const String createItemCategoryTable = '''
CREATE TABLE item_category (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  name TEXT NOT NULL,
  description TEXT,
  created_at TEXT DEFAULT (datetime('now')),
  updated_at TEXT DEFAULT (datetime('now'))
);
''';

const String insertDefaultCategory = '''
INSERT INTO item_category (name, description) VALUES ('默认分类', '系统默认分类');
''';