feat: add module schema discovery and validation

packages/contracts/package.json

@@ -19,6 +19,7 @@
     "typecheck": "tsc --noEmit --project tsconfig.json"
   },
   "dependencies": {
+    "drizzle-orm": "0.45.2",
     "semver": "7.8.5",
     "zod": "4.4.3"
   },

packages/contracts/src/index.ts

@@ -2,4 +2,5 @@ export * from "./identifiers.js";
 export * from "./module-lifecycle.js";
 export * from "./module-manifest.js";
 export * from "./module-runtime.js";
+export * from "./module-schema.js";
 export * from "./versions.js";

packages/contracts/src/module-schema.ts

@@ -0,0 +1,94 @@
+import { is } from "drizzle-orm";
+import { type AnyPgTable, PgTable } from "drizzle-orm/pg-core";
+import { z } from "zod";
+import { type ModuleId, moduleIdSchema } from "./identifiers.js";
+
+export const POSTGRES_IDENTIFIER_MAX_LENGTH = 63;
+
+export const moduleTableLocalNameSchema = z
+  .string()
+  .min(1)
+  .regex(/^[a-z][a-z0-9]*(?:_[a-z0-9]+)*$/u, "Must be a lowercase snake-case table name.");
+
+export const physicalModuleTableNameSchema = moduleTableLocalNameSchema.max(
+  POSTGRES_IDENTIFIER_MAX_LENGTH,
+  `Must not exceed ${POSTGRES_IDENTIFIER_MAX_LENGTH} characters.`,
+);
+
+export interface ModuleSchemaDefinition<
+  Tables extends Readonly<Record<string, AnyPgTable>> = Readonly<Record<string, AnyPgTable>>,
+> {
+  readonly moduleId: ModuleId;
+  readonly tables: Tables;
+}
+
+const schemaDefinitionKeys = new Set(["moduleId", "tables"]);
+const drizzleTableIsAlias = Symbol.for("drizzle:IsAlias");
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null && !Array.isArray(value);
+}
+
+function hasOnlyStringKeys(value: object, allowedKeys?: ReadonlySet<string>): boolean {
+  return Reflect.ownKeys(value).every(
+    (key) => typeof key === "string" && (!allowedKeys || allowedKeys.has(key)),
+  );
+}
+
+export function moduleTableNamespace(moduleId: ModuleId): string {
+  return moduleIdSchema.parse(moduleId).replaceAll("-", "_");
+}
+
+export function moduleTablePrefix(moduleId: ModuleId): string {
+  return `${moduleTableNamespace(moduleId)}_`;
+}
+
+export function moduleTableName(moduleId: ModuleId, localName: string): string {
+  const parsedLocalName = moduleTableLocalNameSchema.parse(localName);
+  const tableName = `${moduleTablePrefix(moduleId)}${parsedLocalName}`;
+  if (!physicalModuleTableNameSchema.safeParse(tableName).success) {
+    throw new RangeError("The namespaced PostgreSQL table name is invalid or too long.");
+  }
+  return tableName;
+}
+
+export function isModuleSchemaDefinition(value: unknown): value is ModuleSchemaDefinition {
+  try {
+    if (
+      !isRecord(value) ||
+      !hasOnlyStringKeys(value, schemaDefinitionKeys) ||
+      !moduleIdSchema.safeParse(value.moduleId).success ||
+      !isRecord(value.tables) ||
+      !hasOnlyStringKeys(value.tables)
+    ) {
+      return false;
+    }
+
+    const tables = Object.values(value.tables);
+    return (
+      tables.length > 0 &&
+      tables.every(
+        (table) =>
+          is(table, PgTable) &&
+          (table as unknown as Record<PropertyKey, unknown>)[drizzleTableIsAlias] === false,
+      )
+    );
+  } catch {
+    return false;
+  }
+}
+
+export function parseModuleSchemaDefinition(value: unknown): ModuleSchemaDefinition {
+  if (!isModuleSchemaDefinition(value)) {
+    throw new TypeError("Invalid Ekklesia module schema definition.");
+  }
+
+  const tables = Object.freeze(
+    Object.fromEntries(
+      Object.entries(value.tables).sort(([left], [right]) =>
+        left < right ? -1 : left > right ? 1 : 0,
+      ),
+    ) as Record<string, AnyPgTable>,
+  );
+  return Object.freeze({ moduleId: value.moduleId, tables });
+}

packages/contracts/tests/module-schema.test.ts

@@ -0,0 +1,54 @@
+import { alias, getTableConfig, integer } from "drizzle-orm/pg-core";
+import { describe, expect, it } from "vitest";
+import {
+  moduleTableName,
+  parseModuleSchemaDefinition,
+  physicalModuleTableNameSchema,
+} from "../src/index.js";
+import { pgTable } from "drizzle-orm/pg-core";
+
+describe("module schema contract", () => {
+  it("creates deterministic physical names from module and local identifiers", () => {
+    expect(moduleTableName("calendar", "events")).toBe("calendar_events");
+    expect(moduleTableName("care-team", "member_notes")).toBe("care_team_member_notes");
+  });
+
+  it("rejects unsafe logical names and PostgreSQL identifiers beyond 63 characters", () => {
+    expect(() => moduleTableName("calendar", "EventItems")).toThrow();
+    expect(() => moduleTableName("calendar", "event-items")).toThrow();
+    expect(physicalModuleTableNameSchema.safeParse("a".repeat(63)).success).toBe(true);
+    expect(physicalModuleTableNameSchema.safeParse("a".repeat(64)).success).toBe(false);
+    expect(() => moduleTableName("a".repeat(60), "rows")).toThrow(
+      "The namespaced PostgreSQL table name is invalid or too long.",
+    );
+  });
+
+  it("normalizes and freezes a typed schema definition without freezing its tables", () => {
+    const records = pgTable("example_records", { id: integer().primaryKey() });
+    const definition = parseModuleSchemaDefinition({
+      moduleId: "example",
+      tables: { records },
+    });
+
+    expect(definition.tables.records).toBe(records);
+    expect(getTableConfig(records).name).toBe("example_records");
+    expect(Object.isFrozen(definition)).toBe(true);
+    expect(Object.isFrozen(definition.tables)).toBe(true);
+    expect(Object.isFrozen(records)).toBe(false);
+  });
+
+  it("rejects malformed, empty, unknown, and non-PostgreSQL table definitions", () => {
+    const records = pgTable("example_records", { id: integer() });
+    const disguisedRecords = alias(records, "example_disguised_records");
+    expect(() => parseModuleSchemaDefinition({ moduleId: "example", tables: {} })).toThrow();
+    expect(() =>
+      parseModuleSchemaDefinition({ moduleId: "example", tables: { records: {} } }),
+    ).toThrow();
+    expect(() =>
+      parseModuleSchemaDefinition({ moduleId: "example", tables: { records }, extra: true }),
+    ).toThrow();
+    expect(() =>
+      parseModuleSchemaDefinition({ moduleId: "example", tables: { disguisedRecords } }),
+    ).toThrow();
+  });
+});