Added unique const telegram bot token

notifications/migrations/0004_auto_20161014_0145.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.2 on 2016-10-14 01:45
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('notifications', '0003_auto_20161014_0118'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='telegrambot',
+            name='token',
+            field=models.CharField(max_length=100, unique=True),
+        ),
+    ]

notifications/telegram/models.py

@@ -15,7 +15,7 @@ class TelegramBot(models.Model):
 
     name = models.CharField(max_length=25, null=False, primary_key=True)
     # allows more than one telegram bot implementation with the same token
-    token = models.CharField(max_length=100, null=False)
+    token = models.CharField(max_length=100, null=False, unique=True)
 
     module_name = models.CharField(max_length=25, null=True)