diff --git a/backend/src/uxbox/services/mutations/pages.clj b/backend/src/uxbox/services/mutations/pages.clj
index 67118fc998..6ff29dd725 100644
--- a/backend/src/uxbox/services/mutations/pages.clj
+++ b/backend/src/uxbox/services/mutations/pages.clj
@@ -177,8 +177,7 @@
               :context {:incoming-revn (:revn params)
                         :stored-revn (:revn page)}))
   (let [sid      (:session-id params)
-        changes  (->> (:changes params)
-                      (mapv #(assoc % :session-id sid)))
+        changes   (:changes params)
 
         page (-> page
                  (update :data blob/decode)
diff --git a/common/uxbox/common/pages_helpers.cljc b/common/uxbox/common/pages_helpers.cljc
new file mode 100644
index 0000000000..1bcc63d3d1
--- /dev/null
+++ b/common/uxbox/common/pages_helpers.cljc
@@ -0,0 +1,108 @@
+;; This Source Code Form is subject to the terms of the Mozilla Public
+;; License, v. 2.0. If a copy of the MPL was not distributed with this
+;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
+;;
+;; This Source Code Form is "Incompatible With Secondary Licenses", as
+;; defined by the Mozilla Public License, v. 2.0.
+;;
+;; Copyright (c) 2020 UXBOX Labs SL
+
+(ns uxbox.common.pages-helpers
+  (:require
+   [uxbox.common.data :as d]
+   [uxbox.common.uuid :as uuid]))
+
+(defn get-children
+  "Retrieve all children ids recursively for a given object"
+  [id objects]
+  (let [shapes (get-in objects [id :shapes])]
+    (if shapes
+      (d/concat shapes (mapcat #(get-children % objects) shapes))
+      [])))
+
+(defn is-shape-grouped
+  "Checks if a shape is inside a group"
+  [shape-id objects]
+  (let [contains-shape-fn (fn [{:keys [shapes]}] ((set shapes) shape-id))
+        shapes (remove #(= (:type %) :frame) (vals objects))]
+    (some contains-shape-fn shapes)))
+
+(defn get-parent
+  "Retrieve the id of the parent for the shape-id (if exists)"
+  [shape-id objects]
+  (let [obj (get objects shape-id)]
+    (:parent-id obj)))
+
+(defn get-parents
+  [shape-id objects]
+  (let [{:keys [parent-id] :as obj} (get objects shape-id)]
+    (when parent-id
+      (lazy-seq (cons parent-id (get-parents parent-id objects))))))
+
+(defn generate-child-parent-index
+  [objects]
+  (reduce-kv
+   (fn [index id obj]
+     (assoc index id (:parent-id obj)))
+   {} objects))
+
+(defn calculate-invalid-targets
+  [shape-id objects]
+  (let [result #{shape-id}
+        children (get-in objects [shape-id :shape])
+        reduce-fn (fn [result child-id]
+                    (into result (calculate-invalid-targets child-id objects)))]
+    (reduce reduce-fn result children)))
+
+(defn valid-frame-target
+  [shape-id parent-id objects]
+  (let [shape (get objects shape-id)]
+    (or (not= (:type shape) :frame)
+        (= parent-id uuid/zero))))
+
+(defn insert-at-index
+  [shapes index ids]
+  (let [[before after] (split-at index shapes)
+        p? (set ids)]
+    (d/concat []
+              (remove p? before)
+              ids
+              (remove p? after))))
+
+(defn select-toplevel-shapes
+  ([objects] (select-toplevel-shapes objects nil))
+  ([objects {:keys [include-frames?] :or {include-frames? false}}]
+   (let [lookup #(get objects %)
+         root   (lookup uuid/zero)
+         childs (:shapes root)]
+     (loop [id  (first childs)
+            ids (rest childs)
+            res []]
+       (if (nil? id)
+         res
+         (let [obj (lookup id)
+               typ (:type obj)]
+           (recur (first ids)
+                  (rest ids)
+                  (if (= :frame typ)
+                    (if include-frames?
+                      (d/concat res [obj] (map lookup (:shapes obj)))
+                      (d/concat res (map lookup (:shapes obj))))
+                    (conj res obj)))))))))
+
+(defn select-frames
+  [objects]
+  (let [root   (get objects uuid/zero)
+        loopfn (fn loopfn [ids]
+                 (let [obj (get objects (first ids))]
+                   (cond
+                     (nil? obj)
+                     nil
+
+                     (= :frame (:type obj))
+                     (lazy-seq (cons obj (loopfn (rest ids))))
+
+                     :else
+                     (lazy-seq (loopfn (rest ids))))))]
+    (loopfn (:shapes root))))
+