feat(security): RLS default-deny on all tables (closes #144)#7
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…n96#144) Migration 0002, adapted from cpatpa/PIP's 0011_rls.sql to Supabase: enable + force RLS on every public table and revoke grants from anon / authenticated, with no policies → default-deny for the public key while the service-role backend (BYPASSRLS) is unaffected. Verified on staging: RLS on 27/27 tables; reading projects via PostgREST returns 401 (anon) / 403 (authenticated user JWT); backend org APIs and the signup/provisioning SECURITY DEFINER triggers keep working. Safe because Mike's frontend never queries tables directly (auth-only) and all data flows through the backend. Per-row policies + a service-role -> user-JWT refactor (to also guard the backend path) remain deferred. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Migration 0002 (PIP-adapted). Enables RLS + revokes anon/authenticated grants → default-deny; service-role backend unaffected. Verified on staging: 27/27 tables RLS-on, PostgREST reads denied (401/403), backend APIs still work. Closes the upstream-willchen96#144 cross-tenant exposure gap. Per-row policies + user-JWT refactor deferred.