Last intraday bar @ 16:00:00
Author: kazuna
Creation Date: 2/27/2018 5:04 PM
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On 02/26/2018, symbol "OIL" didn't have any trades after 15:55:00. therefore the streaming chart didn't execute until market close. However, at 16:00:02, it was right after the market close, new streaming bar arrived and the streaming chart was executed.

Is this expected if there is no trade at the last bar (15:59:00)?

What's the point of executing the intraday chart after the market close?
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I think this is the heartbeat method of the streaming data provider (here Fidelity). For streaming charts without a tick update for some time, it lets them update.