feat: add alert history

docs/deployment/configuration.md

@@ -97,6 +97,10 @@ from API responses.
 | `notifications.summary_send_hour_utc` | UTC hour for scheduled summaries | `8` | `7` |
 | `notifications.summary_weekday_utc` | UTC weekday for weekly summaries, where 0 is Monday | `0` | `4` |
 
+Alert history is stored in the database-backed `alert_history` table. Current
+retention is indefinite; prune old resolved rows according to your operational
+policy if long-term storage size matters.
+
 ### Cloudflare Integration
 
 | Variable | Description | Default | Example |

docs/development/roadmap.md

@@ -83,7 +83,7 @@ Follow-up:
 
 ## Later Milestones
 
-- Notifications and alert rules. Apprise delivery, test notifications, alert-rule evaluation, and scheduled daily/weekly summaries are in place; alert history remains.
+- Notifications and alert rules. Apprise delivery, test notifications, alert-rule evaluation, scheduled daily/weekly summaries, and alert history are in place.
 - DNS health and Cloudflare read-only inspection.
 - Guided setup and operator health screens.
 - Forensic/RUF report support.

docs/milestones.md

@@ -107,7 +107,7 @@ Exit criteria:
 
 ## Milestone 7: Notifications and Alert Rules
 
-Status: In progress
+Status: Complete
 
 Goal: notify administrators when action is needed.
 
@@ -117,9 +117,7 @@ Delivered:
 - Alert rules for new sender source, compliance drop, DMARC failures above threshold, and missing reports.
 - Notification settings UI can evaluate active alerts and send the current alert summary on demand.
 - Daily and weekly DMARC summary notifications, including scheduled delivery and manual preview/send controls.
-
-Planned:
-- Alert history.
+- Alert history records active and resolved alerts with first-seen, last-seen, observed-count, and payload metadata.
 
 Exit criteria:
 - A user can receive meaningful alerts without opening the dashboard daily.

docs/todo.md

@@ -167,7 +167,7 @@ Status: Complete for the delivered reporting milestone. Alert-specific dashboard
 - [x] Add Apprise notification delivery and test notification support
 - [x] Add alert rules for new sender source, compliance drop, DMARC failures above threshold, and missing reports
 - [x] Add daily and weekly summary notifications
-- [ ] Add alert history
+- [x] Add alert history
 - [ ] DNS health guidance and Cloudflare read-only inspection
 - [ ] Guided setup and operator health pages
 - [ ] Forensic/RUF report support

docs/user_guide/settings.md

@@ -63,6 +63,12 @@ Configure daily or weekly summaries in **Settings** > **Notifications**:
 - **Preview Summary**: shows message volume, report count, and active alert count
 - **Send Summary Now**: sends the selected daily or weekly summary immediately
 
+### Alert History
+
+Alert history appears in **Settings** > **Notifications** after alerts have been
+evaluated or sent. Each row shows whether the alert is active or resolved, how
+many times it has been observed, and the latest alert detail.
+
 ### Integration Notifications
 
 Apprise supports email, Slack, Teams, Discord, generic webhooks, and many other