add features

backend/src/services/equipment.service.ts

@@ -118,6 +118,19 @@ class EquipmentService {
     }
   }
 
+  async getCategoryById(id: string): Promise<AusruestungKategorie | null> {
+    try {
+      const result = await pool.query(
+        `SELECT * FROM ausruestung_kategorien WHERE id = $1`,
+        [id]
+      );
+      return result.rows.length > 0 ? (result.rows[0] as AusruestungKategorie) : null;
+    } catch (error) {
+      logger.error('EquipmentService.getCategoryById failed', { error, id });
+      throw new Error('Failed to fetch equipment category');
+    }
+  }
+
   // =========================================================================
   // CRUD
   // =========================================================================