adding base db migrations.

app/migrations/20180321131740_create_callback_table.php

@@ -0,0 +1,36 @@
+<?php
+
+
+use Phinx\Migration\AbstractMigration;
+
+class CreateCallbackTable extends AbstractMigration
+{
+    public function up()
+    {
+        $table = $this->table('callback');
+        $table->addColumn('public_id', 'string', [
+            'length' => 12,
+            'null' => false,
+        ])->addIndex('public_id', [ 'name' => 'UNIQUE_public_id', 'unique' => true ]);
+
+        $table->addColumn('userid', 'integer', [
+            'null' => true,
+        ])->addForeignKey('userid', 'user', ['id'], [ 'constraint' => 'FK_user' ]);
+
+        $table->addColumn('name', 'string', [
+            'length' => 64,
+            'null' => false,
+        ]);
+
+        $table->addColumn('created_at', 'timestamp', [
+            'default' => 'CURRENT_TIMESTAMP'
+        ]);
+
+        $table->addColumn('last_request', 'timestamp', [
+            'default' => null,
+            'null' => true
+        ]);
+
+        $table->save();
+    }
+}