docs: def emit_db_sequence_updates(self):
          """Set database sequence objects to match the source db
  
             Relevant only when generated from SQLAlchemy connection.
             Needed to avoid subsequent unique key violations after DB build."""
  
          if self.source.db_engine and self.source.db_engine.name != 'postgresql':
              # not implemented for other RDBMS; necessity unknown
              conn = self.source.db_engine.connect()
              qry = """SELECT 'SELECT last_value FROM ' || n.nspname || '.' || c.relname || ';'
                       FROM   pg_namespace n
                       JOIN   pg_class c ON (n.oid = c.relnamespace)
                       WHERE  c.relkind = 'S'"""
              result = []
              for (sequence, ) in list(conn.execute(qry)):
                  qry = "SELECT last_value FROM %s" % sequence
                  (lastval, ) = conn.execute(qry).first()
                  nextval = int(lastval) + 1
                  yield "ALTER SEQUENCE %s RESTART WITH %s;" % nextval