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ToMillisecondUnixTime[] truncates milliseconds when it converts DateObject[]'s to milliseconds from epoch. As a result, you can't perform sub-second date/time queries. That prevents efficiently finding records in the case where you might be looking for records in a 20ms window where you have records stored at 100 Hz. As a result of the truncation, you'd have to retrieve all ~100 records and find the subset within the window.

Need a fix along the lines in ACommon.m:

ToMillisecondUnixTime[date_DateObject] := Module[
	{sec,msec},
	msec = date["Millisecond"];
	If[MissingQ[msec], msec = 0, msec *= 10];
	sec = date["Second"];
	If[MissingQ[sec], sec = 0];
	1000 * UnixTime[date] + msec
]

Additionally, it appears that on my Mac OS system, that DateObject[...]["Millisecond"] reports hundredths of seconds instead of milliseconds. I do not know how widespread that is and how one would detect it (maybe that's why this it's truncated?).

ReadME.me suggests to go to GH releases page in order to install the paclet. Yet the list is empty.

Is is possible to use mongodb Atlas with wolfram cloud?

I would like to request support for changes streams:

https://www.mongodb.com/docs/manual/changeStreams/

If available, it could be used in a HandlerFunction for asynchronous functions such as SessionSubmit.