diff --git a/src/hyperfiddle/forms0.cljc b/src/hyperfiddle/cqrs0.cljc
similarity index 65%
rename from src/hyperfiddle/forms0.cljc
rename to src/hyperfiddle/cqrs0.cljc
index 3ac5bc719..a6b79c57e 100644
--- a/src/hyperfiddle/forms0.cljc
+++ b/src/hyperfiddle/cqrs0.cljc
@@ -1,6 +1,7 @@
-(ns hyperfiddle.forms0
-  #?(:cljs (:require-macros hyperfiddle.forms0))
-  (:require [contrib.str :refer [pprint-str]]
+(ns hyperfiddle.cqrs0
+  #?(:cljs (:require-macros hyperfiddle.cqrs0))
+  (:require [contrib.data :refer [index-by]]
+            [contrib.str :refer [pprint-str]]
             [hyperfiddle.electric3 :as e]
             [hyperfiddle.electric-dom3 :as dom]
             [hyperfiddle.input-zoo0 :refer [Button!]]))
@@ -47,4 +48,28 @@
 
          (e/When debug
            (dom/pre (dom/props {:style {:min-height "4em"}})
-             (dom/text (pprint-str batch :margin 80)))))))))
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+             (dom/text (pprint-str batch :margin 80)))))))))
+
+(e/defn Reconcile-records [stable-kf sort-key as bs]
+  (e/client
+    (let [as! (e/as-vec as) ; todo differential reconciliation
+          bs! (e/as-vec bs)]
+      (->> (merge
+             (index-by stable-kf as!)
+             (index-by stable-kf bs!))
+        vals
+        (sort-by sort-key)
+        #_(drop (count bs!)) ; todo fix glitch
+        (e/diff-by stable-kf)))))
+
+(e/defn PendingController [kf sort-key edits xs]
+  (let [!pending (atom {}) ; [id -> prediction]
+        ps (val (e/diff-by key (e/watch !pending)))]
+    (e/for [[t xcmd predictions] edits]
+      (assert (= 1 (count predictions)))
+      (let [[id record] (first predictions)]
+        (prn 'pending-cmd xcmd)
+        (swap! !pending assoc id (assoc record ::pending true))
+        (e/on-unmount #(swap! !pending dissoc id))
+        (e/amb)))
+    (Reconcile-records kf sort-key xs ps)))
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