When attempting to delete a flag with thousands of flaggings, the regular core entity delete behavior will run out of memory attempting to delete all the flaggings.
Create a flag and add a high number of flaggings (e.g. 50k).
Attempt to delete the flag from /admin/structure/flags.
The operation will fail when PHP runs out of memory while attempting to delete all related flagging entities.
Delete a flag's flagging entities in a batch operation.
Review and improve initial approach. I have attempted to use as much as the extending entity delete functionality as possible, but it does lead to some oddities (e.g. the entity deleted message and log is added before the batch operation completes).
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Needs review
4.0
Flag core
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Added a commit to make it compatible to D10 since QueryInterface::accessCheck is now required.