First-observed customers per cohort

Store

Customers whose FIRST purchase observed in the available history falls in the cohort month. Not proof they are new: each cohort states how many months of history precede it and whether that history is continuous, proven day by day.

Formula
count(customer: min(placed_at) ∈ month)
Where the AI finds it
get_cohorts → cohorts.*.first_observed_customers
How it is verified

Calculation checked against hand-computed values · MT-33 · CohortService::cohorts

Ask it like this
For [store], show first-observed customers per cohort for the cohorts of the last 12 months (get_cohorts).

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