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It would be great if it does set a limit. I just noticed a similar problem (if you can call it that) on our database as well. The file is about 25MB when uncompressed, and I'd say about 70% of it is notifications (I think in my case it isn't just forums, its a combination of stuff from all modules).
Is there an easy way to purge notifications from the system? Will disabling them remove them from the database, or just stop them accumulating?
(still using 2.0.13.1).