Update models to have more relationships and timestamp column definitions.

workflow/engine/src/ProcessMaker/Model/Application.php

@@ -7,4 +7,23 @@ use Illuminate\Database\Eloquent\Model;
 class Application extends Model
 {
     protected $table = "APPLICATION";
+    // Our custom timestamp columns
+    const CREATED_AT = 'APP_CREATE_DATE';
+    const UPDATED_AT = 'APP_UPDATE_DATE';
+
+    public function delegations()
+    {
+        return $this->hasMany(Delegation::class, 'APP_UID', 'APP_UID');
+    }
+
+    public function parent()
+    {
+        return $this->hasOne(Application::class, 'APP_PARENT', 'APP_UID');
+    }
+
+    public function currentUser()
+    {
+        return $this->hasOne(User::class, 'APP_CUR_USER', 'USR_UID');
+    }
+
 }