Something like this might be relatively straightforward:
Have an ItemEditHistory table. Perhaps only these fields:
id originalItemID createdAt title text editReason ?
Add field to Item table
nEdits (sum of related rows in ItemEditHistory)
When an edit occurs:
-- Insert new record (with old text and title values, and current datetime for createdAt field) from item to the ItemEditHistory
-- In the original Item record, update the text and title fields with the updated values, and update nEdits with the total of related records from ItemEditHistory table
The post could have a little button on it, indicating (if edited) the number of edits. Then just don't show that button if it hasn't been edited, to avoid clutter.
It should be straightforward to show a history of edits.
Mentioning @elvismercury because he wrote some posts on this as well.
idoriginalItemIDcreatedAttitletexteditReason ?nEdits (sum of related rows in ItemEditHistory)