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← All journal · 2025 · 11 · 18 · Notes

Cost-optimising a £40k/month BigQuery bill

A cloud bill is often a map of organisational habits. Query tuning is only half the job.

Waste accumulates in SQL, but also in ownership gaps, forgotten dashboards, and duplicated semantics.

We reduce spend by making usage visible to the people who create it.

Cost control sticks when the system becomes legible, not when one hero query gets optimised.