Update models to have more relationships and timestamp column definitions.

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

@@ -14,9 +14,9 @@ class Process extends Model
 {
     // Set our table name
     protected $table = 'PROCESS';
-    // We do have a created at, but we don't store an updated at
+    // Our custom timestamp columns
     const CREATED_AT = 'PRO_CREATE_DATE';
-    const UPDATED_AT = null;
+    const UPDATED_AT = 'PRO_UPDATE_DATE';
     
     /**
      * Retrieve all applications that belong to this process
@@ -26,4 +26,9 @@ class Process extends Model
         return $this->hasMany(Application::class, 'PRO_ID', 'PRO_ID');
 
     }
+
+    public function creator()
+    {
+        return $this->hasOne(User::class, 'PRO_CREATE_USER', 'USR_UID');
+    }
 }