Read-only transaction error

I am attempting to insert data and get the following error: "cannot execute INSERT in a read-only transaction"

I found this via Google https://www.postgresql.r2schools.com/postgresql-error-cannot-execute-in-a-read-only-transaction/ but how do I get access to the files they specify (e.g. standby.signal, recovery.signal)

Is my database in recovery mode? It isn't clear via the Supabase UI.
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PostgreSQL Error: cannot execute in a read-only transaction
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