text: -- wal.test
  -- 
  -- execsql {
  --     PRAGMA journal_mode = WAL;
  --     CREATE TABLE t1(a, b);
  --     INSERT INTO t1 VALUES('a', 'b');
  -- }
  PRAGMA journal_mode = WAL;
  CREATE TABLE t1(a, b);
  INSERT INTO t1 VALUES('a', 'b');