This question has already been answered on the forum. You can find more information on it here: How to migrate from SQLite to PostgreSQL?
Also, do you plan to use the same DB for multiple instances? If yes, you might run into issues. You will have to make changes to the source code to allow it to be compatible with your use case.
Also, the forum is active, and one generally receives a response within hours. We would appreciate it if you don’t tag us on every post. It only adds to our notifications and doesn’t really help