feat: add alert history

README.md

@@ -65,6 +65,8 @@ You can now:
 - Integration with [Apprise](https://github.com/caronc/apprise)
 - Email, Slack, webhook, and more
 - Alert on new failures, compliance drops, or unknown senders
+- Daily and weekly DMARC summaries
+- Alert history for active and resolved alerts
 
 ### 🔐 User Management
 - Built-in authentication via **FastAPI Users**
@@ -100,6 +102,34 @@ Then visit [http://localhost:8080](http://localhost:8080)
 
 ---
 
+## 🚨 Integration with Apprise
+
+DMARQ sends notifications through Apprise target URLs configured in
+**Settings** > **Notifications**. Add one target URL per line, enable
+notifications, and use **Send Test** to verify delivery. Apprise supports email,
+Slack, Teams, Discord, generic webhooks, and many other targets.
+
+Notification settings include alert-rule toggles and thresholds for:
+
+- New sending sources
+- Compliance-rate drops
+- DMARC failures above a daily threshold
+- Missing reports for monitored domains
+
+DMARQ can also send daily and weekly summaries. Use **Preview Summary** to see
+the current summary payload, **Send Summary Now** for an immediate message, and
+the daily/weekly toggles to enable scheduled delivery.
+
+Alert history is available in **Settings** > **Notifications** after alerts have
+been evaluated or sent. History rows track active/resolved status, first seen,
+last seen, observed count, and alert metadata.
+
+See [Settings](docs/user_guide/settings.md) and
+[Configuration](docs/deployment/configuration.md) for examples and available
+settings.
+
+---
+
 ## 📦 Requirements
 
 - DMARC aggregate reports (XML, ZIP, or GZIP format)