The completion_date field is automatically set by the backend (auto_now_add) and should not be sent in the create request. Removed this field from TaskCompletionCreateRequest to match the API expectations. Backend TaskCompletion model sets completion_date automatically, so clients should not provide it when creating a completion. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>