Maybe this is an ideal use case for a bloom filter. The answer to the question "is user X blocked?" is almost always going to be "no". And the "maybe" cases can

Maybe this is an ideal use case for a bloom filter. The answer to the question "is user X blocked?" is almost always going to be "no". And the "maybe" cases can consult the actual block list. How exciting. I've waited my whole career for a bloom filter use case. Please no one tell me that there's a much more obvious solution.