Refactor weather update query in WeatherWorker: Simplified the SQL logic for assigning random weather types to regions by removing unnecessary joins and using a subquery for random selection. Enhanced comments for clarity on the individual weather assignment process for each region.

src/worker/weather.rs

@@ -12,6 +12,7 @@ pub struct WeatherWorker {
 
 // Query zum Aktualisieren des Wetters für alle Regionen
 // Wählt für jede Region ein zufälliges Wetter aus allen verfügbaren Wettertypen aus
+// Wichtig: Jede Region bekommt ein individuelles, zufälliges Wetter
 const QUERY_UPDATE_WEATHER: &str = r#"
     WITH all_regions AS (
         SELECT DISTINCT r.id AS region_id
@@ -19,21 +20,16 @@ const QUERY_UPDATE_WEATHER: &str = r#"
         JOIN falukant_type.region tr ON r.region_type_id = tr.id
         WHERE tr.label_tr = 'city'
     ),
-    all_weather_types AS (
-        SELECT id AS weather_type_id, ROW_NUMBER() OVER (ORDER BY RANDOM()) AS rn
-        FROM falukant_type.weather
-    ),
     random_weather AS (
         SELECT 
             ar.region_id,
-            awt.weather_type_id
+            (
+                SELECT wt.id
+                FROM falukant_type.weather wt
+                ORDER BY RANDOM()
+                LIMIT 1
+            ) AS weather_type_id
         FROM all_regions ar
-        CROSS JOIN LATERAL (
-            SELECT weather_type_id
-            FROM all_weather_types
-            ORDER BY RANDOM()
-            LIMIT 1
-        ) awt
     )
     INSERT INTO falukant_data.weather (region_id, weather_type_id)
     SELECT rw.region_id, rw.weather_type_id