scripts/export-legacy-refs.js: which med_ object stands behind each legacy reference under a prefix (read-only), for services moving to object ids (C-24, Community's screenshot pastes)

ddiff --git a/scripts/export-legacy-refs.js b/scripts/export-legacy-refs.js
nnew file mode 100644
iindex 0000000..34454f8
---- /dev/null
++++ b/scripts/export-legacy-refs.js
@@@ -0,0 +1,29 @@
++#!/usr/bin/env node
++'use strict';
++/**
++ * Export which media object (med_…) stands behind each legacy reference, for services that still store
++ * `legacy:<app>:<kind>:<id>` refs and move to object ids (C-24: OpenVibe.Community's screenshot pastes,
++ * scripts/migrate-screenshot-refs.js there).
++ *
++ *   node scripts/export-legacy-refs.js --prefix legacy:live:paste: --out /tmp/refs.json [--db ./data/media.db]
++ *
++ * Read-only (opens the database readonly). Output: { generated_at, prefix, count, objects: [{ legacy_ref, id,
++ * kind, lifecycle_status }] } ordered by legacy_ref. Deleted objects are included with their status, so the
++ * consumer can tell "gone" from "never existed".
++ */
++const fs = require('fs');
++const path = require('path');
++const Database = require('better-sqlite3');
++
++const args = process.argv.slice(2);
++const arg = (name, dflt) => { const i = args.indexOf(`--${name}`); return i >= 0 ? args[i + 1] : dflt; };
++const prefix = arg('prefix');
++const out = arg('out');
++const dbPath = path.resolve(arg('db', process.env.DB_PATH || './data/media.db'));
++if (!prefix || !/^legacy:[a-z0-9_-]+:/.test(prefix) || !out) { console.error('usage: export-legacy-refs.js --prefix legacy:<app>:<kind>: --out <file> [--db path]'); process.exit(2); }
++
++const db = new Database(dbPath, { readonly: true, fileMustExist: true });
++const objects = db.prepare(`SELECT legacy_ref, id, kind, lifecycle_status FROM media_objects
++                            WHERE legacy_ref >= ? AND legacy_ref < ? ORDER BY legacy_ref`).all(prefix, `${prefix}￿`);
++fs.writeFileSync(out, JSON.stringify({ generated_at: new Date().toISOString(), prefix, count: objects.length, objects }, null, 1));
++console.log(`[export-legacy-refs] ${objects.length} object(s) under ${prefix} → ${out}`);