Add a fqn field to blogs and users (#457)

Fixes #319

plume-models/src/schema.rs

@@ -43,6 +43,7 @@ table! {
         ap_url -> Text,
         private_key -> Nullable<Text>,
         public_key -> Text,
+        fqn -> Text,
     }
 }
 
@@ -201,6 +202,7 @@ table! {
         followers_endpoint -> Varchar,
         avatar_id -> Nullable<Int4>,
         last_fetched_date -> Timestamp,
+        fqn -> Text,
     }
 }