Supabase is an open source Firebase alternative. Start your project with a Postgres database, Authentication, instant APIs, Edge Functions, Realtime subscriptions, and Storage.

Supabase

supabase have a csharp or unity related integration?

See:  https://supabase.com/docs/reference/javascript/supabase-client there should be community based clients for csharp on that page

see:     supabase-csharp    postgrest-csharp    gotrue-csharp    realtime-csharp    storage-csharp    -

There's also a project by one of our community members to create Unity wrappers:

https://github.com/kamyker/supabase-unity

Maybe you can join his efforts there.