-- Meta: clics en el enlace (Ads Manager) aparte de clicks = clics todos.
ALTER TABLE public.ad_daily
  ADD COLUMN IF NOT EXISTS link_clicks numeric(14, 6) NOT NULL DEFAULT 0;

-- Backfill from legacy Meta marker stored in ad_name (`__lc:N`).
UPDATE public.ad_daily
SET link_clicks = (regexp_match(ad_name, '^__lc:([0-9.]+)$'))[1]::numeric
WHERE platform = 'meta'
  AND ad_name ~ '^__lc:'
  AND (link_clicks IS NULL OR link_clicks = 0);

-- Google: link clicks ≈ all clicks at campaign level.
UPDATE public.ad_daily
SET link_clicks = clicks
WHERE platform = 'google'
  AND (link_clicks IS NULL OR link_clicks = 0)
  AND clicks IS NOT NULL
  AND clicks > 0;