(Feat-Fix): Fixed the check-in, check-out system, added a contractor payment system.

backend-deno/routes/employee-swaps.ts

@@ -221,9 +221,11 @@ router.post("/", authenticateToken, authorize("SuperAdmin"), async (ctx) => {
       }
 
       // Update the employee's department and contractor
+      // If no target contractor specified, keep the original contractor
+      const newContractorId = targetContractorId || employee.contractor_id || null;
       const [updateResult] = await connection.execute(
         "UPDATE users SET department_id = ?, contractor_id = ? WHERE id = ?",
-        [targetDepartmentId, targetContractorId || null, employeeId],
+        [targetDepartmentId, newContractorId, employeeId],
       );
 
       const affectedRows =