Migrate to Pydantic V2

Problem to solve

AI Gateway is using Pydantic v1 for internal domain modelling. It is also a dependency of FastAPI library. FastAPI has added support of Pydantic v2 since 0.100.x and plan to deprecate support for Pydantic v1 in the near future. Pydantic v2 would also come with some performance boost.

Proposal

Migrate to Pydantic v2.

• Use the officially supported package to help with rewriting code https://github.com/pydantic/bump-pydantic
• Ensure all tests passed and server is operational.
• 🎉

Further details

Links / references

• FastAPI support https://github.com/tiangolo/fastapi/releases/tag/0.100.0
• Migration guide https://docs.pydantic.dev/2.0/migration/
• Pydantic v2 announcement https://docs.pydantic.dev/latest/blog/pydantic-v2-final/