Optional ReadonlybreaksOptional intraday breaks, each [start, end) within [open, close], sorted and non-overlapping.
ReadonlycloseSession close, epoch-ms, exclusive. Always > open.
ReadonlydateTrading date as a tz-naive ISO date YYYY-MM-DD — the session's identity and label.
ReadonlyopenSession open, epoch-ms, inclusive.
One trading day.
[open, close)is half-open (the open instant trades, the close instant does not), matching pond's bucket convention.