I don't care about the hitlogs and I use a captcha against spam. Is it save to flush these tables? Because Hitlogs is about 20 MB big and antispam about 5 MB. Thanx for your answer!
You can keep the hitlog table smaller by going to your App settings->Features tab and setting the number of days worth of hits to keep to 1. I don't know any easy fixes for the sessions table.
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yes, its perfectly safe to empty them.