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Option to disable "Conflict Detection" for individual calendars
Proposed
Since I'm having quite some dates without a distinct start time on a regular basis, it's most annoying to have a pop-up asking me to ignore conflicts every time I set up such an entry.
Especially if this happens with repeated dates and your database has to be checked decades into the future, which takes a long time.
So you could spare me a lot of pop-up and spare your computers a lot of unnecessary calculations with such an option.
I like this idea 
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