How can I setup a delete Trigger on AWS RDS - amazon-web-services

Question

I have a setup on AWS RDS with MariaDB 10.3. I have several DBs on the RDS instance. I'm trying to replicate a table (routes) from one DB (att) to another DB (pro) using triggers. I have triggers for create, update and delete. The create and update triggers works fine while the delete trigger gives the error message below. I've tested all triggers locally and they work.
My trigger looks like this.
CREATE DEFINER=`root`#`%` TRIGGER routes_delete AFTER DELETE ON
`routes` FOR EACH ROW
BEGIN
DELETE FROM `pro`.`routes`
WHERE `route_id` = OLD.route_id;
END
Error message
Query execution failed
Reason:
SQL Error [1442] [HY000]: (conn:349208) Can't update table 'routes' in
stored function/trigger because it is already used by statement which
invoked this stored function/trigger
Query is : DELETE FROM `att`.routes WHERE route_code = 78 AND company_id = 3
I don't understand what other statement is using the routes table since there is nothing else linked to it. What adjustment is needed to get this work on AWS RDS?

Answer 1

what other statement is using the routes table
The "other" query is the query that invoked the trigger.
...is already used by [the] statement which invoked this stored function/trigger
A trigger is not allowed to modify its own table. BEFORE INSERT and BEFORE UPDATE triggers can modify the current row before it is written to the table using the NEW alias, but that is the extent to which a trigger can modify the table where it is defined.
Triggers are subject to all the same limitations as stored functions, and a stored function...
Cannot make changes to a table that is already in use (reading or writing) by the statement invoking the stored function.
https://mariadb.com/kb/en/library/stored-function-limitations/