IPTVnator SQLite DB Worker

Ownership and Flow

• Renderer service: libs/services/src/lib/database-electron.service.ts
• Preload API: apps/electron-backend/src/app/api/main.preload.ts
• IPC handlers: apps/electron-backend/src/app/events/database/
• Client: apps/electron-backend/src/app/services/database-worker-client.ts
• Protocol: apps/electron-backend/src/app/workers/database-worker.types.ts
• Thin dispatcher: apps/electron-backend/src/app/workers/database.worker.ts
• Connection: apps/electron-backend/src/app/workers/database.worker-connection.ts
• Runtime paths: apps/electron-backend/src/app/workers/worker-runtime-paths.ts
• SQL operations: apps/electron-backend/src/app/database/operations/
• Shared schema: libs/shared/database/src/lib/schema.ts
• Bundler: apps/electron-backend/build-worker.js
• Canonical guide: docs/architecture/sqlite-db-worker.md

The chain is renderer DatabaseService → preload IPC → main event handler → DatabaseWorkerClient and its request protocol → worker dispatcher → worker connection → operation module → shared @iptvnator/shared/database/schema, then response or request-scoped event back to the originating renderer. Keep SQL-heavy logic in operation modules and the worker entrypoint focused on dispatch/orchestration.

The build script produces three bundles: EPG parser, database, and playlist refresh. EPG parsing stays in its dedicated worker. Do not silently migrate lightweight download handlers or EPG-specific main-process query/mapping/fetch handlers as part of unrelated database work.

Identity, Progress, and Cancellation

requestId is generated for every client request and correlates worker event/response transport. operationId is the renderer-visible identity for long-operation progress and cooperative cancellation.

Tracked operations are save content, delete Xtream content, restore Xtream user data, delete playlist, and delete all playlists. The first four are cancellable. Delete-all is deliberately tracked with cancellable: false.

Cancellation is cooperative at chunk checkpoints. Committed chunks remain committed and the request finally rejects with AbortError. For the operation/busy lifecycle, only a terminal completed/error/cancelled event settles UI state; a cancel-requested flag may update immediately.

Inside synchronous better-sqlite3 transactions, prepared writes must use .run(). .execute() defers work and can commit a silent no-op.

Rebuild and Verify

After worker source changes:

pnpm nx test electron-backend
pnpm nx run electron-backend:build-worker
stat dist/apps/electron-backend/workers/database.worker.js

Confirm the artifact timestamp, restart Electron, then run the closest Electron E2E or CDP workflow.

For SQL output, IPTVNATOR_TRACE_DB=1 and IPTVNATOR_TRACE_SQL=1 emit only fixed, allowlisted statement types through the shared redacting summary in libs/shared/logging/src/lib/sql-trace-summary.ts; never log expanded SQL or bound values. DB transport traces remain separately redacted.