diff --git a/kfet/static/kfet/js/history.js b/kfet/static/kfet/js/history.js
index 33e9a318..ecf86878 100644
--- a/kfet/static/kfet/js/history.js
+++ b/kfet/static/kfet/js/history.js
@@ -138,6 +138,30 @@ class History {
         return true;
     }
 
+    is_valid(opegroup) {
+        var options = this.api_options;
+
+        if (options.from && dateUTCToParis(opegroup.content.at).isBefore(moment(options.from)))
+            return false;
+
+        if (options.to && dateUTCToParis(opegroup.content.at).isAfter(moment(options.to)))
+            return false;
+
+        if (options.transfersonly && opegroup.type === 'opegroup')
+            return false;
+
+        if (options.accounts && options.accounts.length &&
+                options.accounts.indexOf(opegroup.content.account_id) < 0)
+            return false;
+
+        if (options.checkouts && options.checkouts.length && 
+                (opegroup.type === 'transfergroup' || 
+                 options.checkouts.indexOf(opegroup.content.checkout_id) < 0))
+            return false;
+            
+        return true;
+    }
+
     update_data(data) {
         //Filter opegroups before ?
         var opegroups = data['opegroups'];
@@ -164,10 +188,7 @@ class History {
                 this.update_node('opegroup', opegroup.id, update_data);
             }
 
-            if (opegroup['add']) {
-                if (opegroup.type === 'opegroup' && this.api_options.transfersonly)
-                    return;
-
+            if (opegroup['add'] && this.is_valid(opegroup)) {
                 this.add_node(opegroup);            
             }
         }
diff --git a/kfet/templates/kfet/account_read.html b/kfet/templates/kfet/account_read.html
index 7618375c..7f3c951f 100644
--- a/kfet/templates/kfet/account_read.html
+++ b/kfet/templates/kfet/account_read.html
@@ -78,7 +78,20 @@ $(document).ready(function() {
         'accounts': [{{ account.pk }}],
     };
 
-    //TODO: add ws support ?
+    // -----
+    // Synchronization
+    // -----
+
+    var websocket_msg_default = {'opegroups':[],'opes':[]}
+
+    var websocket_protocol = window.location.protocol == 'https:' ? 'wss' : 'ws';
+    var location_host = window.location.host;
+    var location_url = window.location.pathname.startsWith('/gestion/') ? location_host + '/gestion' : location_host;
+    var socket = new ReconnectingWebSocket(websocket_protocol+"://" + location_url + "/ws/k-fet/k-psul/");
+    socket.onmessage = function(e) {
+        var data = $.extend({}, websocket_msg_default, JSON.parse(e.data));
+        history.update_data(data);
+    }
 
     history.reset();
 });
diff --git a/kfet/templates/kfet/history.html b/kfet/templates/kfet/history.html
index 0b6841ae..34d2ac15 100644
--- a/kfet/templates/kfet/history.html
+++ b/kfet/templates/kfet/history.html
@@ -115,7 +115,7 @@ $(document).ready(function() {
         timeZone  : 'Europe/Paris',
         format    : 'YYYY-MM-DD HH:mm',
         stepping  : 5,
-        defaultDate: moment(),
+        defaultDate: moment().add(5, 'minutes'), // workaround for 'stepping' rounding
         locale    : 'fr',
         showTodayButton: true,
     });
diff --git a/kfet/views.py b/kfet/views.py
index 27de08f8..0354d655 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -1060,8 +1060,11 @@ def kpsul_perform_operations(request):
             'is_cof': operationgroup.is_cof,
             'comment': operationgroup.comment,
             'valid_by': (operationgroup.valid_by and
-                operationgroup.valid_by.trigramme or None),
+                         operationgroup.valid_by.trigramme or None),
             'trigramme': operationgroup.on_acc.trigramme,
+            # Used to filter websocket updates
+            'account_id': operationgroup.on_acc.pk,
+            'checkout_id': operationgroup.checkout.pk,
         },
         'parent': {
             'type': 'day',