I believe you have installed a plugin called “Ninja Forms”, this plugin creates temporary data in the posts table, the Sucuri plugin detects this and reports the changes in the post with ID 121124 to you, then when “Ninja Forms” finishes doing its job (whatever it is) deletes the temporary post and that’s why you cannot find it in the database anymore.
From a message that I posted more than a year ago [1]:
There are many plugins in the WordPress market that use the posts table to store temporary or segmented data, this is because WordPress does not supports the creation of separated tables to process data independently, plugin/theme developers usually hook the predefined WordPress functions to insert their data in the same table as the posts and pages but set a flag in one of the columns to differentiate them so they do not appear in the normal interfaces, but they still appear as “posts” in the actions triggered by WordPress and monitored by the plugin, so for example, if one of those plugins is creating a temporary entry in the posts table (like contact form or feedback plugins do) they will appear and dissapear in the audit logs like you saw. Please check the “Ignore Alerts” in the plugin’ settings page to disable the alerts for specific post-types like this one.
[1] https://ww.wp.xz.cn/support/topic/nf_sub-message/
Thanks for the information, much appreciated!
