should have article inner logger

[mydearxym]

handle situation like

• x-user lock/unlock conversion(comments) of a article when the problem solved or other reason
• article edit history with diff UI, just like the git system
• etc ..

a possible inner logger table for post would be like this:

post_loggers:

post_id	user_id	action	old_content	new_content	reason
xx	xx	lock	..	..	solved
xx	xx	edit	old blabla	new blabla	...