Enhance capacity management in DirectorWorker: Retrieve current capacity values directly from the database to prevent race conditions, calculate free capacity based on real-time data, and ensure production only occurs if sufficient storage is available. Update SQL query to check for adequate storage before returning production results.

src/worker/sql.rs

@@ -1419,8 +1419,26 @@ pub const QUERY_GET_FINISHED_PRODUCTIONS: &str = r#"
         LEFT JOIN falukant_type.product_weather_effect pwe
             ON pwe.product_id = p.product_id
            AND pwe.weather_type_id = w.weather_type_id
+        -- Prüfe, ob genug freier Lagerplatz vorhanden ist
+        LEFT JOIN (
+            SELECT 
+                br2.id AS branch_id,
+                COALESCE(SUM(fds.quantity), 0) AS stock_size,
+                COALESCE(SUM(COALESCE(fdi.quantity, 0)), 0) AS used_in_stock,
+                COALESCE(SUM(COALESCE(fdp2.quantity, 0)), 0) AS running_productions_quantity
+            FROM falukant_data.branch br2
+            LEFT JOIN falukant_data.stock fds ON fds.branch_id = br2.id
+            LEFT JOIN falukant_data.inventory fdi ON fdi.stock_id = fds.id
+            LEFT JOIN falukant_data.production fdp2 ON fdp2.branch_id = br2.id
+            GROUP BY br2.id
+        ) capacity ON capacity.branch_id = p.branch_id
     -- Wetter-Effekte derzeit aus der Qualitätsberechnung entfernt
         WHERE p.start_timestamp + INTERVAL '1 minute' * pr.production_time <= NOW()
+          -- Nur Produktionen zurückgeben, für die genug Lagerplatz vorhanden ist
+          -- running_productions_quantity enthält bereits p.quantity, daher prüfen wir:
+          -- (stock_size - used_in_stock - running_productions_quantity) >= 0
+          -- Das bedeutet: Nach Abzug aller laufenden Produktionen muss noch Platz vorhanden sein
+          AND (capacity.stock_size - capacity.used_in_stock - capacity.running_productions_quantity) >= 0
         ORDER BY p.start_timestamp;
 "#;