Autocommit is giving concurrency errors in PostgreSQL when operations
are sent in parallel. Using serializable transactions seems to fix it.

For ex:

ERROR:  deadlock detected
DETAIL:  Process 176184 waits for ShareLock on transaction 15529683; blocked by process 191002.
 Process 191002 waits for ShareLock on transaction 15529684; blocked by process 178678.
 Process 178678 waits for ExclusiveLock on tuple (1386,16) of relation 43815 of database 16391; blocked by process 176184.
 Process 176184: DELETE FROM ip_net_plan AS p WHERE vrf_id = 0 AND prefix = '10.0.10.240/28'
 Process 191002: DELETE FROM ip_net_plan AS p WHERE vrf_id = 0 AND prefix = '10.0.11.0/28'
 Process 178678: DELETE FROM ip_net_plan AS p WHERE vrf_id = 0 AND prefix = '10.0.10.208/28'
HINT:  See server log for query details.
CONTEXT:  while locking tuple (1386,16) in relation "ip_net_plan"
 SQL statement "UPDATE ip_net_plan SET children =
      (SELECT COUNT(1)
      FROM ip_net_plan
      WHERE vrf_id = OLD.vrf_id
       AND iprange(prefix) << iprange(old_parent.prefix)
       AND indent = old_parent.indent+1)
     WHERE id = old_parent.id"
 PL/pgSQL function tf_ip_net_plan__prefix_iu_after() line 92 at SQL statement
STATEMENT:  DELETE FROM ip_net_plan AS p WHERE vrf_id = 0 AND prefix = '10.0.10.240/28'