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I don't know how you are going to deal with DB migration, so I just created a sql file "backend/drizzle/uuid_pk.sql", and it should be tested carefully.
The last commit is about generating UUID by Postgres. This way is easier to use UUIDv7 in the future, and it's more suitable for Cella to cooperate with other systems and other languages.
If you want to check the code that generates the UUID by TS code, please check the next to last commit "Migrate to UUID primary keys", thanks.