chatgpt

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+# Landkreis-Sprints
+
+Automatische Auswertung von Landkreis-Sprints bei gemeinsamen Radausfahrten.
+
+## Architektur
+
+```text
+Garmin / Wahoo / ...
+        |
+        v
+ Intervals.icu
+        |
+        | ACTIVITY_ANALYZED
+        v
+  /webhooks/intervals
+        |
+        v
+      Rust
+        |
+        +---- GET activity?intervals=true
+        |
+        +---- GET streams.json
+        |       time + latlng
+        |
+        v
+    PostgreSQL
+      + PostGIS
+        |
+        v
+ Landkreis-Grenze
+        |
+        v
+ crossing_time
+    millisecond
+        |
+        v
+  icu_interval
+        |
+        v
+ 10-Minuten-Bucket
+        |
+        v
+ Leaderboard