1. Each schema in your default MotherDuck database are simply merged with the Postgres schemas with the same name.
2. Except for the `main` DuckDB schema in your default database, which is merged with the Postgres `public` schema.
3. Tables in other databases are put into dedicated DuckDB-only schemas. These schemas are of the form `ddb$<duckdb_db_name>$<duckdb_schema_name>` (including the literal `$` characters).
4. Except for the `main` schema in those other databases. That schema should be accessed using the shorter name `ddb$<db_name>` instead.