Long description fields should have been text rather than blob.

data/database.py

@@ -32,7 +32,7 @@ class Repository(BaseModel):
   namespace = CharField()
   name = CharField()
   visibility = ForeignKeyField(Visibility)
-  description = BlobField(null=True)
+  description = TextField(null=True)
 
   class Meta:
     database = db
@@ -89,7 +89,7 @@ class Image(BaseModel):
   image_id = CharField()
   checksum = CharField(null=True)
   created = DateTimeField(null=True)
-  comment = BlobField(null=True)
+  comment = TextField(null=True)
   repository = ForeignKeyField(Repository)
 
   # '/' separated list of ancestory ids, e.g. /1/2/6/7/10/