We turned every 'how to run SQE for X' into a self-contained run.sh that goes from clean state to captured output. The point was documentation. The payoff was a test suite that caught a missing metric, an overclaimed capability, and a benchmark that would have polluted our baselines.
ReadSQE already tracked every query and worker in memory, but there was no way to look at it without tailing logs or wiring Grafana. So we put a read-only dashboard on the health port: no login, no build step, no external assets. One HTML page over a small JSON API, with a tiny in-memory sampler so the charts move over time. Here is how it is built and why it stays deliberately small.
ReadSQE now emits OL 2-0-2 events with column-level lineage on every write. Here is what they look like, why we walked the LogicalPlan to build them, and the disk spool we did not want to write.
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