old_contents: import json
  
  from django.db import models
  import requests
  
  from Suchary.settings import GCM_API_KEY
  
  
  class Device(models.Model):
      registration_id = models.TextField()
      android_id = models.TextField(unique=True)
      alias = models.TextField(blank=True)
      version = models.CharField(max_length=20)
      model = models.CharField(max_length=60)
      os_version = models.CharField(max_length=20)
      type = models.CharField(max_length=20)
      active = models.BooleanField(default=True)
      last_used = models.DateTimeField(auto_now=True)
      last_seen = models.DateTimeField()
      created = models.DateTimeField(auto_now_add=True)
  
      def send_data(self, data):
          url = 'https://android.googleapis.com/gcm/send'
          header = {'Authorization': 'key=' + GCM_API_KEY, 'Content-Type': 'application/json'}
          payload = {'registration_ids': [self.registration_id], 'data': data}
          r = requests.post(url, data=json.dumps(payload), headers=header)
          return r
  
      def __str__(self):
          if self.alias:
              return str(self.alias)
          return str(self.registration_id)
new_contents: import json
  
  from django.db import models
  import requests
  
  from Suchary.settings import GCM_API_KEY
  
  
  class Device(models.Model):
      registration_id = models.TextField()
      android_id = models.TextField(unique=True)
      alias = models.TextField(blank=True)
      version = models.CharField(max_length=20)
      model = models.CharField(max_length=60)
      os_version = models.CharField(max_length=20)
      type = models.CharField(max_length=20)
      active = models.BooleanField(default=True)
      last_used = models.DateTimeField(auto_now=True)
      last_seen = models.DateTimeField(auto_now_add=True)
      created = models.DateTimeField(auto_now_add=True)
  
      def send_data(self, data):
          url = 'https://android.googleapis.com/gcm/send'
          header = {'Authorization': 'key=' + GCM_API_KEY, 'Content-Type': 'application/json'}
          payload = {'registration_ids': [self.registration_id], 'data': data}
          r = requests.post(url, data=json.dumps(payload), headers=header)
          return r
  
      def __str__(self):
          if self.alias:
              return str(self.alias)
          return str(self.registration_id)
  
subject: Fix Device model, not needed to set last_seen on creation