We recently upgraded from v9.6 to v13 but are seeing some problems. It's on AWS Aurora, so I won't ask to diagnose a heavily altered version. We're hoping for better results with v12, but when we set up logical replication from v13 to v12, while the initial data snapshot copies the data, pg_stat_replication remains empty.
There are no v13-specific features or idioms in use in the databases. As a sanity check, should it be possible to set up logical replication from a newer version of PostgreSQL to an older version? Has this scenario been tested? Has the logical replication protocol changed between versions?
Thanks in advance,
Miles Elam
