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I don't vouch for this product, but it's open source so you can evaluate the implementation and maybe get ideas. it also sounds like it may be exactly what you need and is actively being developed (pushed a release 2 days ago) https://github.com/PostgREST/postgrest
In addition to what secretlyyourgrandma said you could take a look at https://supabase.com/ it's an open source alternative to firebase and might provide a handy UI capability on top of a UI for your DB. Bonus- it uses Postgrest under the hood so you can treat it as a reference implementation if using that sort of architecture doesn't fit your needs.