code: def run(self):
          
          connection = self.output().connect()
          # kill any sessions other than ours and
          # internal Redshift sessions (rdsdb)
          query = ("select pg_terminate_backend(process) "
                   "from STV_SESSIONS "
                   "where db_name=%s "
                   "and user_name != 'rdsdb' "
                   "and process != pg_backend_pid()")
          cursor = connection.cursor()
          logger.info('Killing all open Redshift sessions for database: %s', self.database)
          try:
              cursor.execute(query, (self.database,))
              cursor.close()
              connection.commit()
          except psycopg2.DatabaseError as e:
              if e.message and 'EOF' in e.message:
                  # sometimes this operation kills the current session.
                  # rebuild the connection. Need to pause for 30-60 seconds
                  # before Redshift will allow us back in.
                  connection.close()
                  logger.info('Pausing %s seconds for Redshift to reset connection', self.connection_reset_wait_seconds)
                  time.sleep(self.connection_reset_wait_seconds)
                  logger.info('Reconnecting to Redshift')
                  connection = self.output().connect()
              else:
                  raise
  
          try:
              self.output().touch(connection)
              connection.commit()
          finally:
              connection.close()
  
          logger.info('Done killing all open Redshift sessions for database: %s', self.database)
docs: Kill any open Redshift sessions for the given database.