What should be done?

There is a significant community interest in the MySQL backend for FerretDB. While FerretDB Inc. does not have plans to author one, we could help maintain it if someone in the community wrote it.

FerretDB's architecture was recently changed to make adding new backends easier. See https://blog.ferretdb.io/ferretdb-v1-10-production-ready-sqlite/

To add a new backend, three interfaces should be implemented: https://pkg.go.dev/github.com/FerretDB/FerretDB/internal/backends. Please take a look at existing backends for examples.

Additionally, it should be hooked into our build system, integration tests, and CI configuration.

Where?

https://github.com/FerretDB/FerretDB/tree/main/internal/backends

Definition of Done

• backend created;
• unit tests added/updated;
• integration/compatibility tests added/updated;
• spot refactorings done;
• user documentation updated or an issue to create documentation created;
• something else?