Fix alerts grouped by user could occur event if the alerts by a user was less than the configured threshold
Fix new installs did not migrate alert preferences
Fix migrating alert preferences would block the installer
Fix alert preferences where not respected during alert migration from stock to add-on configuration
Adjust text around the alert pop-up marking alerts as read behavior
Use a separate css class for the recent alert marker
Convert confusing named "Alerts pop-up does not mark alerts as read" checkbox to "Alert pop-up read behavior" with the options: "Always mark alerts as read"/"Never mark alerts as read"/"Use per-alert configuration"
Add style properties "Show recent/unread alert icon on alert" and "Unread/Recent alert icon", disabled by default (previously was enabled)
Work-around surprisingly expensive add-on live-ness join when fetching alerts and instead filter by content_type
Fix some bad index selection for newer MariaDB/MySQL versions for various parts of the add-on
Fix some bad performance when using the 'unsummarize' feature
Fix bad links for profile-post summary alerts
Fix formatting of alert summarization threshold option not being a numberbox
Fix summary alerts could have a "G" as the user avatar for alerts which aren't attributed to a user
Style compatibility fix where the day-selector on the alerts page could be forced onto a new line
Rework alert summarization feature to be more performant and use less memory
Rework alert preferences
Cleanup various phrasing and add more explainer text to hopefully be less confusing
Add "Alerting preference defaults" option
Add simplified interface for alert preferences (no alerts, use defaults, use custom).
Add per-alert "Alert bell read" option to alert preferences which allows setting if each individual alert is mark-as-read when viewed in the alerts pop-up
