---
model: gpt-6
service: codex
timestamp: 2026-09-25T19:05:23Z
git_ref: c0dae89a
diff_cmd: git diff HEAD~1..HEAD
---

## Prompt and generated output

The user reported a large MNQ 1s startup bar and asked us to ensure
queued trades are not aggregated into the current timestep when their
timestamps indicate otherwise. After a direct chart restart and a
separate pikerd run showed no spike, the user requested the tested fix
on a separate worktree branch based on `ib_connectivity_harden`, then
requested `$commit-plan`.

> `git diff HEAD~1..HEAD -- piker/data/_sampling.py`

Generated `trade_time_s()` to normalize common epoch units. In
`sample_and_broadcast()`, timestamped trades reach the current 1s bar
only when their rounded time matches the bar. A trade for the next bar
waits briefly for samplerd's step. Older or otherwise mismatched
trades are skipped, with one warning per symbol. Untimestamped trades
retain the existing receive-time behavior.

> `git diff HEAD~1..HEAD -- tests/test_sampling_tick_times.py`

Generated focused tests for epoch units, startup backlog trades,
untimestamped trades, and the next-step wait.

The isolated worktree's focused test run passed: 8 tests. Ruff and
`git diff --check` passed. The user also live-tested the same guard
on direct chart and separate pikerd starts without seeing the spike.