Import: read Live's chat_messages time from its timestamp column (created_at on older snapshots); the fixture now mirrors Live's schema — the production dry run failed on it

ddiff --git a/server/importer/live.js b/server/importer/live.js
iindex e37e646..74fa04f 100644
---- a/server/importer/live.js
++++ b/server/importer/live.js
@@@ -92,8 +92,10 @@ async function importLive(domain, { live, billingSource = null, resolveLiveUsers
      // ── Read the snapshot ────────────────────────────────────
      const txns = tableExists(live, 'transactions') ? live.prepare("SELECT * FROM transactions WHERE type IN ('donation', 'refund') ORDER BY id").all() : [];
      const chatCols = columns(live, 'chat_messages');
++    // Live's chat_messages carries its time in `timestamp` (older snapshots: created_at).
++    const chatTs = chatCols.includes('created_at') ? 'created_at' : (chatCols.includes('timestamp') ? 'timestamp' : 'NULL');
      const chatDonations = chatCols.includes('metadata')
--        ? live.prepare("SELECT id, channel_user_id, username, message, metadata, created_at FROM chat_messages WHERE message_type = 'donation' AND metadata LIKE '%powerchat%' ORDER BY id").all()
++        ? live.prepare(`SELECT id, channel_user_id, username, message, metadata, ${chatTs} AS created_at FROM chat_messages WHERE message_type = 'donation' AND metadata LIKE '%powerchat%' ORDER BY id`).all()
          : [];
      const goalRows = tableExists(live, 'donation_goals') ? live.prepare('SELECT * FROM donation_goals ORDER BY id').all() : [];
      const users = new Map((tableExists(live, 'users') ? live.prepare('SELECT id, username, display_name FROM users').all() : []).map((u) => [String(u.id), u]));
ddiff --git a/test/import.test.js b/test/import.test.js
iindex b7edd84..77aa464 100644
---- a/test/import.test.js
++++ b/test/import.test.js
@@@ -13,7 +13,7 @@ function liveFixture(file) {
          CREATE TABLE transactions (id INTEGER PRIMARY KEY, from_user_id INTEGER, to_user_id INTEGER, stream_id INTEGER, amount INTEGER NOT NULL,
              type TEXT NOT NULL, status TEXT DEFAULT 'completed', message TEXT, paypal_transaction_id TEXT, created_at DATETIME DEFAULT CURRENT_TIMESTAMP);
          CREATE TABLE chat_messages (id INTEGER PRIMARY KEY, stream_id INTEGER, channel_user_id INTEGER, user_id INTEGER, username TEXT, message TEXT,
--            message_type TEXT DEFAULT 'chat', metadata TEXT, created_at DATETIME DEFAULT CURRENT_TIMESTAMP);
++            message_type TEXT DEFAULT 'chat', metadata TEXT, timestamp DATETIME DEFAULT CURRENT_TIMESTAMP);   -- Live's column name
          CREATE TABLE donation_goals (id INTEGER PRIMARY KEY, user_id INTEGER, title TEXT, target_amount INTEGER, current_amount INTEGER DEFAULT 0,
              is_active INTEGER DEFAULT 1, image_url TEXT, media_type TEXT, reached_at DATETIME, sort_order INTEGER DEFAULT 0, created_at DATETIME DEFAULT CURRENT_TIMESTAMP);
          CREATE TABLE site_settings (key TEXT PRIMARY KEY, value TEXT);
@@@ -31,7 +31,7 @@ function liveFixture(file) {
      t.run(7, 1, 2, null, 250, 'refund', 'completed', 'Refund: Song', '2026-02-04 10:00:00');
      t.run(8, null, 5, null, 1000, 'donation', 'completed', 'PowerChat tip via site account ($10.00)', '2026-02-05 12:00:00');
      t.run(9, null, 2, null, 1000, 'purchase', 'completed', null, '2026-01-20 12:00:00');
--    const c = db.prepare("INSERT INTO chat_messages (id, channel_user_id, username, message, message_type, metadata, created_at) VALUES (?, ?, ?, ?, 'donation', ?, ?)");
++    const c = db.prepare("INSERT INTO chat_messages (id, channel_user_id, username, message, message_type, metadata, timestamp) VALUES (?, ?, ?, ?, 'donation', ?, ?)");
      c.run(1, 5, 'Fan', 'Fan tipped 1000 Vibes (PowerChat)', JSON.stringify({ kind: 'donation', amount: 1000, message: '', username: 'Fan', source: 'powerchat' }), '2026-02-05 12:00:30');
      c.run(2, 1, 'Direct', 'Direct tipped 700 Vibes (PowerChat)', JSON.stringify({ kind: 'donation', amount: 700, message: 'love it', username: 'Direct', source: 'powerchat' }), '2026-02-06 09:00:00');
      c.run(3, 1, 'Viewer', 'Viewer donated 500 Vibes: nice', JSON.stringify({ kind: 'donation', amount: 500, username: 'Viewer' }), '2026-02-01 10:00:01');