- Remove workspace_id from Pydantic models in project_management routes
- Remove workspace_id from SQLAlchemy and SQLite project management repos
- Remove workspace_id from worker tasks (storage keys, entity creation)
- Remove workspace_id from video dedup and title usage modules
- Remove workspace_id from generation and ingest worker tasks
- Clean workspace_id from all test files and scripts
- Remove workspace-specific test files (list_workspaces, workspace repos)
Task: #14 workspace_id 残留清理
- Implement UpgradeSubscriptionUseCase (Free→Pro→Enterprise)
- Prevent downgrades (must use cancel to return to Free)
- Auto-set quotas and expiration date on upgrade
- Implement CancelSubscriptionUseCase to downgrade to Free
- Only workspace owner can manage subscription
- Add 8 comprehensive unit tests (all passed)
Phase 4 Task 21/68 completed
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