The craziest way to send notification from firebase to Flutter depends on my_sql DB

Ok, I tried so hard to deal with notification in my app by specific conditions in my #my_sql DB
The background work in #flutter is kind of not easy to deal with, so here's my crazy way to achieve that:
I connect my app with #firebase and every time a new mobile open the app it rejecte it's #token in the DB
Now I create a public #PHP file that has access to my my_sql DB and #firebase