# Troubleshooting Guide

## Versions Not Being Created

**Symptoms:** Entity updates don't create versions

**Solutions:**
1. Check if triggers are enabled: `SELECT * FROM pg_trigger WHERE tgname LIKE '%version%';`
2. Verify session variables are set in edge function
3. Check trigger function logs in Supabase dashboard
4. Ensure entity table has trigger attached

## "Cannot read versions" Error

**Symptoms:** Frontend can't fetch versions

**Solutions:**
1. Check RLS policies on version tables
2. Verify user authentication (is `auth.uid()` valid?)
3. Check entity exists
4. Inspect browser console for specific error

## Version History Not Showing in UI

**Symptoms:** Component renders but no versions display

**Solutions:**
1. Verify `useEntityVersions` hook is called correctly
2. Check entity ID is correct
3. Inspect network tab for failed queries
4. Check if versions exist in database

## Rollback Fails

**Symptoms:** "Permission denied" or rollback doesn't work

**Solutions:**
1. Verify user has moderator role: `SELECT has_role(auth.uid(), 'moderator')`
2. Check target version exists
3. Ensure entity hasn't been deleted
4. Check MFA requirement (`has_aal2()`)

## Attribution Issues

**Symptoms:** Versions attributed to moderator instead of submitter

**Solutions:**
1. Verify edge function sets `app.current_user_id` to `submission.user_id`
2. Check session variables before entity update
3. Review trigger function logic

## Performance Issues

**Symptoms:** Slow version queries

**Solutions:**
1. Check indexes exist on version tables
2. Run `cleanup_old_versions()` to reduce table size
3. Implement pagination for large version lists
4. Use `is_current = true` filter when only latest version needed

## Need Help?

- Review [ARCHITECTURE.md](./ARCHITECTURE.md) for system design
- Check [SCHEMA.md](./SCHEMA.md) for database structure
- See [FRONTEND.md](./FRONTEND.md) for React integration
- Consult [MODERATION.md](./MODERATION.md) for workflow issues