postgres-adopt

Postgres Adopt

The engine is the brain's foundation: PGLite is the zero-config floor, Postgres is where concurrency, multi-machine access, and 1000+ pages live. This skill answers "which one am I on?", prefers Postgres when the operator wants it, and moves data safely — never by flipping config.

Contract

This skill guarantees:

• Detection is engine-free and read-only: gbrain engine status --json answers with the database down (that is the point of the command).
• Engine changes NEVER happen by editing config. A PGLite brain moves with gbrain migrate --to postgres (alias --to supabase), which graduates it: plan first (exit 3), run only with the user's --yes --expect <plan_hash>, verify every table, then flip routing. This skill wraps it; it never reimplements it.
• The target URL never appears in a command, transcript or output: it lives in GBRAIN_TARGET_URL and every command uses --url-env GBRAIN_TARGET_URL.
• Provisioning consent is explicit: the docker rung needs --allow-docker, creating a database on a local server needs --allow-create-db. Headless mutation of infrastructure the operator didn't opt into never happens.

Step 1 — Detect

gbrain engine status --json

Branch on the output:

• effective_engine: "postgres" and (optionally) --probe says ok → report healthy, done.
• effective_engine: "postgres" but the probe fails → this is an ACCESS problem, not an adoption problem: route to db-repair.
• config_file_engine differs from effective_engine → an env URL is overriding the config file; tell the operator which one wins — the signal is db_url_source (env:GBRAIN_DATABASE_URL / env:DATABASE_URL means env wins; env.note additionally fires when both env URLs are set or the cwd-.env shadow guard excluded one).
• thin_client: true → the brain lives on a remote server; engine choices belong to that host. Stop.
• effective_engine: null (no brain) → Step 2.
• effective_engine: "pglite" with data → Step 3.
• The output has a graduation block whose state is not none (in progress, interrupted, graduated or split) → Step 4.