- Add tier_id column with FK to subscription_tiers table
- Add tier_obj relationship to VendorSubscription model
- Update tier_limits property to use database tier when available
- Create migration with SQLite batch mode support
- Backfill tier_id from existing tier code values
This enables proper database relationship between vendors and their
subscription tier, instead of just storing the tier code string.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Samir Boulahtit
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