drupflare/worker - v1.0.4
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    Variable SWEEP_ROWS_FRACTIONConst

    SWEEP_ROWS_FRACTION: 0.25 = DEFAULT_AUTH_ROWS_FRACTION

    What share of the day's rows a sweep may spend: the default 25% split, which leaves demand fills 5.5x the need at 3,000,000 visits a month (free-envelope.ts; the spec recomputes it).