When we've got missing bar data because eitehr it wasn't available when we synced originally, or because we were on something like M5 and we only downloaded 300 bars of, say 10,000 bars, we need to do two things:
Show the missing bars as a space (if newest bars as well - not just missing in past) - also for volume
Side bar on selected bar data says "Missing Bar"
Reload that data if possible (no more than 500 per request though)
Backfill missing signals further back than most recent in stack but don't try too often
When we've got missing bar data because eitehr it wasn't available when we synced originally, or because we were on something like M5 and we only downloaded 300 bars of, say 10,000 bars, we need to do two things: