Problem: Hivemind discord no separation between day and channel summaries from threads

[amindadgar]

In the case of people sending messages in the channel itself, we're assuming the thread to be None. In another case of doing channel summaries, we're saving None values for thread. In these cases, there's no separation between the channel summaries and no-thread messages summary.

[amindadgar]

The solution to this can be removing the thread from the document metadata when creating the channel summaries.