The nightly scraper and worker API now take over an existing row (e.g. source=manual)
whose link is the same listing (normalized URL, or the Pararius key / Funda, Kamernet,
Vesteda id in it) instead of inserting a copy; typed values are kept where the scrape has
none. house-listing update/add give manual rows with such links the site key unless
another row has it, update accepts --source/--source-id, and lookups by link ignore
tracking params. scripts/house-rekey.ts backfills existing manual rows.
scripts/house-listing.ts (bun run house add|update|list|remove|restore) upserts
house.listings on (source, source_id) derived from the listing URL or address,
derives city_slug, records price_history, and accepts flags or JSON.
