The string “null” or actually null? I have recently seen a huge amount of bot traffic which has actually no UA and just outright block it. It’s almost entirely (microsoft cloud) Azure script attacks.

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NoMoreNicksLeft 6 days ago | parent [-]

I was thinking the string "null". But if you have a better idea.

	▲	account42 6 days ago \| parent [-]
		User-Agent: '; DROP TABLE blocked_bots;