List of "sessions" contains a set of timeframes (whithing the day) which will be used to bound historical and real-time 'bars' that the chart will operate with. For example session [9:30AM ; 4:00PM] will limit all chart data to be bound to this timeframe only.
Note 1. User can use several session records at once. In this case the data will be a result of their union.
Note 2. Meaning of using sessions results only in bounding (filtering) data that will be used in a chart. This will not limit data that are downloading from datafeed server.
