- Add google_tts/google_tts entry to models.yaml (16 USD/1M chars, WaveNet tier)
- Add scripts/migrate_video_accessibility.py for historical data backfill:
migrates 25 users and 103 jobs (Gemini + TTS usage records) from
accessible_video MongoDB into cost tracker
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>