fix: remove :block/level in old graphs

src/main/frontend/worker/db/validate.cljs

@@ -22,6 +22,8 @@
                      (fn [{:keys [entity dispatch-key]}]
                        (let [entity (d/entity db (:db/id entity))]
                          (cond
+                           (:block/level entity)
+                           [[:db/retract (:db/id entity) :block/level]]
                            ;; missing :db/ident
                            (and (ldb/class? entity) (nil? (:db/ident entity)) (:block/title entity))
                            [[:db/add (:db/id entity) :db/ident (db-class/create-user-class-ident-from-name db (:block/title entity))]]