlistEvents[0][1].playlistId, created.body.id);
+
+  const duplicate = await jsonRequest(baseUrl, "/api/playlists", {
+    method: "POST",
+    body: { name: "SUNDAY" },
+  });
+  assert.equal(duplicate.response.status, 409);
+  await jsonRequest(baseUrl, `/api/playlists/${created.body.id}`, {
+    method: "PATCH",
+    body: { name: "Sunday" },
+  });
+  await jsonRequest(baseUrl, "/api/settings", {
+    method: "PATCH",
+    body: { defaultDurationMs: 8_000 },
+  });
+  events = socketEvents(await socket.poll());
+  playlistEvents = events.filter(
+    ([eventName]) => eventName === "playlists:changed",
+  );
+  assert.deepEqual(playlistEvents, [
+    [
+      "playlists:changed",
+      {
+        reason: "settings_updated",
+        playlistIds: null,
+        settingsRevision: 2,
+      },
+    ],
+  ]);
+
+  const second = await jsonRequest(baseUrl, "/api/playlists", {
+    method: "POST",
+    body: { name: "Midweek" },
+  });
+  assert.equal(second.response.status, 201);
+  events = socketEvents(await socket.poll());
+  playlistEvents = events.filter(
+    ([eventName]) => eventName === "playlists:changed",
+  );
+  assert.equal(playlistEvents.length, 1);
+  assert.equal(playlistEvents[0][1].reason, "created");
+
+  const activated = await jsonRequest(
+    baseUrl,
+    `/api/playlists/${created.body.id}/activate`,
+    { method: "POST" },
+  );
+  assert.equal(activated.response.status, 200);
+  assert.equal(activated.body.activation, "active");
+  events = socketEvents(await socket.poll());
+  playlistEvents = events.filter(
+    ([eventName]) => eventName === "playlists:changed",
+  );
+  assert.equal(playlistEvents.length, 1);
+  assert.equal(playlistEvents[0][1].reason, "activated");
+  assert.equal(playlistEvents[0][1].playlistId, created.body.id);
+  assert.equal(
+    playlistEvents[0][1].playbackRevision,
+    activated.body.playback.revision,
+  );
+  assert.equal(
+    events.filter(([eventName]) => eventName === "playback:state").length,
+    1,
+  );
+
+  const activeDelete = await jsonRequest(
+    baseUrl,
+    `/api/playlists/${created.body.id}`,
+    { method: "DELETE" },
+  );
+  assert.equal(activeDelete.response.status, 409);
+  assert.equal(activeDelete.body.error.code, "PLAYLIST_ACTIVE");
+});
+
+test("activation invalidations come from authoritative pending-state transitions", async (t) => {
+  const runtime = createRuntime({
+    config: testConfig(),
+    logger: silentLogger,
+    storage: testStorage(),
+  });
+  await runtime.start();
+  t.after(() => runtime.stop("test cleanup"));
+  const timestamp = Date.now();
+  const insertAsset = runtime.database.prepare(`
+    INSERT INTO assets (
+      id, source_sha256, display_name, original_filename, status,
+      display_sha256, display_content_type, display_byte_size,
+      display_width, display_height, created_at, updated_at
+    ) VALUES (?, ?, ?, ?, 'ready', ?, 'image/webp', 1, 1920, 1080, ?, ?)
+  `);
+  const insertPlaylist = runtime.database.prepare(`
+    INSERT INTO playlists (id, name, created_at, updated_at)
+    VALUES (?, ?, ?, ?)
+  `);
+  const insertEntry = runtime.database.prepare(`
+    INSERT INTO playlist_entries (
+      id, playlist_id, asset_id, position, created_at, updated_at
+    ) VALUES (?, ?, ?, 0, ?, ?)
+  `);
+  insertAsset.run(
+    "asset-old",
+    "a".repeat(64),
+    "Old asset",
+    "old.png",
+    "c".repeat(64),
+    timestamp,
+    timestamp,
+  );
+  insertAsset.run(
+    "asset-new",
+    "b".repeat(64),
+    "New asset",
+    "new.png",
+    "d".repeat(64),
+    timestamp,
+    timestamp,
+  );
+  insertPlaylist.run("playlist-old", "Old", timestamp, timestamp);
+  insertPlaylist.run("playlist-new", "New", timestamp, timestamp);
+  insertEntry.run(
+    "entry-old",
+    "playlist-old",
+    "asset-old",
+    timestamp,
+    timestamp,
+  );
+  insertEntry.run(
+    "entry-new",
+    "playlist-new",
+    "asset-new",
+    timestamp,
+    timestamp,
+  );
+
+  const baseUrl = `http://127.0.0.1:${runtime.address.port}`;
+  const socket = await connectPollingSocket(baseUrl);
+  t.after(() => socket.close().catch(() => {}));
+
+  const activateOld = await jsonRequest(
+    baseUrl,
+    "/api/playlists/playlist-old/activate",
+    { method: "POST" },
+  );
+  assert.equal(activateOld.body.activation, "active");
+  await socket.poll();
+
+  const requestNew = await jsonRequest(
+    baseUrl,
+    "/api/playlists/playlist-new/activate",
+    { method: "POST" },
+  );
+  assert.equal(requestNew.body.activation, "pending");
+  let invalidations = socketEvents(await socket.poll()).filter(
+    ([eventName]) => eventName === "playlists:changed",
+  );
+  assert.equal(invalidations.length, 1);
+  assert.equal(invalidations[0][1].reason, "activation_requested");
+  assert.equal(invalidations[0][1].pendingPlaylistId, "playlist-new");
+
+  const cancel = await jsonRequest(
+    baseUrl,
+    "/api/playlists/playlist-old/activate",
+    { method: "POST" },
+  );
+  assert.equal(cancel.body.activation, "already_active");
+  invalidations = socketEvents(await socket.poll()).filter(
+    ([eventName]) => eventName === "playlists:changed",
+  );
+  assert.equal(invalidations.length, 1);
+  assert.equal(invalidations[0][1].reason, "activation_canceled");
+  assert.equal(invalidations[0][1].pendingPlaylistId, null);
+});

server/test/storage-health.test.js

@@ -0,0 +1,105 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const express = require("express");
+const { openDatabase } = require("../src/database");
+const { runMigrations } = require("../src/database/migrate");
+const {
+  createDetailedHealthRouter,
+  createHealthRouter,
+} = require("../src/health/routes");
+
+function config() {
+  return {
+    environment: "test",
+    host: "127.0.0.1",
+    port: 0,
+    timeZone: "America/Chicago",
+    trustProxy: true,
+    database: { path: ":memory:" },
+    storage: {
+      endpoint: "http://private-storage:8333",
+      region: "us-east-1",
+      bucket: "announcements-v2",
+      accessKeyId: "must-not-leak",
+      secretAccessKey: "must-not-leak-either",
+      forcePathStyle: true,
+    },
+    processing: {
+      tempDirectory: "/tmp/announcements-uploads",
+      maxFileBytes: 1024,
+      maxFiles: 2,
+      maxInputPixels: 1000,
+    },
+    mqtt: { url: null },
+    notifications: { homeAssistantWebhookUrl: null },
+  };
+}
+
+async function withServer(storage, callback) {
+  const database = openDatabase({ path: ":memory:", busyTimeoutMs: 1000 });
+  const migrations = runMigrations(database);
+  const lifecycle = { ready: true };
+  const app = express();
+  const options = { config: config(), database, lifecycle, migrations, storage };
+  app.use("/health", createHealthRouter(options));
+  app.use("/api/health", createDetailedHealthRouter(options));
+  const server = app.listen(0, "127.0.0.1");
+  await new Promise((resolve) => server.once("listening", resolve));
+
+  try {
+    await callback(`http://127.0.0.1:${server.address().port}`);
+  } finally {
+    await new Promise((resolve) => server.close(resolve));
+    database.close();
+  }
+}
+
+test("storage degradation is reported but does not fail API readiness", async () => {
+  const storage = {
+    health() {
+      return {
+        status: "degraded",
+        checkedAt: "2026-08-16T12:00:00.000Z",
+        lastSuccessAt: "2026-08-16T11:59:00.000Z",
+        code: "STORAGE_UNAVAILABLE",
+      };
+    },
+  };
+
+  await withServer(storage, async (baseUrl) => {
+    const ready = await fetch(`${baseUrl}/health/ready`);
+    const readyBody = await ready.json();
+    assert.equal(ready.status, 200);
+    assert.equal(readyBody.status, "ready");
+    assert.equal(readyBody.checks.storage, "degraded");
+
+    const detailed = await fetch(`${baseUrl}/api/health`);
+    const detailedBody = await detailed.json();
+    assert.equal(detailed.status, 200);
+    assert.equal(detailedBody.status, "degraded");
+    assert.equal(detailedBody.services.storage.status, "degraded");
+    assert.equal(
+      detailedBody.services.storage.lastSuccessAt,
+      "2026-08-16T11:59:00.000Z",
+    );
+    assert.equal(detailedBody.services.storage.code, "STORAGE_UNAVAILABLE");
+    assert.doesNotMatch(JSON.stringify(detailedBody), /must-not-leak/);
+    assert.doesNotMatch(JSON.stringify(detailedBody), /private-storage/);
+  });
+});
+
+test("healthy storage produces healthy detailed status", async () => {
+  const storage = {
+    health() {
+      return { status: "healthy", checkedAt: "2026-08-16T12:00:00.000Z" };
+    },
+  };
+
+  await withServer(storage, async (baseUrl) => {
+    const detailed = await fetch(`${baseUrl}/api/health`);
+    const body = await detailed.json();
+    assert.equal(detailed.status, 200);
+    assert.equal(body.status, "ok");
+    assert.equal(body.services.storage.status, "healthy");
+  });
+});

server/test/storage.test.js

@@ -0,0 +1,397 @@
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const http = require("node:http");
+const { PassThrough, Readable } = require("node:stream");
+const {
+  StorageObjectNotFoundError,
+  StorageUnavailableError,
+  createStorageService,
+} = require("../src/storage");
+
+const storageConfig = {
+  endpoint: "http://seaweedfs:8333",
+  region: "us-east-1",
+  bucket: "announcements-v2",
+  accessKeyId: "test-key",
+  secretAccessKey: "test-secret",
+  forcePathStyle: true,
+};
+
+function fakeClient(handler) {
+  const commands = [];
+  return {
+    commands,
+    async send(command) {
+      commands.push(command);
+      return handler(command, commands.length - 1);
+    },
+  };
+}
+
+function commandName(command) {
+  return command.constructor.name;
+}
+
+test("storage initialization probes an existing bucket without creating it", async () => {
+  const client = fakeClient(async () => ({}));
+  const service = createStorageService(storageConfig, { client });
+
+  const health = await service.initialize();
+  assert.equal(health.status, "healthy");
+  assert.match(health.checkedAt, /T/);
+  assert.equal(health.lastSuccessAt, health.checkedAt);
+  assert.deepEqual(client.commands.map(commandName), ["HeadBucketCommand"]);
+});
+
+test("storage initialization creates only a missing bucket", async () => {
+  let exists = false;
+  const missing = Object.assign(new Error("missing"), {
+    name: "NoSuchBucket",
+    $metadata: { httpStatusCode: 404 },
+  });
+  const client = fakeClient(async (command) => {
+    if (commandName(command) === "HeadBucketCommand" && !exists) throw missing;
+    if (commandName(command) === "CreateBucketCommand") exists = true;
+    return {};
+  });
+  const service = createStorageService(storageConfig, { client });
+
+  assert.deepEqual(await service.ensureBucket(), { created: true });
+  assert.deepEqual(client.commands.map(commandName), [
+    "HeadBucketCommand",
+    "CreateBucketCommand",
+  ]);
+  assert.equal(client.commands[1].input.Bucket, storageConfig.bucket);
+
+  assert.deepEqual(await service.ensureBucket(), { created: false });
+  assert.deepEqual(client.commands.map(commandName), [
+    "HeadBucketCommand",
+    "CreateBucketCommand",
+    "HeadBucketCommand",
+  ]);
+});
+
+test("storage start performs a nonfatal immediate check and stop releases its client", async () => {
+  let destroyed = false;
+  const client = fakeClient(async () => ({}));
+  client.destroy = () => {
+    destroyed = true;
+  };
+  const service = createStorageService(
+    { ...storageConfig, healthProbeIntervalMs: 1_000 },
+    { client },
+  );
+
+  const health = await service.start();
+  assert.equal(health.status, "healthy");
+  assert.deepEqual(client.commands.map(commandName), ["HeadBucketCommand"]);
+  service.stop();
+  assert.equal(destroyed, true);
+});
+
+test("a create-bucket race is healthy only after the bucket can be verified", async () => {
+  const missing = Object.assign(new Error("missing"), {
+    name: "NoSuchBucket",
+    $metadata: { httpStatusCode: 404 },
+  });
+  const conflict = Object.assign(new Error("race"), {
+    name: "BucketAlreadyOwnedByYou",
+    $metadata: { httpStatusCode: 409 },
+  });
+  let headCalls = 0;
+  const client = fakeClient(async (command) => {
+    if (commandName(command) === "HeadBucketCommand") {
+      headCalls += 1;
+      if (headCalls === 1) throw missing;
+      return {};
+    }
+    if (commandName(command) === "CreateBucketCommand") throw conflict;
+    throw new Error(`Unexpected ${commandName(command)}`);
+  });
+  const service = createStorageService(storageConfig, { client });
+
+  assert.deepEqual(await service.ensureBucket(), { created: false });
+  assert.equal(service.health().status, "healthy");
+  assert.deepEqual(client.commands.map(commandName), [
+    "HeadBucketCommand",
+    "CreateBucketCommand",
+    "HeadBucketCommand",
+  ]);
+});
+
+test("an older failed probe cannot overwrite a newer successful operation", async () => {
+  let rejectProbe;
+  let notifyProbeStarted;
+  const probeStarted = new Promise((resolve) => {
+    notifyProbeStarted = resolve;
+  });
+  let headCalls = 0;
+  const client = fakeClient(async (command) => {
+    if (commandName(command) === "HeadBucketCommand") {
+      headCalls += 1;
+      if (headCalls === 1) return {};
+      notifyProbeStarted();
+      return new Promise((resolve, reject) => {
+        rejectProbe = reject;
+      });
+    }
+    if (commandName(command) === "PutObjectCommand") return {};
+    throw new Error(`Unexpected ${commandName(command)}`);
+  });
+  const service = createStorageService(storageConfig, { client });
+  await service.initialize();
+
+  const staleProbe = service.probe();
+  await probeStarted;
+  await service.putObject({
+    key: "assets/id/original/hash",
+    body: Buffer.from("bytes"),
+    contentLength: 5,
+  });
+  const successfulState = service.health();
+  rejectProbe(new Error("older request failed"));
+  await staleProbe;
+
+  assert.equal(successfulState.status, "healthy");
+  assert.deepEqual(service.health(), successfulState);
+});
+
+test("temporary storage failure degrades without throwing during initialization and recovers", async () => {
+  let available = false;
+  const warnings = [];
+  const client = fakeClient(async () => {
+    if (!available) throw new Error("connection refused at a private address");
+    return {};
+  });
+  const service = createStorageService(storageConfig, {
+    client,
+    logger: { warn(message) { warnings.push(message); } },
+  });
+
+  const initial = await service.initialize();
+  assert.equal(initial.status, "degraded");
+  assert.equal(initial.code, "STORAGE_UNAVAILABLE");
+  assert.equal(initial.lastSuccessAt, null);
+  assert.deepEqual(warnings, ["Object storage is unavailable during initialization"]);
+
+  available = true;
+  const recovered = await service.probe();
+  assert.equal(recovered.status, "healthy");
+  assert.equal(recovered.lastSuccessAt, recovered.checkedAt);
+  assert.equal(service.health().status, "healthy");
+
+  available = false;
+  const degradedAgain = await service.probe();
+  assert.equal(degradedAgain.status, "degraded");
+  assert.equal(degradedAgain.lastSuccessAt, recovered.lastSuccessAt);
+});
+
+test("put, get, head, existence, and delete use the configured private bucket", async () => {
+  const body = Readable.from([Buffer.from("image bytes")]);
+  const client = fakeClient(async (command) => {
+    switch (commandName(command)) {
+      case "PutObjectCommand":
+        return { ETag: '"etag"' };
+      case "GetObjectCommand":
+        return {
+          Body: body,
+          ContentType: "image/webp",
+          ContentLength: 11,
+          ETag: '"etag"',
+        };
+      case "HeadObjectCommand":
+        return {
+          ContentType: "image/webp",
+          ContentLength: 11,
+          ETag: '"etag"',
+        };
+      case "DeleteObjectCommand":
+        return {};
+      case "HeadBucketCommand":
+        return {};
+      default:
+        throw new Error(`Unexpected ${commandName(command)}`);
+    }
+  });
+  const service = createStorageService(storageConfig, { client });
+  const key = "assets/id/display/hash.webp";
+  await service.initialize();
+  client.commands.length = 0;
+
+  const put = await service.putObject({
+    key,
+    body: Buffer.from("image bytes"),
+    contentType: "image/webp",
+    contentLength: 11,
+  });
+  assert.deepEqual(put, { key, etag: '"etag"', versionId: null });
+
+  const fetched = await service.getObject(key);
+  assert.equal(fetched.body, body);
+  assert.equal(fetched.contentType, "image/webp");
+  assert.equal(fetched.contentLength, 11);
+
+  assert.equal((await service.headObject(key)).etag, '"etag"');
+  assert.equal(await service.objectExists(key), true);
+  await service.deleteObject(key);
+
+  for (const command of client.commands) {
+    assert.equal(command.input.Bucket, storageConfig.bucket);
+    assert.equal(command.input.Key, key);
+  }
+});
+
+test("missing objects are distinct from unavailable storage", async () => {
+  let missing = true;
+  const client = fakeClient(async (command) => {
+    if (commandName(command) === "HeadBucketCommand") return {};
+    if (missing) {
+      throw Object.assign(new Error("missing"), {
+        name: "NoSuchKey",
+        $metadata: { httpStatusCode: 404 },
+      });
+    }
+    throw new Error("network offline");
+  });
+  const service = createStorageService(storageConfig, { client });
+
+  await service.initialize();
+  client.commands.length = 0;
+
+  assert.equal(await service.headObject("assets/id/original/hash"), null);
+  assert.equal(await service.objectExists("assets/id/original/hash"), false);
+  await assert.rejects(
+    service.getObject("assets/id/original/hash"),
+    StorageObjectNotFoundError,
+  );
+  assert.equal(service.health().status, "healthy");
+
+  missing = false;
+  await assert.rejects(
+    service.putObject({ key: "assets/id/original/hash", body: Buffer.alloc(0) }),
+    (error) =>
+      error instanceof StorageUnavailableError &&
+      error.code === "STORAGE_UNAVAILABLE" &&
+      error.statusCode === 503,
+  );
+  assert.equal(service.health().status, "degraded");
+});
+
+test("a missing bucket during object access is a storage outage, not a missing object", async () => {
+  let initialized = false;
+  const client = fakeClient(async (command) => {
+    if (commandName(command) === "HeadBucketCommand" && !initialized) {
+      initialized = true;
+      return {};
+    }
+    throw Object.assign(new Error("bucket missing"), {
+      name: "NoSuchBucket",
+      $metadata: { httpStatusCode: 404 },
+    });
+  });
+  const service = createStorageService(storageConfig, { client });
+  await service.initialize();
+
+  await assert.rejects(
+    service.getObject("assets/id/original/hash"),
+    StorageUnavailableError,
+  );
+  assert.equal(service.health().status, "degraded");
+});
+
+test("storage rejects unsafe internal object keys before contacting S3", async () => {
+  const client = fakeClient(async () => ({}));
+  const service = createStorageService(storageConfig, { client });
+
+  await assert.rejects(
+    service.getObject("../private"),
+    /Storage object key is invalid/,
+  );
+  await assert.rejects(
+    service.deleteObject("/absolute"),
+    /Storage object key is invalid/,
+  );
+  assert.equal(client.commands.length, 0);
+});
+
+test("real HTTP requests time out instead of hanging indefinitely", async (t) => {
+  const server = http.createServer(() => {
+    // Intentionally accept the connection without sending response headers.
+  });
+  server.listen(0, "127.0.0.1");
+  await new Promise((resolve) => server.once("listening", resolve));
+  t.after(async () => {
+    server.closeAllConnections();
+    await new Promise((resolve) => server.close(resolve));
+  });
+
+  const service = createStorageService({
+    ...storageConfig,
+    endpoint: `http://127.0.0.1:${server.address().port}`,
+    connectionTimeoutMs: 100,
+    requestTimeoutMs: 100,
+    maxAttempts: 1,
+  });
+  t.after(() => service.stop());
+
+  const startedAt = Date.now();
+  const health = await service.probe();
+  assert.equal(health.status, "degraded");
+  assert.equal(health.code, "STORAGE_UNAVAILABLE");
+  assert.ok(Date.now() - startedAt < 2_000);
+});
+
+test("consumer stream cancellation does not falsely degrade storage", async () => {
+  let body = new PassThrough();
+  const client = fakeClient(async (command) => {
+    if (commandName(command) === "HeadBucketCommand") return {};
+    if (commandName(command) === "GetObjectCommand") {
+      return { Body: body, ContentLength: 10, ContentType: "image/webp" };
+    }
+    throw new Error(`Unexpected ${commandName(command)}`);
+  });
+  const service = createStorageService(storageConfig, { client });
+  await service.initialize();
+
+  const cancelled = await service.getObject("assets/id/display/hash.webp");
+  cancelled.body.destroy(
+    Object.assign(new Error("consumer closed"), {
+      code: "ERR_STREAM_PREMATURE_CLOSE",
+    }),
+  );
+  await new Promise((resolve) => setImmediate(resolve));
+  assert.equal(service.health().status, "healthy");
+
+  body = new PassThrough();
+  const failed = await service.getObject("assets/id/display/hash.webp");
+  failed.body.destroy(Object.assign(new Error("upstream reset"), { code: "ECONNRESET" }));
+  await new Promise((resolve) => setImmediate(resolve));
+  assert.equal(service.health().status, "degraded");
+});
+
+test("delete treats an already-missing object as an idempotent success", async () => {
+  let missingBucket = false;
+  const client = fakeClient(async (command) => {
+    if (commandName(command) === "HeadBucketCommand") return {};
+    if (commandName(command) === "DeleteObjectCommand") {
+      throw Object.assign(new Error("missing"), {
+        name: missingBucket ? "NoSuchBucket" : "NoSuchKey",
+        $metadata: { httpStatusCode: 404 },
+      });
+    }
+    throw new Error(`Unexpected ${commandName(command)}`);
+  });
+  const service = createStorageService(storageConfig, { client });
+  await service.initialize();
+
+  await assert.doesNotReject(
+    service.deleteObject("assets/id/original/hash"),
+  );
+  assert.equal(service.health().status, "healthy");
+
+  missingBucket = true;
+  await assert.rejects(
+    service.deleteObject("assets/id/original/hash"),
+    StorageUnavailableError,
+  );
+});