fix timestamp format

app.py

@@ -1,3 +1,4 @@
+from datetime import datetime
 from flask import Flask, request, jsonify
 import requests
 from urllib.parse import urlencode
@@ -14,6 +15,10 @@ def forward_get_as_post():
         api_key_q = {"token": data["key"]}
         del data["key"]
 
+    if "tst" in data:
+        point_dt = datetime.fromtimestamp(float(data["tst"]))
+        data["tst"] = point_dt.isoformat()
+
     # Forward as POST request with JSON body
     target_url = f"http://reitti:8080/api/v1/ingest/owntracks?{urlencode(api_key_q)}"
     response = requests.post(target_url, json=data)