text: select
    (extract(epoch from now()) * 1e9)::int8 as epoch_ns,
    p.oid::text as tag_oid,
    quote_ident(nspname)||'.'||quote_ident(proname) as tag_sproc,
    md5(prosrc)
  from
    pg_proc p
    join
    pg_namespace n on n.oid = pronamespace
  where
    not nspname like any(array[E'pg\\_%', 'information_schema']);
  