- Created migration scripts to establish the `upstream_providers` table and integrate it with the `models` table.
- Enhanced the proxy functionality to support dynamic upstream provider initialization and model resolution.
- Implemented API endpoints for managing upstream providers, including CRUD operations and model fetching.
- Refactored pricing calculations to accommodate upstream provider overrides and ensure accurate cost estimation.
- Updated the admin interface to allow for easy management of upstream providers and their associated models.
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