Where every record came from and what changed since: the batch that wrote it, the person who edited it, the field that moved.
Every write is attributed. An import, a scrape or a capture is a batch; a person's edit is an entry. A record's history shows both, so a wrong price can be traced to the feed that set it or the person who changed it.
In the admin
Generate your starting point in the console, or have us build it for you; the module is already there.