How to check which table is called which trigger in postgresql?
You need to join that to pg_class:

SELECT trg.tgname,
       ns.nspname||'.'||tbl.relname as trigger_table
FROM pg_trigger trg
 JOIN pg_class tbl on trg.tgrelid = tbl.oid
 JOIN pg_namespace ns ON ns.oid = tbl.relnamespace
WHERE NOT tgisinternal