-- Flyway V2: Ensure weather_data upsert works by providing a unique index
-- Some rows may have been inserted without a uniqueness constraint; de-duplicate first,
-- keeping the most recently created record per (property_id, date)

-- Remove duplicates (keep latest created_at, then highest id)
WITH ranked AS (
  SELECT ctid, ROW_NUMBER() OVER (
           PARTITION BY property_id, date
           ORDER BY created_at DESC, id DESC
         ) AS rn
  FROM weather_data
), to_delete AS (
  SELECT ctid FROM ranked WHERE rn > 1
)
DELETE FROM weather_data w
USING to_delete d
WHERE w.ctid = d.ctid;

-- Now add the uniqueness guarantee
CREATE UNIQUE INDEX IF NOT EXISTS ux_weather_data_property_date
  ON weather_data(property_id, date);
