+/- table definition

Query 

CREATE TABLE textbook_texts  (
  id          INTEGER PRIMARY KEY AUTOINCREMENT,
  lesson_id   INTEGER NOT NULL REFERENCES textbook_lessons(id),
  content     TEXT NOT NULL,
  -- 课文全文
    paragraphs  TEXT,
  -- JSON: 分段后的段落数组
    word_count  INTEGER,
  -- 字数
    created_at  DATETIME DEFAULT (datetime('now'))
)
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