Loads the PostgreSQL backend's SQL from .sql files — the portable source of truth shared with the Node.js/Python/other ports.

Runtime queries live under postgres/commands/ (each file is one parameterized SELECT fn(...) or direct statement); schema migrations live under postgres/migrations/. The files contain no schema/namespace references — the connection's search_path selects the schema — so they are portable verbatim.

Like BullMQ.Scripts (which prefers priv/scripts and falls back to the repo's rawScripts), this loader prefers priv/postgres and falls back to the shared src/postgres tree during local development. Results are cached in :persistent_term after the first read.