Trigger is used to enforce referential integrity

WITH Tr AS (SELECT
    n.nspname AS trigger_schema,
    t.tgname AS trigger_name,
    em.text AS event_manipulation,        
    c.relname AS trigger_table, 
    np.nspname AS routine_schema,
    p.proname AS routine_name,   
	EXISTS (SELECT * FROM pg_constraint AS o WHERE t.tgconstraint=o.oid AND o.contype ='t') AS is_constraint_trigger,
     (SELECT DISTINCT action_condition FROM INFORMATION_SCHEMA.triggers AS it WHERE it.trigger_schema=n.nspname AND it.event_object_table=c.relname AND it.trigger_name=t.tgname) AS action_condition,    
        CASE t.tgtype::integer & 1
            WHEN 1 THEN 'ROW'
            ELSE 'STATEMENT'
        END AS action_orientation,
        CASE t.tgtype::integer & 66
            WHEN 2 THEN 'BEFORE'
            WHEN 64 THEN 'INSTEAD OF'
            ELSE 'AFTER'
        END AS action_timing	
   FROM pg_namespace n,
    pg_class c,
    pg_trigger t,
    pg_proc p,
    pg_namespace np,
    ( VALUES (4,'INSERT'), (8,'DELETE'), (16,'UPDATE'), (32,'TRUNCATE')) em(num, text)
  WHERE n.oid = c.relnamespace 
  AND c.oid = t.tgrelid 
  AND t.tgfoid=p.oid
  AND p.pronamespace=np.oid
  AND (t.tgtype::integer & em.num) <> 0 
  AND NOT t.tgisinternal 
  AND NOT pg_is_other_temp_schema(n.oid))
SELECT trigger_schema, trigger_table, 
string_agg(trigger_name || CASE WHEN is_constraint_trigger=TRUE THEN '(constraint trigger)' ELSE '' END
|| ' ' || action_timing || ' ' || event_manipulation || ' ' || 'FOR EACH ' || action_orientation || ' EXECUTE ' || routine_name, ',<br>' ORDER BY trigger_name) AS triggers,
Count(*) AS number_of_triggers
FROM Tr
WHERE routine_name~ '^RI_FKey'
GROUP BY trigger_schema, trigger_table
ORDER BY trigger_schema, trigger_table;