Chemical visit history

Menu Field work → Chemical history (/operations/chemistry-history).

What it shows

• KPIs: last visit, score band, visits in range, alerts (score < 40).
• Paginated table: pH, FC, TA, CYA, TH, LSI, score, chemical cost (if permitted).
• URL filters: client, pool, date range, page.

API

• GET /api/chemistry-history — tenant-wide paginated list.
• GET /api/pools/:id/chemistry-history — pool history.
• GET /api/pools/:id/chemistry-last — last completed visit (work order banner).

Operational detail is limited to 36 months (hot retention). Wider ranges are clamped with a warning.

Technician work order

Step 1 — Measurements shows a banner with the last visit (Last visit: dd/MM/yyyy HH:mm) and a link to full history. Complements per-parameter “Previous” badges.

Permission

CHEMICAL_CONSULT (Technician, Manager, Admin presets).