refs https://github.com/TryGhost/Team/issues/1470
Instead of counting the MRR by resolving all the deltas from the past until now, we should start with the current calculated MRR and resolve it until the first event. That would give a more accurate recent MRR (in exchange for a less accurate MRR for older data) and allows us to limit the amount of returned days in the future.
- Includes MRR stats service that can fetch the current MRR per currency
- The service can return a history of the MRR for every day and currency
- New admin API endpoint /stats/mrr that returns the MRR history
- Includes tests for these new service and endpoint
refs TryGhost/Team#1458
refs TryGhost/Team#1459
refs TryGhost/Team#1372
- Added a new stats service, which is divided into several categories. Currently only the 'members' category for member related stats.
- When there are missing or corrupt members status events in the DB, the totals returned by the old member stats endpoint (`/members/stats/count`) were wrong. This is fixed in the new service by counting in reverse order and starting with the actual totals.
- New Stats API, with the new `/stats/members/count-history` endpoint.
- This new endpoint also returns the paid deltas -> dashboard 5.0 will show subscribed and canceled paid members for each day
- Includes tests for the new stats service and endpoint
