fix time and ignore duplciate scans in score keeping

src/models/index.js

@@ -352,10 +352,8 @@ const Scans = {
     const alreadyScanned = this.hasUserScanned(packageId, userId);
 
     if (alreadyScanned) {
-      // No points, but update last_scanned_by so they can edit the hint
+      // No points — don't store 0-point scans, just update last_scanned_by
       db.prepare('UPDATE packages SET last_scanned_by = ? WHERE id = ?').run(userId, packageId);
-      // Record the scan with 0 points
-      db.prepare('INSERT INTO scans (package_id, user_id, points_awarded) VALUES (?, ?, 0)').run(packageId, userId);
       return { points: 0, alreadyScanned: true, isFirst: false };
     }