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I totally agree with the request for a lightweight DB out of box..

There is https://easydb.io which is nice and works OK with Retool but is NoSQL.. an equivalent for a relational DB would be great.

Supabase[1] provides full Postgres databases which take ~2 mins to spin up. You can connect Retool with the DB connection details in the settings

Disclaimer: I work at Supabase

s/disclaimer/disclosure