fix index

Author: tinbotu

FavwatchLogModel.py

@@ -13,17 +13,17 @@ class Meta:
 
 
 class FavLog(BaseModel):
-    fav_by_screen_name = TextField()
+    fav_by_screen_name = TextField(null=False)
     fav_rough_seen = DateTimeField(default=datetime.datetime.now)
 
     screen_name = TextField(null=True)
     name = TextField(null=True)
     id_str = TextField(null=False, index=True)
     text = TextField(null=True)
-    fav_created_at = DateTimeField(default=datetime.datetime.now)
+    fav_created_at = DateTimeField(null=True)
 
     class Meta:
         db_table = 'log'
         indexes = (
-            (('screen_name', 'id_str'), False),
+            (('fav_by_screen_name', 'id_str'), False),
         )