LoadFDW creates a foreign server, describing a PostgreSQL server which is accessible using the srcURL connection URL and postgres_fdw extension from within the `tx` transaction (in the destination database).

Adapter of S, U, and D wraps and adapts an instance of the Migrator[S, U, D] in order to provide the version-independent repo.Migrator[repo.SchemaSettler] interface.

DnMigAdapter interface represents an object which can be adapted to the repo.DownMigrator[repo.SchemaSettler] version-independent downwards migrator interface.

Migrator of S, U, and D is a generic interface which is created for two main purposes.

UpMigAdapter interface represents an object which can be adapted to the repo.UpMigrator[repo.SchemaSettler] version-independent upwards migrator interface.