TYPO3 Core

Since #46617 it is possible to flush page caches by changing records of custom tables simply by registering additional page cache tags like tx_mytable and tx_mytable_42 through the TypoScriptFrontendController.

This feature should be documented for reasons stated in the commit message:

As suggested in the wiki it is helpful to tag caches with a combination of
table and record uid to get the cache deleted when the specific record was
edited. But rather that each extension provides its own implementation it
would be better to store this simple function into the core.