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Users were wiped on container recreation because they shared the backend_data volume with ephemeral pharmacy/medicine data. Postgres gets its own named volume (postgres_data) that survives deploys. - Add postgres:16-alpine service + postgres_data volume to compose - Add pg + connect-pg-simple deps - userDbGet/userDbRun helpers: PG when PG_URL set, SQLite fallback - Sessions use connect-pg-simple when pgPool available - create-admin.js: PG-aware, SQLite fallback for local dev - push_subscriptions.user_id: plain INTEGER (cross-DB FK dropped) - Tests unchanged — no PG_URL in test env = SQLite fallback Set PG_PASSWORD in server .env before next deploy. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>