---
model: claude-fable-5[1m]
service: claude
timestamp: 2026-06-10T17:12:59Z
git_ref: datad_service
diff_cmd: git log -1 -p --follow -- ai/prompt-io/claude/20260610T171259Z_59d5d9a6_prompt_io.md
---

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

> `git log -1 -p --follow -- piker/data/feed.py`

Generated: `open_feed()` spawn cutover with the
`maybe_spawn_datad` import done "relative-direct" from
`._daemon` — NOT via `piker.service` — to dodge a
partial-init cycle: when `piker.data.feed` loads as
part of `piker.service.__init__` executing its own
`piker.data._daemon` import, the service pkg is
mid-init and its `maybe_spawn_datad` binding does not
exist yet. The `open_feed_bus()` local-state sanity
assert flips `'brokerd' in servicename` ->
`'datad' in servicename` (the only actor-name assert
in the tree, verified by grep).

> `git log -1 -p --follow -- piker/brokers/_daemon.py`

Generated: `_setup_persistent_brokerd()` slimmed to
console-log setup + pinned-open ctx; drops the bus
alloc, the `assert not feed._bus`, the service nursery
(backend `open_trade_dialog()` ctxs own their task
trees) and the `eg.ExceptionGroup` handler. The
`piker ledger` ad-hoc actor enters this same slimmed
fixture — exactly what it needs.

> `git log -1 -p --follow -- piker/ui/_app.py`
> `git log -1 -p --follow -- piker/ui/cli.py`
> `git log -1 -p --follow -- piker/brokers/core.py`
> `git log -1 -p --follow -- piker/brokers/cli.py`
> `git log -1 -p --follow -- piker/ui/kivy/option_chain.py`
> `git log -1 -p --follow -- tests/test_services.py`

Verification (from session): per-suite gates green at
this commit (services 5-passed incl. the new negative
assert, feeds 3-passed); a headless live smoke
(`maybe_open_pikerd` + `open_feed(['xbtusdt.kraken'])`
on an alt registry port) confirmed quotes flowing via
`datad.kraken` + `samplerd` with `check_for_service(
'brokerd.kraken') is None`. Known pre-existing flake
documented: `test_multi_fill_positions`' second
in-proc runtime boot wedges ~50% (zombie subactor w/
unread parent-IPC bytes); reproduced with the split
fully reverted so NOT a regression of this work.