DB: fix access to master buffers during DP insertion #30
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Access to master buffers during datapoint insertion sometimes results in
KeyErrorcausing termination of worker thread. Eventually, error "Thread X is dead, more than 20 restarts attempted, giving up..." appears, worker termination procedure gets invoked, but ends up with infinite logging of "N worker threads alive". The result is silent failure of the whole worker and no task processing. This situation needs further investigation, but I'm at least providing a fix.