clawbot
763e722607
Add mutex and INSERT ON CONFLICT to CreateUser to prevent TOCTOU race where concurrent requests could create multiple admin users. Changes: - Add sync.Mutex to auth.Service to serialize CreateUser calls - Add models.CreateUserAtomic using INSERT ... ON CONFLICT(username) DO NOTHING - Check RowsAffected to detect conflicts at the DB level (defense-in-depth) - Add concurrent race condition test (10 goroutines, only 1 succeeds) The existing UNIQUE constraint on users.username was already in place. This fix adds the application-level protection (items 1 & 2 from #26). |
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