We are developing our new composer, and it would be useful
if we could know how posts are being created by members.
To this end, we are going to start storing the following
on post_stats, which are created at the same time as a post
is created:
* writing_device - Based on `BrowserDetection.device`, which in
turn is based on user agent. Will store .e.g iphone, android,
mac, windows etc.
* writing_user_agent - Stores the full user agent (truncated at
400 chars) of the device/browser the member used to write the post.
* composer_version - Either `1` for our old composer, or
`2` if the new rich composer is enabled in site settings and
the user has toggled it on
This reduces chances of errors where consumers of strings mutate inputs
and reduces memory usage of the app.
Test suite passes now, but there may be some stuff left, so we will run
a few sites on a branch prior to merging
- how long were people typing?
- how long was composer open?
- how many drafts were created?
- correct, draft saved to go away after you continue typing
store in Post.find(xyz).post_stat
