text: SELECT
      COALESCE(SUM(n_tup_ins), 0) AS n_tup_ins,
      COALESCE(SUM(n_tup_upd), 0) AS n_tup_upd,
      COALESCE(SUM(n_tup_del), 0) AS n_tup_del,
      COALESCE(SUM(n_tup_hot_upd), 0) AS n_tup_hot_upd,
      EXTRACT(EPOCH FROM NOW()) AS "timestamp"
  FROM pg_stat_user_tables;
  