ow_newsfeed_activity is our second largest table in our database after ow_base_question_data when it comes to the amount of rows. I want to make our database more efficient and get rid of unneeded rows and/or out of date data. As ow_newsfeed_activity has over 400,000 rows I would like to know if its ok to go ahead and remove data from the first month or two etc, will this have any negative effects? Cause any errors etc?