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What is the major difference between FerretDB, and Tigris which you mentioned in the blog post?

Seems that both of you use the same MongoDB compatibility code under the hood.

Tigris is using FerretDB to achieve MongoDB compatibility.

The MongoDB compatibility code under the hood is FerretDB.

What is the use case of having Tigris as the backend instead of PostgreSQL?

FerretDB supports multiple backends: PostgreSQL, Tigris, with SQLite and SAP HANA being developed.