Push geo-filter: Giftköder-Alert nur im 30km-Radius, Standort via Alerts-Check gespeichert

backend/routes/push.py

@@ -140,3 +140,26 @@ def send_push_to_all(payload: dict):
             sent += 1
     logger.info(f"Push an {sent}/{len(rows)} Subscriptions gesendet.")
     return sent
+
+
+def send_push_nearby(lat: float, lon: float, radius_m: float, payload: dict):
+    """Schickt Push nur an User deren letzter bekannter Standort innerhalb radius_m liegt.
+    User ohne gespeicherten Standort werden übersprungen."""
+    import math
+    def _dist(la1, lo1, la2, lo2):
+        R = 6_371_000
+        p1, p2 = math.radians(la1), math.radians(la2)
+        a = math.sin(math.radians(la2-la1)/2)**2 + math.cos(p1)*math.cos(p2)*math.sin(math.radians(lo2-lo1)/2)**2
+        return 2*R*math.asin(math.sqrt(a))
+
+    with db() as conn:
+        rows = conn.execute(
+            "SELECT * FROM push_subscriptions WHERE last_lat IS NOT NULL"
+        ).fetchall()
+    sent = 0
+    for row in rows:
+        if _dist(lat, lon, row["last_lat"], row["last_lon"]) <= radius_m:
+            if send_push(row, payload):
+                sent += 1
+    logger.info(f"Push nearby ({radius_m/1000:.0f}km): {sent}/{len(rows)} gesendet.")
+    return sent