text: create virtual table posts using fts5(title, content);
  insert into posts values('タイトル1', '本文1');
  insert into posts values('タイトル2', '本文2');
  insert into posts values('たいとる3', 'ほんぶん3');
  insert into posts values('English title 1', 'English content 1.');
  insert into posts values('English title 2', 'English content 2.');
  insert into posts values('english title 3', 'english content 3.');
  
  select * from posts where posts match 'たいとる';
  select * from posts where posts match 'たいとる3';
  
  