Changing a trip's start date positionally re-dates the day rows (keeping their ids), so a dated booking's day_id stayed glued to a now-re-dated day and the booking visually shifted by the offset — until you re-opened and saved it. After a date-range change, non-hotel bookings are now re-anchored to the day matching their absolute reservation_time (the same derivation create/update already use). Bookings whose date falls outside the new range are left untouched; hotels and the relative positional shift of places/notes are unaffected.
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