ChangePasswords updates the passwords of the given roles in the current transaction.

CreateRoleIfNotExists creates the `role` role if it does not exist right now.

CreateSchema tries to create the `schema` schema.

DropCascade drops `schema` schema with cascading, dropping all dependent objects recursively.

DropIfExists drops the `schema` schema without cascading if it exists.

DropServerIfExists drops the `serverName` foreign server, if it exists, with cascade.

GrantFDWUsage grants the USAGE privilege on the postgres_fdw extension to the `role` role.

GrantPrivileges grants ALL privileges on the `schema` schema to the `role` role, so it may create or access tables in that schema and run relevant queries.

InstallFDWExtensionIfMissing creates the postgres_fdw extension assuming that its relavant .so files are available in proper paths.

New instantiates a schema management Repo struct.

SetSearchPath alters the given database role and sets its default search_path to the given schema name alone.

Repo represents a schema management repository.