Supabase Signup Trigger Debugger

Paste redacted notes for Database error saving new user, public.handle_new_user, profile-row triggers, or Function Search Path Mutable warnings and generate a launch-safe debug plan.

Use this when

1
Signup suddenly failsSupabase auth returns a database error after a trigger or profile-table change.
2
Security Advisor also complainsThe same function has a Function Search Path Mutable warning.
3
You need a small rollback planThe fix must preserve signup, profile inserts, grants, and rerunnable evidence.

Project label Paste redacted trigger, function, grant, error, or log notes

Use redacted notes only. Do not paste secrets, private connection strings, real user rows, customer records, payment data, private screenshots, full names, private handles, full transaction identifiers, credential values, service-role keys, or dashboard screenshots. This page runs locally in the browser and does not use network requests, browser storage, or a backend.

Ready.

Debug plan

Signup-safe fix order

Find the exact failing side effect first: trigger exception, missing profile-table permission, broken metadata assumption, constraint failure, or stale trigger reference.
If public.handle_new_user is involved, make the function security definer with a function-level set search_path = '' when compatible, then schema-qualify every table reference.
Keep trigger teardown and recreation commands in the migration so a stale trigger does not continue calling an old function signature.
Smoke-test one redacted signup after the migration and prove the profile row is created without exposing personal data.
Review grant execute separately. Trigger helper functions usually do not need direct execution by public, anon, or authenticated.
Rerun Security Advisor and keep the non-sensitive evidence packet with pg_proc.proconfig, trigger name, rollback command, and signup smoke-test result.

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Need a second pass?

The fixed-scope report can review one redacted Supabase signup trigger packet: likely root cause, search-path patch shape, grants to tighten, rollback command, and the exact signup smoke tests to run before launch.

Buy $25 Supabase report Open RPC/view audit

Source-backed problem set

Supabase user management Official docs show the public.handle_new_user trigger pattern with function-level search_path. Database error saving new user Official troubleshooting says auth user insert errors are often trigger or side-effect failures. User-management errors Official troubleshooting covers auth trigger permissions and security definer behavior. Live builder failure shape Public question combines public.handle_new_user, signup failure, and the Security Advisor warning.