Setting hibernate.default_catalog seems to have the same effect as setting hibernate.default_schema or schema on the @Table annotation, i.e. it recognizes the identifier and mentions it in debug log messages, but generated SQL does not include it.

If I set both hibernate.default_catalog and hibernate.default_schema, they seem to cancel each other out...nothing references either value.

I think for PostgreSQL, the "catalog" is the database, right? And I think that typically is inferred from the JDBC connection URL, so it's a little redundant for PostgreSQL connections.