Erweitert die Backend- und Frontend-Funktionalität zur Unterstützung von Teams und Saisons. Fügt neue Routen für Team- und Club-Team-Management hinzu, aktualisiert die Match- und Team-Modelle zur Berücksichtigung von Saisons, und implementiert die Saison-Auswahl in der Benutzeroberfläche. Optimiert die Logik zur Abfrage von Ligen und Spielen basierend auf der ausgewählten Saison.

backend/migrations/add_season_to_teams.sql

@@ -0,0 +1,44 @@
+-- Migration: Add season_id to teams table
+-- First, add the column as nullable
+ALTER TABLE `team` ADD COLUMN `season_id` INT NULL;
+
+-- Get or create current season
+SET @current_season_id = (
+    SELECT id FROM `season` 
+    WHERE season = (
+        CASE 
+            WHEN MONTH(CURDATE()) >= 7 THEN CONCAT(YEAR(CURDATE()), '/', YEAR(CURDATE()) + 1)
+            ELSE CONCAT(YEAR(CURDATE()) - 1, '/', YEAR(CURDATE()))
+        END
+    )
+    LIMIT 1
+);
+
+-- If no season exists, create it
+INSERT IGNORE INTO `season` (season) VALUES (
+    CASE 
+        WHEN MONTH(CURDATE()) >= 7 THEN CONCAT(YEAR(CURDATE()), '/', YEAR(CURDATE()) + 1)
+        ELSE CONCAT(YEAR(CURDATE()) - 1, '/', YEAR(CURDATE()))
+    END
+);
+
+-- Get the season ID again (in case we just created it)
+SET @current_season_id = (
+    SELECT id FROM `season` 
+    WHERE season = (
+        CASE 
+            WHEN MONTH(CURDATE()) >= 7 THEN CONCAT(YEAR(CURDATE()), '/', YEAR(CURDATE()) + 1)
+            ELSE CONCAT(YEAR(CURDATE()) - 1, '/', YEAR(CURDATE()))
+        END
+    )
+    LIMIT 1
+);
+
+-- Update all existing teams to use the current season
+UPDATE `team` SET `season_id` = @current_season_id WHERE `season_id` IS NULL;
+
+-- Now make the column NOT NULL and add the foreign key constraint
+ALTER TABLE `team` MODIFY COLUMN `season_id` INT NOT NULL;
+ALTER TABLE `team` ADD CONSTRAINT `team_season_id_foreign_idx` 
+    FOREIGN KEY (`season_id`) REFERENCES `season` (`id`) 
+    ON DELETE CASCADE ON UPDATE CASCADE;