Ekklesia/templates/module/README.md

Ekklesia module template

This is the smallest supported Ekklesia module product. It proves the static manifest, compiled runtime and schema entrypoints, capability registration, a module-owned Drizzle table, a generated module-owned migration, logical storage-bucket declarations, and one permissioned HTTP route (GET /records, declared in register) that reads that table through context.services.database — the platform-provided ModuleDatabase facade, never a module-constructed Drizzle instance or a raw pg client. Migration execution and storage provisioning are intentionally not included.

It also ships two independently optional React roles: a primary/management UI at src/ui/index.tsx and a full-viewport display at src/display/index.tsx. One invocation of pnpm build compiles each declared role to the exact artifact in entrypoints.ui and entrypoints.display.artifact (ADR 0023). Both default-export the same role-neutral defineModuleUi({ id, version, mount }) ABI and receive the same ModuleUiHostContext; there is deliberately no mode flag. The manifest entrypoint and the host route choose the role.

Either role can be omitted independently. To remove only the display example, delete src/display/ and entrypoints.display (and remove example.display.view if nothing else uses it). To keep the module backend-only, also delete src/ui/, tsconfig.ui.json, tsconfig.ui-test.json, tests/module-ui.test.ts, the ui entrypoint, and the React/module-UI dependencies. The builder succeeds with an empty artifact list when neither role is declared.

tests/module-ui.test.ts builds both artifacts from source, validates them with parseModuleUiExport, mounts each into a real DOM, and unmounts it. Ekklesia mounts the primary UI inside its Dashboard shell and serves the display without Dashboard chrome at the stable /display/example page. See Declaring UI entrypoints.

To create a module inside this repository:

1. Copy this directory to modules/<module-id>.
2. Rename the package in package.json and remove private when it is ready for publication.
3. Update the ID, name, version, namespaces, compatibility ranges, and bucket requests in ekklesia.module.json.
4. Keep the manifest capability versions and dependency ranges aligned with the contracts the module actually implements and consumes.
5. Replace src/server/index.ts with backend behavior only. Its defineModuleRuntime ID and version must match the manifest; do not duplicate the rest of the manifest in TypeScript. Declare HTTP routes only in register, against a permission the manifest already declares; start, stop, and every route handler — never register — receive context.services.database, a typed ModuleDatabase view over the platform's one PostgreSQL pool.
6. Replace the pure Drizzle declarations in src/schema/tables.ts and keep its table prefix aligned with the module ID. Keep the defineModuleSchema ownership wrapper in src/schema/index.ts aligned too, and never import another module's schema.
7. Update drizzle.config.ts, generate forward migrations with pnpm migration:generate --name=lowercase_name from the module directory, and review the SQL. Keep each generated tag in drizzle/meta/_ekklesia.json, classify it as none or approval-required, and change that file's moduleId when renaming the template.
8. Run pnpm install, pnpm build, pnpm modules:validate, pnpm migrations:validate, and pnpm verify from the repository root. The declared production entrypoint is the compiled dist/server/index.js, not source TypeScript; the schema entrypoint is likewise compiled to dist/schema/index.js.

That modules/<module-id> directory is where a module is developed. An installation never runs it from there: Ekklesia's image contains no modules, and an installation installs a self-contained copy of the module, with its own production dependencies, into its module storage (An installed module is self-contained, ADR 0048). Copying dist/ alone is not enough, because the compiled server code imports the Module SDK and Drizzle by name.

The module owns its feature screens and display renderer. Do not add platform navigation, the containing shell, global theme, authentication screens, or top-level routing; those belong to surfaces and Core. A module UI asks its host for relative API paths and realtime state, and never hardcodes Ekklesia routes. The display permission is enforced by the host before it serves the page or descriptor; context.permissions remains a presentation-only hint. Keep imports side-effect-free, register capabilities in register, acquire resources in start, and release them in stop. Never construct a Drizzle instance, read DATABASE_URL, or reach for a raw pg client — context.services.database is the only supported way to query this module's own tables, and it is never available during register.

The migration directory uses the pinned stable Drizzle Kit 0.31.10 PostgreSQL journal and snapshot format. Migrations are forward-only and may modify only this module's objects. Offline validation treats SQL as opaque bytes, calculates SHA-256 from the exact contents, and never opens a database or executes SQL. Destructive declarations are review metadata, not automatic SQL classification or approval.