Postbase: open-source Firebase/Supabase alternative from a solo maker

harshalone has released Postbase, a fully open-source backend platform positioned as a self-hostable alternative to Firebase and Supabase. For indie makers wary of vendor lock-in or escalating cloud costs, a transparent, auditable codebase they can run on their own infrastructure is a meaningful option. It's early-stage and debuting via Show HN, so community scrutiny will be the real test.