- Add NOT NULL constraints to soundtrack.uuid, song.uuid, and song.soundtrack_uuid
- Add corresponding DROP NOT NULL in down migration
- Update header comments to reflect combined Phase 1 & 2
This eliminates the need for a separate migration 000007 while maintaining
proper rollback capability. The NOT NULL constraints are added AFTER
all UUID backfills are complete, ensuring data integrity.
Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>
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