CalendarEvents range-scanned the key prefix and returned every historical
row, voided ones included. The facts table is append-only and the event
key is day plus summary, so moving a standup from 14:00 to 16:00 left two
rows under one key. The day plan prints a time per line, so it recited
both and told the owner he had two standups.
The query now drops voided rows, keeps the latest row within a source,
and prefers the best-evidenced source across them, so a notification
relay guessing at a meeting cannot displace the calendar read of it.
Found in review of #58.
kami
38b09ded95