code for MySql / MariaDB to trigger / signal external script from database 4

code for MySql / MariaDB to trigger / signal external script from database
One feature I often wish MySQL / MariaDB (I’ll refer from now to just MariaDB referring to both) had was the ability to trigger or launch an  external script or open a socket connection to some external site; on a database event. Perhaps using a stored procedure in other words generate a signal /event to ...
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