---

SELECT
    fk.confrelid::regclass AS referenced_table,
    pg_get_constraintdef(fk.oid) AS reference_definition
FROM pg_constraint fk
JOIN pg_attribute a
    ON a.attrelid = fk.conrelid
   AND a.attnum = ANY(fk.conkey)
WHERE fk.conrelid = 'back_office.operation'::regclass
  AND fk.contype = 'f'
  AND a.attname = 'ops_payment_return_id';