@rlightner my suggestion is to allow the user to change the END DATE of the brew (when done) then simply delete all readings AFTER that date. You could avoid having to create some bulk delete interface. Ideally just a quick prompt like "Would you like to delete any readings outside the brew dates?"
I think this is a great idea!
Some Tile Pi Feedback:
Use the HDMI version of the firmware even if you are not attaching a monitor to the Pi and interact with it as web server.
Besure to visit the system menu page and do a "UPDATE APP(FLOW)" if the version number is not 2.1 or greater.
On the logging page: