new to ethers/web3 : How to handle reorgs?

I'm listening to events of a random contract through a websocket, and i'm getting transactions as soon as they happen on the chain then inserting them into a db.

In case of a blockchain re-org where old blocks are replaced with the blocks in the new consensus, whats the best way to handle new transactions and delete the old ones?

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the best way i can think of is listening to new blocks and on each new block call getPastEvents between the latest block – 12 blocks and latest blocks – 24 block to reconcile the events. But i dont think thats very clean(?) and is there a standard of blocks to wait for? i just chose 12 randomly