Why is `prisma db push` hanging?

Question

prisma db push hangs and then returns

Error: P1017

Server has closed the connection.

and when I look at what it's doing, I see:

SELECT query FROM pg_stat_activity WHERE usename='...';
                                       query
------------------------------------------------------------------------------------
             SELECT t.typname as name, e.enumlabel as value, n.nspname as namespace
             FROM pg_type t
             JOIN pg_enum e ON t.oid = e.enumtypid
             JOIN pg_catalog.pg_namespace n ON n.oid = t.typnamespace
             WHERE n.nspname = ANY ( $1 )
             ORDER BY e.enumsortorder

The wait_event_type, wait_event, and state columns were Client, ClientRead, and idle, respectively

Why would this query hang, and how can I get it to stop? This is a fly.io Postgres 14.4 database.