no flicker, no trades shown on the chart

_dev/notes.md

@@ -18,8 +18,7 @@ we stopped showing executed trades on the chart. let's add them back
 update chart every second as well.
 the list with closed trades is not updated. clear session button does not clear all data.
 
-add buttons for quick manual buy/sell (max 1 lot. sell closes long, buy closes short if already open position exists)
-
+fix the dash. it still flickers every 10 seconds for a second. update the chart every second. maintain zoom and position of the chart if possible. set default chart to 15 minutes, but allow zoom out to the current 5 hours (keep the data cached)