Time-dependent audience membership

temporal

Audience membership defined by location visitation is inherently time-bound (a person who visited last month may not still be a customer); treating an audience segment as static after its build date silently stales the targeting/measurement population.

Detection

Segment build/refresh timestamp older than the segment's documented validity window relative to current campaign flight dates.

Mitigation

Attach a build timestamp and validity window to every audience segment and enforce refresh before expiry
Re-materialize location-based audiences on a fixed cadence rather than reuse a single static build across a long flight

Affected conversions

Point → H3 exact
Point+radius → H3 approximate