Postgresql runs 99% cpu, maas ui/api hangs

  pid   | datname | usename  |                                                                                                                                                                                     query                                                                                                                                                                                      
--------+---------+----------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
   5186 |         |          | 
   5188 |         | postgres | 
  23217 | maas_db | stack    | COMMIT
 145755 | maas_db | stack    | COMMIT
  23227 | maas_db | stack    | LISTEN sys_vault_migration;
  23231 | maas_db | stack    | COMMIT
  23230 | maas_db | stack    | COMMIT
  23232 | maas_db | stack    | COMMIT
  23242 | maas_db | stack    | COMMIT
  23238 | maas_db | stack    | SELECT "maasserver_rdns"."id", "maasserver_rdns"."created", "maasserver_rdns"."updated", "maasserver_rdns"."ip", "maasserver_rdns"."hostname", "maasserver_rdns"."hostnames", "maasserver_rdns"."observer_id" FROM "maasserver_rdns" WHERE ("maasserver_rdns"."ip" = '10.209.86.96'::inet AND "maasserver_rdns"."observer_id" = 1) ORDER BY "maasserver_rdns"."id" ASC LIMIT 1
  23244 | maas_db | stack    | COMMIT
  23243 | maas_db | stack    | SET default_transaction_isolation TO DEFAULT
  23250 | maas_db | stack    | COMMIT
 158126 | maas_db | stack    | COMMIT
 151720 | maas_db | stack    | SELECT "django_session"."session_key" FROM "django_session" WHERE ("django_session"."expire_date" > '2024-01-18T07:28:04.957851'::timestamp AND "django_session"."session_key" IN ('6wywxrw60nwggv8223mathghnva1v88z'))
 156390 | maas_db | stack    | COMMIT
 156707 | maas_db | stack    | COMMIT
 155141 | maas_db | stack    | COMMIT
 157824 | maas_db | stack    | COMMIT
 156599 | maas_db | stack    | COMMIT
  23360 | maas_db | stack    | UNLISTEN sys_dhcp_1;
  23367 | maas_db | stack    | LISTEN sys_dhcp_1;
 155147 | maas_db | stack    | COMMIT
  23376 | maas_db | stack    | LISTEN sys_core_25;
  23383 | maas_db | stack    | UNLISTEN sys_dhcp_1;
 155143 | maas_db | stack    | SELECT "django_session"."session_key" FROM "django_session" WHERE ("django_session"."expire_date" > '2024-01-18T07:27:59.957833'::timestamp AND "django_session"."session_key" IN ('6wywxrw60nwggv8223mathghnva1v88z'))
 156710 | maas_db | stack    | SET default_transaction_isolation TO DEFAULT
 156698 | maas_db | stack    | COMMIT
 156708 | maas_db | stack    | COMMIT
 157085 | maas_db | stack    | COMMIT
 157850 | maas_db | stack    | COMMIT
 156712 | maas_db | stack    | SELECT "django_session"."session_key" FROM "django_session" WHERE ("django_session"."expire_date" > '2024-01-18T07:28:09.957884'::timestamp AND "django_session"."session_key" IN ('6wywxrw60nwggv8223mathghnva1v88z'))
 156003 | maas_db | stack    | SELECT "django_session"."session_key" FROM "django_session" WHERE ("django_session"."expire_date" > '2024-01-18T07:27:49.957553'::timestamp AND "django_session"."session_key" IN ('6wywxrw60nwggv8223mathghnva1v88z'))
 155145 | maas_db | stack    | SELECT "django_session"."session_key" FROM "django_session" WHERE ("django_session"."expire_date" > '2024-01-18T07:27:54.957605'::timestamp AND "django_session"."session_key" IN ('6wywxrw60nwggv8223mathghnva1v88z'))
 156688 | maas_db | stack    | COMMIT
 156389 | maas_db | stack    | SET default_transaction_isolation TO DEFAULT
 156391 | maas_db | stack    | COMMIT
 155893 | maas_db | stack    | COMMIT
 156713 | maas_db | stack    | COMMIT
 156781 | maas_db | stack    | COMMIT
 155682 | maas_db | stack    | COMMIT
 156626 | maas_db | stack    | COMMIT
 156709 | maas_db | stack    | COMMIT
 157742 | maas_db | stack    | COMMIT
 158246 | maas_db | postgres | SELECT pid, datname, usename, query FROM pg_stat_activity;                                                                                                                                                                                                                                                                                                                    +
        |         |          | 
   5184 |         |          | 
   5183 |         |          | 
   5185 |         |          | 
(48 rows)