Feature request: update mode

[sunapi386]

It would be useful to periodically run this tool, for example as a cron job, and have a daily/monthly incremental snapshot.

For example, given a folder with the previous fetch info, get me all the newer content.

[sunapi386]

Thanks for the great tool, donated you $5 for a coffee 😄

[zach-snell]

@sunapi386 I appreciate it. I do think that would be possible since everything is time stamped but I think its likely outside the typical use case.

If enough people were interested I could see building it out through, cool idea. I thought of something roughly like this as a work around for message history limit 😜