first commit

backend/app/services/alerts.py

@@ -0,0 +1,39 @@
+from datetime import date, datetime, timedelta, timezone
+
+from sqlalchemy.orm import Session
+
+from app.config import settings
+from app.models import AlertDispatch, OutboundClick
+from app.services.email import send_email
+
+TICKET_KINDS = ("bookmyshow", "district")
+
+
+def maybe_notify_click_spike(db: Session) -> None:
+    if not settings.smtp_configured:
+        return
+
+    since = datetime.now(timezone.utc) - timedelta(hours=24)
+    count = (
+        db.query(OutboundClick)
+        .filter(OutboundClick.created_at >= since, OutboundClick.link_kind.in_(TICKET_KINDS))
+        .count()
+    )
+    if count < settings.alert_click_threshold:
+        return
+
+    alert_key = f"click_spike_{date.today().isoformat()}"
+    if db.query(AlertDispatch).filter(AlertDispatch.alert_key == alert_key).first():
+        return
+
+    send_email(
+        subject=f"Desi Clans — ticket click spike ({count} in 24h)",
+        body=(
+            f"Ticket outbound clicks in the last 24 hours: {count}\n"
+            f"Threshold: {settings.alert_click_threshold}\n"
+            f"City: Bengaluru\n"
+            "Check admin analytics for details."
+        ),
+    )
+    db.add(AlertDispatch(alert_key=alert_key))
+    db.commit()