// Users table with auth fields
Table Users {
  // system field
  id text [pk]
  tokenKey text [not null]
  created datetime [default: `now()`]
  updated datetime
  password text [not null]

  // value field
  email text [not null]
  emailVisibility boolean
  verified boolean
  name text
  avatar file
}

// LessonTypes stores different types of lessons
// lesson_types, lesson_type
Table LessonTypes {
  // system field
  id text [pk] // changed from int to text
  created datetime [default: `now()`] // timestamp when the lesson type was created
  updated datetime // timestamp when the lesson type was last updated
  // value field
  name text // changed from varchar to text
  type text // changed from varchar to text
  pos integer
  visible text
  field date
}


// LessonCategories stores categories of lessons
// lesson_categories, lesson_category
Table LessonCategories {
  // system field
  id text [pk] // changed from int to text
  created datetime [default: `now()`] // timestamp when the category was created
  updated datetime // timestamp when the category was last updated
  // value field
  cat_name text // changed from varchar to text
  cat_image_url text // new field
  cat_image file // changed from varchar to file
  pos integer
  lesson_id integer [ref: > LessonTypes.id] // foreign key referencing LessonTypes.id
  description text // new field
  remarks text // changed from varchar to text
  visible text // new field
}

Table Helloworlds {
  // system field
  id text [pk] // changed from int to text
  created datetime [default: `now()`] // record create time
  updated datetime // record update time
  hello text // new field
}

Table UserMetas {
  // system field
  id text [pk] // changed from int to text
  created datetime [default: `now()`]
  updated datetime

  // value field
  helloworld text // changed from varchar to text
  meta json // new field
  user_id text [ref: > Users.id] // changed type and reference
  state text // new field
  avatar file // changed from blob to file
  role text // new field
}

Table QuizCategories {
  // system field
  id text [pk] // changed from int to text
  created datetime [default: `now()`]
  updated datetime

  // value field
  cat_name text // changed from varchar to text
  cat_image text // changed from varchar to text
  init_answer json // new field
}


// stores all questions of matching frenzy
Table QuizMatchings {
  // system field
  id text [pk] // changed from int to text
  created datetime [default: `now()`] // record create time
  updated datetime // record update time

  // value field
  word text // changed from varchar to text
  word_c text // changed from varchar to text
  cat_id text [ref: > QuizCategories.id] // changed type and reference
}

// QuizListening stores all listening quiz data
Table QuizListenings {
  // system field
  id text [pk] // changed from int to text
  created datetime [default: `now()`] // record create time
  updated datetime // record update time

  // value field
  sound file // changed from varchar to file
  word text // changed from varchar to text
  cat_id text [ref: > QuizCategories.id] // changed type and reference
}


// stores all categories of connectives revision quiz
Table QuizConnectivesCategories {
  // system field
  id text [pk] // changed from int to text
  created datetime [default: `now()`] // record create time
  updated datetime // record update time

  // value field
  cat_name text // changed from varchar to text
  cat_image file // changed from varchar to file
}

// stores all questions of connectives revision quiz
Table QuizConnectives {
  // system field
  id text [pk] // changed from int to text
  created datetime [default: `now()`] // record create time
  updated datetime // record update time

  // value field
  question_fh text // changed from varchar to text
  question_sh text // changed from varchar to text
  modal_ans text // changed from varchar to text
  cat_id text [ref: > QuizConnectivesCategories.id] // changed type and reference
}

// Lessons stores all lessons in the database
Table Vocabularies {
  // system field
  id text [pk] // changed from int to text
  created datetime [default: `now()`] // timestamp when the lesson was created
  updated datetime // timestamp when the lesson was last updated

  // value field
  image file // changed from varchar to file
  sound file // changed from varchar to file
  word text // changed from varchar to text
  word_c text // changed from varchar to text
  sample_e text // changed from varchar to text
  sample_c text // changed from varchar to text
  cat_id text [ref: > LessonCategories.id] // changed type and reference
  category text // changed from varchar to text
  lesson_type_id text [ref: > LessonTypes.id] // changed type and reference
}

// Listening Practice Quiz Categories
// store listening practice category, (LpCategories, LpCategory)
Table QuizLPCategories {
  // system fields
  id text [pk]
  created datetime [default: `now()`]
  updated datetime

  // value fields
  cat_name text
  cat_image file
  pos number
  init_answer json
  visible text
  slug text
  remarks text
  description text
}

// Listening Practice Quiz Questions
Table QuizLPQuestions {
  id text [pk] // changed from int to text
  created datetime [default: `now()`]
  updated datetime
  word text // changed from varchar to text
  sound file // changed from blob to file
  cat_id text [ref: > QuizLPCategories.id] // changed type and reference
  cat_name text // new field
  cat_image file // new field
  pos number // new field
  init_answer json // new field
  visible text // new field
  slug text // new field
  remarks text // new field
  description text // new field
}

// Matching Frenzy Quiz Categories
Table QuizMFCategories {
  id text [pk] // changed from int to text
  created datetime [default: `now()`]
  updated datetime
  cat_name text // changed from varchar to text
  cat_image file // changed from blob to file
  pos number // changed from integer to number
  init_answer json
  visible text // new field
}

// Matching Frenzy Quiz Questions
Table QuizMFQuestions {
  id text [pk] // changed from int to text
  created datetime [default: `now()`]
  updated datetime
  word text // changed from varchar to text
  word_c text // changed from varchar to text
  cat_id text [ref: > QuizMFCategories.id] // changed type and reference
  visible text // new field
  sound file // new field
  cat_image file // new field
}

// Connectives Revision Quiz Categories
Table QuizCRCategories {
  id text [pk] // changed from int to text
  created datetime [default: `now()`]
  updated datetime
  cat_name text // changed from varchar to text
  cat_image file // changed from blob to file
  pos integer
  init_answer json
}

// Connectives Revision Quiz Questions
Table QuizCRQuestions {
  id text [pk] // changed from int to text
  created datetime [default: `now()`]
  updated datetime
  question_fh text // changed from varchar to text
  question_sh text // changed from varchar to text
  modal_ans text // changed from varchar to text
  cat_id text [ref: > QuizCRCategories.id] // changed type and reference
  options json // new field
}

// Test table
Table t1 {
  id text [pk] // changed from int to text
  created datetime [default: `now()`]
  updated datetime
  hello text // changed from name to hello
  test_file file // new field
}

// Customers table
Table Customers {
  id text [pk] // new table
  created datetime [default: `now()`]
  updated datetime
  name text
  email text
  phone text
  quota number
  status text
  avatar_file file
  cat_id text [ref: > QuizMFCategories.id] // refer to a single user in `Users` table
}