Clearing the clipboard without dashboard?

Can anybody tell me how it would be possible to "manually" clear the clipboard of concrete5 5.7.4 in case this can't be done from the left sidebar anymore, because a block has got stuck there and can't be deleted (a gallery block in my case). I have no idea which database table is related to clipboard content of concrete5...?

Thank you,

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hutman replied on at Permalink Best Answer Reply
The tables that are attached to the Clipboard are Piles and PileContents.
okapi replied on at Permalink Reply
Thank you so much, now i was finally able to clear the clipboard!