Base44 to Supabase migration kit — schema, RLS, runbook

A generic Base44 to Supabase migration kit: one script reads a sample export (entities, fields, rows, users) and writes the schema map, the Postgres tables with row-level security policies, the auth user import file, the row loads that resolve owners by email, a before-and-after client code diff and a seven-step cutover runbook with a rollback point.

Every SQL statement is parsed with the real PostgreSQL grammar before it ships; the report page shows entities mapped, columns typed, policies created and sample rows loaded. The sample entities are placeholders, so the kit shows the method without being usable as-is; a client's real export replaces the sample and the same script regenerates everything.

A scrolling walkthrough of the generated kit is in the video below; every file in it comes from the sample export.