High-level architecture

The browser holds the editor, a sync outbox, and IndexedDB. Signed-in saves travel through the HTTP server into Postgres. Room work travels through the WebSocket server into Redis, and the flush worker later writes durable snapshots from Redis back into Postgres.

Solid lines are durable data — committed elements and database rows. Dashed lines are ephemeral — presence, previews, and other live state that is never stored.

Sources: README.md, apps/web/README.md, apps/http-server/README.md, apps/ws-server/README.md, apps/flush-worker/README.md, packages/redis/README.md (documented at commit b0026d9)