Error IndexErrors people actually search for when building on AI app builders — what causes them, and how to fix them.All platformsBase44BoltLovableNetlifyRailwaySupabaseVercelv0Base44Access-control bugs that only appear with a second useruser can access another user's dataSupabase signup confirmation emails silently go to spamconfirmation email not receivedSupabase anon key in the frontend grants full read/write on every tableRow Level Security is disabled
