refs https://github.com/TryGhost/Ghost/pull/12541
refs https://github.com/TryGhost/Ghost/pull/12689
- the analytics job had been switched to create it's own instance of EmailAnalyticsService to avoid requiring logging but the analytics extraction branch was created before this change and wasn't picked up when merging
- pulled `queries` option object into a separate file for re-use
- updated `fetchLatest` job to conform to extracted library interface
closes https://github.com/TryGhost/Team/issues/493
- all functionality except that directly related to Ghost's database and business logic now lives in external packages
- @tryghost/email-analytics-service
- @tryghost/email-analytics-provider-mailgun
no issue
- added `EmailAnalyticsService`
- `.fetchAll()` grabs and processes all available events
- `.fetchLatest()` grabs and processes all events since the last seen event timestamp
- `EventProcessor` passed event objects and updates `email_recipients` or `members` records depending on the event being analytics or list hygiene
- always returns a `EventProcessingResult` instance so that progress can be tracked and merged across individual events, batches (pages of events), and total runs
- adds email_id and member_id to the returned result where appropriate so that the stats aggregator can limit processing to data that has changed
- sets `email_recipients.{delivered_at, opened_at, failed_at}` for analytics events
- sets `members.subscribed = false` for permanent failure/unsubscribed/complained list hygiene events
- `StatsAggregator` takes an `EventProcessingResult`-like object containing arrays of email ids and member ids on which to aggregate statistics.
- jobs for `fetch-latest` and `fetch-all` ready for use with the JobsService
- added `initialiseRecurringJobs()` function to Ghost bootup procedure that schedules the email analytics "fetch latest" job to run every minute
