Migrate data back to Image in preparation for v2

data/database.py

@@ -561,6 +561,12 @@ class Image(BaseModel):
 
   storage = ForeignKeyField(ImageStorage, index=True, null=True)
 
+  created = DateTimeField(null=True)
+  comment = TextField(null=True)
+  command = TextField(null=True)
+  aggregate_size = BigIntegerField(null=True)
+  v1_json_metadata = TextField(null=True)
+
   class Meta:
     database = db
     read_slaves = (read_slave,)