close the stable door after the horse has bolted

Meaning: (idiomatic)Toattempttopreventaproblemthat has alreadyoccurred; to design and implement apreventivemechanismthat is too late (after the first failure instead of before).2019May 15,Ian C. Lucas, “WhatsApp Data Breach”, inparliamentary debates(House of Commons)‎[1], column242:We are now in an election period, with WhatsApp and closed Facebook groups being used, as we speak, in electoral campaigning, but the law has not changed since the DCMS Committee, on which I serve, raised these issues. We have yet another instance ofshutting the door after the horse has bolted.

Examples:

EN: We always close the stable door after the horse has bolted.
ES: A buenas horas, mangas verdes.

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