houses: one row per listing when a hand-added link is scraped later

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-rekey.ts

@@ -0,0 +1,41 @@
+// One-off/backfill: give manual house.listings rows with a Funda, Pararius, Kamernet or
+// Vesteda link that site's (source, source_id), so a later scrape updates them instead
+// of adding copies. Rows whose key another row already has are reported, not changed.
+//
+//   DB_URL=... bun scripts/house-rekey.ts [--dry-run]
+//   scripts/house-db.sh is for house-listing.ts; run this with a role that may update listings.
+import postgres from 'postgres';
+import { siteKeyFromUrl } from '../src/lib/house-tracker/link-key';
+
+const dryRun = process.argv.includes('--dry-run');
+const dbUrl = process.env.DB_URL ?? process.env.DATABASE_URL;
+if (!dbUrl) throw new Error('DB_URL is not set');
+const sql = postgres(dbUrl, { max: 1, onnotice: () => {} });
+
+try {
+	await sql.begin(async (tx) => {
+		const rows = await tx<{ id: number; source_id: string; url: string }[]>`
+			SELECT id, source_id, url FROM house.listings WHERE source = 'manual' ORDER BY id FOR UPDATE`;
+		const claimed = new Set<string>();
+		for (const row of rows) {
+			const key = siteKeyFromUrl(row.url);
+			if (!key) continue;
+			const pair = `${key.source}/${key.sourceId}`;
+			const [owner] = await tx<{ id: number }[]>`SELECT id FROM house.listings
+				WHERE source = ${key.source} AND source_id = ${key.sourceId}`;
+			if (owner || claimed.has(pair)) {
+				console.log(
+					`#${row.id} conflict: ${pair} is already #${owner?.id ?? '(another manual row)'}, kept manual`
+				);
+				continue;
+			}
+			claimed.add(pair);
+			console.log(`#${row.id} ${row.source_id} -> ${pair}${dryRun ? ' (dry run)' : ''}`);
+			if (!dryRun)
+				await tx`UPDATE house.listings SET source = ${key.source}, source_id = ${key.sourceId}
+					WHERE id = ${row.id}`;
+		}
+	});
+} finally {
+	await sql.end();
+}