-- backfill_002_house_sources.sql
-- Purpose: Populate house_sources from legacy houses.(source, ext_house_id) pairs.
-- Idempotent -- ON CONFLICT DO NOTHING.
-- Run AFTER backfill_001 (fingerprint backfill is independent but logically prior).
--
-- Column notes (verified against 009_houses.sql + 029_extend_matching_valuation_dynamics.sql):
--   houses.last_scraped_at  -- timestamptz, NOT NULL DEFAULT NOW() (009_houses.sql)
--   house_sources.last_seen_at -- added in 029 (nullable timestamptz)
--   house_sources columns: id, house_id, ext_source, ext_id, confidence, matched_method,
--                          matched_at, ext_url, raw_payload, last_seen_at
--
-- Usage:
--   psql "$DATABASE_URL" -f tradein-mvp/scripts/backfill_002_house_sources.sql

BEGIN;

INSERT INTO house_sources (
    house_id,
    ext_source,
    ext_id,
    confidence,
    matched_method,
    matched_at,
    last_seen_at
)
SELECT
    h.id,
    h.source,
    h.ext_house_id,
    1.0           AS confidence,
    'backfill'    AS matched_method,
    NOW()         AS matched_at,
    h.last_scraped_at AS last_seen_at
FROM houses h
WHERE h.ext_house_id IS NOT NULL
ON CONFLICT (ext_source, ext_id) DO NOTHING;

\echo 'house_sources backfill complete'
SELECT count(*) AS total_house_sources FROM house_sources;
SELECT ext_source, count(*) AS rows FROM house_sources GROUP BY ext_source ORDER BY ext_source;

COMMIT;