-- CRM date correctness: preserve lead birth vs status change timing.
-- Run in Supabase SQL editor (service role / dashboard).

alter table public.leads
  add column if not exists updated_at timestamptz;

alter table public.leads
  add column if not exists status_changed_at timestamptz;

comment on column public.leads.created_at is
  'When the contact entered Clientify / first seen (alta).';
comment on column public.leads.updated_at is
  'Last webhook/sync touch.';
comment on column public.leads.status_changed_at is
  'When status last changed (e.g. → cliente). Use this for “ventas en el periodo”.';

-- Backfill: unknown status timing → treat as created_at (best effort).
update public.leads
set
  updated_at = coalesce(updated_at, created_at, now()),
  status_changed_at = coalesce(status_changed_at, created_at, now())
where updated_at is null or status_changed_at is null;