Changelog

2026-10-12 — Bench entry, time windows and chronic-vs-blip

Failures can now be logged at the repair bench and kept on the station, and the chart separates problems that keep coming back from one-off spikes. Everything still runs in the browser with no network access.

In this release

• A keyboard-only entry station: one key per failure type, designators checked against the board's placement data, each row saved as it is committed.
• Records kept on the station in the browser, with per-board delete, remove-all, and a portable data bundle to move or back up a station's history.
• Time windows — today, yesterday, each shift, the last 7, 30 or 90 days — counted in the plant's own days and shifts. Date-only records are counted by day and disclosed as not shift-filterable, so totals still reconcile.
• "Work on these": each designator and failure type classed as chronic, stopped, emerging, blip or sporadic from plain counts, with the counts shown beside the label. Thresholds are part of the customer profile.
• A top 5 / 7 / 10 Pareto selector and a component-class filter.
• A customer profile — failure types, entry keys, repair vocabulary, defect codes, shifts and time zone, component classes — so a new manufacturer needs no code change.
• The demo now carries 90 days of synthetic history with a story in it. Privacy policy updated to describe the records kept in the browser.

2026-08-25 — Live at pcb.engsecsolutions.com

The service is live on its own domain, with published security, privacy and data processing terms.

2026-08-24 — First public release

Concentration Chart is available to anyone. This is the first public version; it has been built and tested against synthetic data engineered to mirror a real quality team's inputs, and is now open for use on real boards.

In this release

• Failure counts mapped onto the board image, with per-cause drill-down, failure-type filters, heat overlay, and separate engineering and executive views.
• Placement data read from Altium, KiCad, Eagle and generic exports, including units declared in values or column headings, offset and negative origins, and headerless reports.
• Failure data read from test-system CSVs, pipe-delimited repair logs, quality-system JSON, generic CSVs and Excel workbooks — with delimiters, encodings, dates and column names detected per file.
• Reports scoped by assembly and by period, with each component compared against the preceding window of equal length.
• Export to a self-contained interactive HTML file that opens with no network, or to PNG.
• Board packages saved locally so repeat analysis only needs new failure data.
• Everything runs in the browser under a policy that forbids network access, verified on every deployment in Chromium, Firefox and WebKit. Security model.