Can a prompt replace Supabase Pro?

Be honest that this is largely 'self-host the open-source project Supabase itself is built on' rather than reimplementing it from scratch — Supabase's core trick is PostgREST, an existing open-source tool that generates a REST API directly from a Postgres schema. Deploy PostgREST via Docker Compose against your own Postgres database; it will automatically expose every table and view as a REST endpoint with filtering, and respects Postgres row-level security policies for auth, which is exactly how Supabase's own 'auth' works under the hood. Add GoTrue, also open source, also literally what Supabase itself uses, for email/password and OAuth authentication, issuing JWTs that PostgREST's row-level security policies can check. For realtime, run a small WebSocket service that listens to Postgres's logical replication stream, using a library like pg-logical-replication, and pushes row-change notifications to subscribed clients. Wire these three pieces together behind a reverse proxy (Caddy) with automatic HTTPS. Do not build a polished table-editor dashboard, edge functions, or storage buckets with CDN — those are out of scope; this replicates the API, auth, and realtime core, not the whole product. Requires hosting, a domain, and a Postgres database — all three components are open source with no licensing cost.