reconstruction of the project

app/Models/PlacementBatch.php

@@ -2,11 +2,15 @@
 
 namespace App\Models;
 
-use Illuminate\Database\Eloquent\Model;
+use App\Models\BaseModel;
 
-class PlacementBatch extends Model
+class PlacementBatch extends BaseModel
 {
     protected $table = 'placement_batches';
+
+    // ✅ CI: useTimestamps = true (created_at/updated_at)
+    public $timestamps = true;
+
     protected $fillable = [
         'placement_test',
         'school_year',
@@ -15,5 +19,20 @@ class PlacementBatch extends Model
         'created_at',
         'updated_at',
     ];
-    public $timestamps = true;
+
+    protected $casts = [
+        'created_by' => 'integer',
+        'updated_by' => 'integer',
+    ];
+
+    /* Optional relationships */
+    public function creator()
+    {
+        return $this->belongsTo(User::class, 'created_by');
+    }
+
+    public function updater()
+    {
+        return $this->belongsTo(User::class, 'updated_by');
+    }
 }