pha stats: expired claim attempt

[mikehelmick]

TL;DR

Number of times that expired (not invalid) codes were attempted to be claimed.

ideally an indicator of someone who go a real code but tried to use it too late.

[sethvargo]

I see two use cases here:

1. You issued a code to one person and that one person did not claim it in time.

   I think this use case isn't solved by stats. The stats won't tell you which user expired, and we intentionally don't have that data link.

2. You issued a bunch of codes that expired before they were claimed.

   While this data might be useful, it's not actionable. You can't re-issue the codes because there's no link back to the patient (by design).

[sethvargo]

The backend piece of this is done. We opted to go for "failed" instead of "expired" which encompasses:

• codes that were definitely expired
• codes that don't exist in the database (could be super-expired or a typo)