ERROR: logical decoding requires wal_level >= logical

Root cause

PostgreSQL is not configured for logical decoding. The wal_level parameter must be set to "logical" — not "replica" or "minimal".

How to fix

1. Set wal_level = logical in postgresql.conf.
2. Restart PostgreSQL (not just reload — wal_level is a postmaster parameter):
   sudo systemctl restart postgresql
3. Verify with:
   SHOW wal_level;