diff --git a/backend/src/app/binfile/common.clj b/backend/src/app/binfile/common.clj
index b4d7bafdcb..1781860c05 100644
--- a/backend/src/app/binfile/common.clj
+++ b/backend/src/app/binfile/common.clj
@@ -633,7 +633,7 @@
       (dissoc :team-id)
       (dissoc :migrations)))
 
-(defn file->file-data-params
+(defn- file->file-data-params
   [{:keys [id] :as file} & {:as opts}]
   (let [created-at  (or (:created-at file) (ct/now))
         modified-at (or (:modified-at file) created-at)]
diff --git a/backend/src/app/features/fdata.clj b/backend/src/app/features/fdata.clj
index 6a4bebe243..16afb9fd1a 100644
--- a/backend/src/app/features/fdata.clj
+++ b/backend/src/app/features/fdata.clj
@@ -172,16 +172,24 @@
     (= backend "legacy-db")
     (cond
       (= type "main")
-      (db/update! cfg :file
-                  {:data data}
-                  {:id file-id}
-                  {::db/return-keys false})
+      (do
+        (db/delete! cfg :file-data
+                    {:id id :file-id file-id :type "main"}
+                    {::db/return-keys false})
+        (db/update! cfg :file
+                    {:data data}
+                    {:id file-id}
+                    {::db/return-keys false}))
 
       (= type "snapshot")
-      (db/update! cfg :file-change
-                  {:data data}
-                  {:file-id file-id :id id}
-                  {::db/return-keys false})
+      (do
+        (db/delete! cfg :file-data
+                    {:id id :file-id file-id :type "snapshot"}
+                    {::db/return-keys false})
+        (db/update! cfg :file-change
+                    {:data data}
+                    {:file-id file-id :id id}
+                    {::db/return-keys false}))
 
       (= type "fragment")
       (upsert-in-database cfg
diff --git a/backend/src/data_readers.clj b/backend/src/data_readers.clj
index e32d7c506c..dd94d1aae7 100644
--- a/backend/src/data_readers.clj
+++ b/backend/src/data_readers.clj
@@ -4,7 +4,7 @@
  penpot/path-data app.common.types.path/from-string
  penpot/matrix app.common.geom.matrix/decode-matrix
  penpot/point app.common.geom.point/decode-point
- penpot/token-lib app.common.types.tokens-lib/parse-multi-set-dtcg-json
+ penpot/tokens-lib app.common.types.tokens-lib/parse-multi-set-dtcg-json
  penpot/token-set app.common.types.tokens-lib/make-token-set
  penpot/token-theme app.common.types.tokens-lib/make-token-theme
  penpot/token app.common.types.tokens-lib/make-token}
diff --git a/common/src/app/common/files/migrations.cljc b/common/src/app/common/files/migrations.cljc
index 91f5793e99..10425d4e49 100644
--- a/common/src/app/common/files/migrations.cljc
+++ b/common/src/app/common/files/migrations.cljc
@@ -75,7 +75,9 @@
         data
         (-> data
             (assoc :id id)
-            (dissoc :version :libs))]
+            (dissoc :version)
+            (dissoc :libs)
+            (ctf/check-file-data))]
 
     (-> file
         (assoc :data data)
diff --git a/common/src/app/common/types/file.cljc b/common/src/app/common/types/file.cljc
index b037831626..87e6ee739b 100644
--- a/common/src/app/common/types/file.cljc
+++ b/common/src/app/common/types/file.cljc
@@ -114,10 +114,10 @@
 (sm/register! ::typographies schema:typographies)
 
 (def check-file
-  (sm/check-fn schema:file :hint "check error on validating file"))
+  (sm/check-fn schema:file :hint "invalid file"))
 
 (def check-file-data
-  (sm/check-fn schema:data))
+  (sm/check-fn schema:data :hint "invalid file data"))
 
 (def check-file-media
   (sm/check-fn schema:media))
diff --git a/common/src/app/common/types/tokens_lib.cljc b/common/src/app/common/types/tokens_lib.cljc
index 9191aa3a2f..df7aa38cf2 100644
--- a/common/src/app/common/types/tokens_lib.cljc
+++ b/common/src/app/common/types/tokens_lib.cljc
@@ -27,6 +27,10 @@
 
 ;; === Common
 
+(defprotocol IValidation
+  (valid? [_] "check if this data structure is valid, returns true or false")
+  (check [_] "check if this data structure is valid, raises exception or self"))
+
 (defprotocol INamedItem
   "Protocol for items that have an id, a name, a description and a modified date."
   (get-id [_] "Get the id of the item.")
@@ -536,12 +540,6 @@
    [:fn d/ordered-map?]
    [:fn not-repeated-ids]])
 
-(def ^:private check-token-sets
-  (sm/check-fn schema:token-sets :hint "expected valid token sets"))
-
-(def ^:private valid-token-sets?
-  (sm/validator schema:token-sets))
-
 ;; === TokenTheme
 
 (defprotocol ITokenTheme
@@ -770,21 +768,9 @@
              [:fn d/ordered-map?]]]
    [:fn d/ordered-map?]])
 
-(def ^:private check-token-themes
-  (sm/check-fn schema:token-themes :hint "expected valid token themes"))
-
-(def ^:private valid-token-themes?
-  (sm/validator schema:token-themes))
-
 (def ^:private schema:active-themes
   [:set :string])
 
-(def ^:private check-active-themes
-  (sm/check-fn schema:active-themes :hint "expected valid active themes"))
-
-(def ^:private valid-active-token-themes?
-  (sm/validator schema:active-themes))
-
 (defn walk-sets-tree-seq
   "Walk sets tree as a flat list.
 
@@ -900,6 +886,8 @@
 ;; === Tokens Lib
 
 (declare make-tokens-lib)
+(declare ^:private check-tokens-lib-map)
+(declare ^:private valid-tokens-lib-map?)
 
 (defprotocol ITokensLib
   "A library of tokens, sets and themes."
@@ -920,8 +908,7 @@ Will return a value that matches this schema:
 `:partial` Mixed active state of nested sets")
   (get-tokens-in-active-sets [_] "set of set names that are active in the the active themes")
   (get-all-tokens [_] "all tokens in the lib")
-  (get-tokens [_ set-id] "return a map of tokens in the set, indexed by token-name")
-  (validate [_]))
+  (get-tokens [_ set-id] "return a map of tokens in the set, indexed by token-name"))
 
 (declare parse-multi-set-dtcg-json)
 (declare export-dtcg-json)
@@ -1323,14 +1310,17 @@ Will return a value that matches this schema:
             (get-set set-id)
             (get-tokens-)))
 
-  (validate [_]
-    (and (valid-token-sets? sets)
-         (valid-token-themes? themes)
-         (valid-active-token-themes? active-themes))))
+  IValidation
+  (valid? [this]
+    (valid-tokens-lib-map? (datafy this)))
+
+  (check [this]
+    (check-tokens-lib-map (datafy this))
+    this))
 
 (defmethod pp/simple-dispatch TokensLib
   [^TokensLib obj]
-  (.write *out* "#penpot/token-lib ")
+  (.write *out* "#penpot/tokens-lib ")
   (pp/pprint-newline :miser)
   (pp/pprint (export-dtcg-json obj)))
 
@@ -1338,7 +1328,7 @@ Will return a value that matches this schema:
    (do
      (defmethod print-method TokensLib
        [^TokensLib obj ^java.io.Writer w]
-       (.write w "#penpot/token-lib ")
+       (.write w "#penpot/tokens-lib ")
        (print-method (export-dtcg-json obj) w))
 
      (defmethod print-dup TokensLib
@@ -1349,16 +1339,29 @@ Will return a value that matches this schema:
    (extend-type TokensLib
      cljs.core/IPrintWithWriter
      (-pr-writer [this writer opts]
-       (-write writer "#penpot/token-lib ")
+       (-write writer "#penpot/tokens-lib ")
        (-pr-writer (export-dtcg-json this) writer opts))
 
      cljs.core/IEncodeJS
      (-clj->js [this] (clj->js (datafy this)))))
 
+(def ^:private schema:tokens-lib-map
+  "Internal data structure schema"
+  [:map {:title "TokensLib"}
+   [:sets schema:token-sets]
+   [:themes schema:token-themes]
+   [:active-themes schema:active-themes]])
+
+(def ^:private valid-tokens-lib-map?
+  (sm/lazy-validator schema:tokens-lib-map))
+
+(def ^:private check-tokens-lib-map
+  (sm/check-fn schema:tokens-lib-map :hint "invalid tokens-lib internal data structure"))
+
 (defn valid-tokens-lib?
   [o]
   (and (instance? TokensLib o)
-       (validate o)))
+       (valid? o)))
 
 (defn- ensure-hidden-theme
   "A helper that is responsible to ensure that the hidden theme always
@@ -1379,15 +1382,14 @@ Will return a value that matches this schema:
 
 (defn make-tokens-lib
   "Make a new instance of TokensLib from a map and validates the input"
-  [& {:keys [sets themes active-themes]}]
-  (let [sets          (or sets (d/ordered-map))
-        themes        (-> (or themes (d/ordered-map))
-                          (ensure-hidden-theme))
-        active-themes (or active-themes #{hidden-theme-path})]
-    (TokensLib.
-     (check-token-sets sets)
-     (check-token-themes themes)
-     (check-active-themes active-themes))))
+  [& {:as params}]
+  (-> params
+      (update :sets #(or % (d/ordered-map)))
+      (update :themes #(-> (or % (d/ordered-map))
+                           (ensure-hidden-theme)))
+      (update :active-themes #(or % #{hidden-theme-path}))
+      (check-tokens-lib-map)
+      (map->tokens-lib)))
 
 (defn ensure-tokens-lib
   [tokens-lib]
@@ -1902,7 +1904,8 @@ Will return a value that matches this schema:
     (some-> tokens-lib
             (-> (datafy)
                 (update :sets d/update-vals migrate-set-node)
-                (map->tokens-lib)))))
+                (map->tokens-lib)
+                (check)))))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; SERIALIZATION (FRESIAN)
diff --git a/common/test/common_tests/files_migrations_test.cljc b/common/test/common_tests/files_migrations_test.cljc
index f5fe884ba8..d9de5e84f2 100644
--- a/common/test/common_tests/files_migrations_test.cljc
+++ b/common/test/common_tests/files_migrations_test.cljc
@@ -9,6 +9,7 @@
    [app.common.data :as d]
    [app.common.files.migrations :as cfm]
    [app.common.pprint :as pp]
+   [app.common.types.file :as ctf]
    [clojure.test :as t]))
 
 (defmethod cfm/migrate-data "test/1" [data _] (update data :sum inc))
@@ -17,7 +18,8 @@
 
 (t/deftest generic-migration-subsystem-1
   (let [migrations (into (d/ordered-set) ["test/1" "test/2" "test/3"])]
-    (with-redefs [cfm/available-migrations migrations]
+    (with-redefs [cfm/available-migrations migrations
+                  ctf/check-file-data identity]
       (let [file  {:data {:sum 1}
                    :id 1
                    :migrations (d/ordered-set "test/1")}
diff --git a/common/test/common_tests/types/tokens_lib_test.cljc b/common/test/common_tests/types/tokens_lib_test.cljc
index 4b86480e12..f036c821df 100644
--- a/common/test/common_tests/types/tokens_lib_test.cljc
+++ b/common/test/common_tests/types/tokens_lib_test.cljc
@@ -241,7 +241,7 @@
 
 (t/deftest make-invalid-tokens-lib
   (let [params {:sets {} :themes {}}]
-    (t/is (thrown-with-msg? #?(:cljs js/Error :clj Exception) #"expected valid token sets"
+    (t/is (thrown-with-msg? #?(:cljs js/Error :clj Exception) #"invalid tokens-lib internal data structure"
                             (ctob/make-tokens-lib params)))))
 
 (t/deftest add-token-set-to-token-lib