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I'm in/been in the same situation you are in. I'm currently using https://supabase.com/. They have a really good free plan.
Would railway.app be considered a managed database?
I understand why you might want to find a free solution, but I wanted to share that Render (where I work) has managed Postgres. You can use it for free for 90 days before deciding if you want to upgrade to a paid plan. I'd recommend a managed instance for a production environment.