Missing UNIQUE constraint on auth.users email column causing signup failures
Issue: New user signups are failing with "Database error saving new user" (HTTP 500).
Root Cause: The auth.users table is missing a UNIQUE constraint on the email column.
It only has a partial unique index (users_email_partial_key WHERE is_sso_user = false),
but GoTrue's internal code uses ON CONFLICT (email) which requires a full UNIQUE constraint.
Error from Postgres logs:
ERROR: there is no unique or exclusion constraint matching the ON CONFLICT specification (SQLSTATE 42P10)
We cannot add the constraint ourselves because:
Root Cause: The auth.users table is missing a UNIQUE constraint on the email column.
It only has a partial unique index (users_email_partial_key WHERE is_sso_user = false),
but GoTrue's internal code uses ON CONFLICT (email) which requires a full UNIQUE constraint.
Error from Postgres logs:
ERROR: there is no unique or exclusion constraint matching the ON CONFLICT specification (SQLSTATE 42P10)
We cannot add the constraint ourselves because:
- ALTER TABLE auth.users ADD CONSTRAINT users_email_key UNIQUE (email);
- Returns: "ERROR: 42501: must be owner of table users"
