Add support for jobs & queueables, migrations

- Create migration directives & migrators
- Modify Cache classes to support array manipulation
- Create Redis unit and RedisCache implementation
- Create Queueable base class and Queue class that uses Cache backend

src/orm/model/Model.ts

@@ -635,6 +635,30 @@ export abstract class Model<T extends Model<T>> extends AppClass implements Bus
         return this
     }
 
+    /**
+     * Delete the current model from the database, if it exists.
+     */
+    async delete(): Promise<void> {
+        if ( !this.exists() ) {
+            return
+        }
+
+        await this.query()
+            .where(this.qualifyKey(), '=', this.key())
+            .delete()
+
+        const ctor = this.constructor as typeof Model
+        const field = getFieldsMeta(this)
+            .firstWhere('databaseKey', '=', ctor.key)
+
+        if ( field ) {
+            delete (this as any)[field.modelKey]
+            return
+        }
+
+        delete (this as any)[ctor.key]
+    }
+
     /**
      * Cast this model to a simple object mapping model fields to their values.
      *