- Add materialized views for list -> subscriber counts, dashboard chart,
and dashboard aggregate stats that slow down significantly on large
databases (with millions or tens of millions of subscribers). These
slow queries involve full table scan COUNTS().
- Add a toggle to enable caching slow results in Settings -> Performance.
- Add support for setting a cron string that crons and periodically
refreshes aggregated stats in materialized views.
Closes#1019.
- Adds support for arbitrary file uploads with an admin setting to select allowed file extensions.
- Adds support for attaching media (files) to campaigns.
- Add support for `complaint` to the SES bounce processor.
- Add support for `hard/soft` to Sendgrid bounce processor.
- Add new bounce actions `None` and `Unsubscribe`.
- Add per type (`soft/hard/complaint`) bounce rule configuration to
admin settings UI.
- Refactor Cypress bounce tests.
