get_deregistered_stats

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Get the De-registered overview The participants that left the network. A De-registered ID is a participant that is not registered now AND has at least one closed registration row. An ID that was never observed registered (not scanned yet, or never in the SML) is not de-registered: it is counted apart in `never_registered` and is in no other number here. `leavers` is the sub-count of the De-registered IDs that left while a Provider served them. `deregistered`, `share_pct` and `countries` are the stock of the daily rollup (`as_of`). `flow` and `weekly` are the leave flow from the network growth series of `/v1/network/stats`, to the last complete UTC day: `flow.d7` and `flow.d30` are the same counts as `leavers.last_7d` and `leavers.last_30d` there. A day with no completed change scan is a gap: its de-registrations are counted on the next scanned day, so a period sums all its days and `gap_days` only marks it. A period or a week of gap days only has `leavers: null` — a gap is never 0. Joiners do not depend on the change scan, so a gap day keeps them. `annualized_leave_rate_pct` is the Leaver rate (annualized), the same figure as `leavers.annualized_pct` of `/v1/network/stats`: the 30-day leavers as a percentage of the registered participants at the start of the period, × 365 / the days of the period. Leave dates are reliable from 2026-08-02 (`reliable_from`); a period that would open earlier is clamped to it, and the weekly trend starts there. The event date of a de-registration is about 3 days after the true leave (3 consecutive scans without the ID). Free. The company breakdown of the same population is `/v1/stats/deregistered/companies` (Market).