piker/ai/prompt-io/claude/20260610T213549Z_f084e899_prompt_io.raw.md

NOTE: diff-ref mode entry (code committed in the same commit as this log); recorded from the live debug session per the /prompt-io skill rules.

git log -1 -p --follow -- piker/brokers/ib/broker.py git log -1 -p --follow -- piker/brokers/ib/api.py

Key diagnostic chain (from session):

• pdb showed Client._contracts == {} inside brokerd.ib‘s submit_limit(); the cache has exactly TWO write sites: Client.find_contracts() (api.py, keys f'{sym}.{exch}.ib') and symbols.get_mkt_info() (key mkt.bs_fqme, eg. ’nvda.nasdaq’ — NO .ib suffix).
• BrokerdOrder.symbol arrives as the bs_fqme form (‘nvda.nasdaq’) so ONLY the get_mkt_info() write site produces the key submit_limit() reads — ie. pre-split it was the feed’s in-proc get_mkt_info(sym, proxy=proxy) call keeping orders working, NOT find_contracts().
• the existing TODO at symbols.py:642-644 literally predicted this: “this is going to be problematic if/when we split out the datad vs. brokerd actors since the mktmap lookup table will now be inaccessible..”
• instance identity verified: proxy._aio_ns IS the same Client obj as _accounts2clients[account] (both sourced from the load_aio_clients() cache via open_client_proxies()), so a brokerd-side get_mkt_info(fqme, proxy=proxies[account]) warms exactly the dict submit_limit() reads. It also populates client._cons2mkts which the position-audit path (broker.py backup-table code) needs in this actor anyway.
• the TrioTaskExited storm in the user’s log (recv_trade_updates, open_aio_client_method_relay aio tasks) is teardown cascade: the raise crashed handle_order_requests -> nursery teardown ripped the trio sides of still-running aio relay tasks. Hence the added per-order try/except -> BrokerdError relay hardening so a single bad submission degrades to an EMS error msg instead of killing the backend’s entire order-ctl dialog.

Verification: tests/test_services.py (5 passed) + tests/test_ems.py (6 passed) regression-green; live ib submission retest delegated to the human (needs a running TWS/gw).