The backstop behind the EOD-flatten fix: even with the EOD flatten working, a
carry can survive (loop down at EOD, or the held-qty 403 before it was fixed) and
bleed for days — ATPC sat 4 days over the Juneteenth gap, -$651. This closes any
position carried from a PRIOR session, at the open, before it bleeds.
- runtime/flatten.find_overnight_carries (pure, tested): open positions with no
BUY filled today (ET) = carried overnight. Today's fresh names have a buy
today, so they're never touched.
- ExecutionService.flatten_overnight_carries: detects carries from the broker
(positions + filled buys) and closes them via the robust cancel-legs-then-close
path — WITHOUT halting the session (unlike close_session), so today's trading
continues. Emits an open_catchup_flatten risk event.
- run_live_paper step_open_catchup_flatten: once per session, during RTH, gated by
TRADING_OPEN_CATCHUP_FLATTEN_ENABLED (def 1). Loud log when it flattens a carry.
Dry-run against the live book: correctly targets ONLY ATPC (6/18 carry), leaves
today's DAMD/ECX. 38 runtime/safety tests pass. Needs a loop restart to activate.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
