Update last_crawled timestamp when skipping duplicate content and improve error handling

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Co-Authored-By: Claude <noreply@anthropic.com>

db/db.go

@@ -448,7 +448,7 @@ func (d *DbServiceImpl) GetLatestSnapshot(ctx context.Context, tx *sqlx.Tx, url
 		if errors.Is(err, sql.ErrNoRows) {
 			return nil, nil
 		}
-		return nil, xerrors.NewError(fmt.Errorf("cannot get latest snapshot for URL %s: %w", url, err), 0, "", false)
+		return nil, xerrors.NewError(fmt.Errorf("cannot get latest snapshot for URL %s: %w", url, err), 0, "", true)
 	}
 	return s, nil
 }