On one of my sites I saw that in wp_options table there are more than a hundred thousand rows after a while they all start similar to something like: _wp_session_ _wp_session_expires_ and it mosty sas things like “you must anable payment gateways to use digital downloads” etc….

it looks like someone inserted this bad content into my database.

Question 1) Is it ok if I just delete these rows or it will harm something? Question 2) How can I prevent someone inserting things into my database again? and my password was strong anyway Question 3) what were they doing with my database? I didnt notice anything visible on my site

my most importnat question at this point is question 1

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