database:
  type: "sqlite"
  version: "3"
  tables:
    - name: "users"
      columns:
        - name: "id"
          type: "TEXT"
          primaryKey: true
        - name: "name"
          type: "TEXT"
          nullable: false
          constraints: "CHECK(length(name) >= 2 AND length(name) <= 20)"
        - name: "phone"
          type: "TEXT"
          nullable: false
          unique: true
          constraints: "CHECK(length(phone) = 11 AND phone LIKE '1%' AND substr(phone, 2, 1) BETWEEN '3' AND '9')"
        - name: "password"
          type: "TEXT"
          comment: "用户登录密码 (当前版本为明文存储)"
        - name: "created_at"
          type: "DATETIME"
          default: "CURRENT_TIMESTAMP"
      indexes:
        - name: "idx_users_phone"
          columns: ["phone"]
        - name: "idx_users_created_at"
          columns: ["created_at"]

    - name: "user_groups"
      columns:
        - name: "id"
          type: "TEXT"
          primaryKey: true
        - name: "name"
          type: "TEXT"
          nullable: false
          unique: true
        - name: "description"
          type: "TEXT"
        - name: "is_system"
          type: "INTEGER"
          default: "0"
          comment: "是否为系统内置组 (0:否, 1:是)"
        - name: "created_at"
          type: "DATETIME"
          default: "CURRENT_TIMESTAMP"
      indexes:
        - name: "idx_user_groups_name"
          columns: ["name"]

    - name: "user_group_members"
      columns:
        - name: "group_id"
          type: "TEXT"
          nullable: false
          foreignKey:
            table: "user_groups"
            column: "id"
        - name: "user_id"
          type: "TEXT"
          nullable: false
          foreignKey:
            table: "users"
            column: "id"
        - name: "created_at"
          type: "DATETIME"
          default: "CURRENT_TIMESTAMP"
      indexes:
        - name: "idx_user_group_members_unique"
          columns: ["group_id", "user_id"]
          unique: true

    - name: "question_categories"
      columns:
        - name: "id"
          type: "TEXT"
          primaryKey: true
        - name: "name"
          type: "TEXT"
          nullable: false
          unique: true
        - name: "created_at"
          type: "DATETIME"
          default: "CURRENT_TIMESTAMP"
      indexes:
        - name: "idx_question_categories_name"
          columns: ["name"]

    - name: "questions"
      columns:
        - name: "id"
          type: "TEXT"
          primaryKey: true
        - name: "content"
          type: "TEXT"
          nullable: false
        - name: "type"
          type: "TEXT"
          nullable: false
          constraints: "CHECK(type IN ('single', 'multiple', 'judgment', 'text'))"
        - name: "category"
          type: "TEXT"
          nullable: false
          default: "'通用'"
          comment: "题目类别名称 (无类别时默认通用)"
        - name: "options"
          type: "TEXT"
          comment: "JSON格式存储选项"
        - name: "answer"
          type: "TEXT"
          nullable: false
        - name: "score"
          type: "INTEGER"
          nullable: false
          constraints: "CHECK(score > 0)"
        - name: "created_at"
          type: "DATETIME"
          default: "CURRENT_TIMESTAMP"
      indexes:
        - name: "idx_questions_type"
          columns: ["type"]
        - name: "idx_questions_category"
          columns: ["category"]
        - name: "idx_questions_score"
          columns: ["score"]

    - name: "exam_subjects"
      columns:
        - name: "id"
          type: "TEXT"
          primaryKey: true
        - name: "name"
          type: "TEXT"
          nullable: false
          unique: true
        - name: "total_score"
          type: "INTEGER"
          nullable: false
          constraints: "CHECK(total_score > 0)"
        - name: "time_limit_minutes"
          type: "INTEGER"
          nullable: false
          default: "60"
          constraints: "CHECK(time_limit_minutes > 0)"
        - name: "type_ratios"
          type: "TEXT"
          nullable: false
          comment: "题型比重 JSON (single/multiple/judgment/text)"
        - name: "category_ratios"
          type: "TEXT"
          nullable: false
          comment: "题目类别比重 JSON (categoryName->ratio)"
        - name: "created_at"
          type: "DATETIME"
          default: "CURRENT_TIMESTAMP"
        - name: "updated_at"
          type: "DATETIME"
          default: "CURRENT_TIMESTAMP"
      indexes:
        - name: "idx_exam_subjects_name"
          columns: ["name"]

    - name: "exam_tasks"
      columns:
        - name: "id"
          type: "TEXT"
          primaryKey: true
        - name: "name"
          type: "TEXT"
          nullable: false
        - name: "subject_id"
          type: "TEXT"
          nullable: false
          foreignKey:
            table: "exam_subjects"
            column: "id"
        - name: "start_at"
          type: "DATETIME"
          nullable: false
        - name: "end_at"
          type: "DATETIME"
          nullable: false
        - name: "created_at"
          type: "DATETIME"
          default: "CURRENT_TIMESTAMP"
      indexes:
        - name: "idx_exam_tasks_subject_id"
          columns: ["subject_id"]
        - name: "idx_exam_tasks_start_at"
          columns: ["start_at"]
        - name: "idx_exam_tasks_end_at"
          columns: ["end_at"]

    - name: "exam_task_users"
      columns:
        - name: "id"
          type: "TEXT"
          primaryKey: true
        - name: "task_id"
          type: "TEXT"
          nullable: false
          foreignKey:
            table: "exam_tasks"
            column: "id"
        - name: "user_id"
          type: "TEXT"
          nullable: false
          foreignKey:
            table: "users"
            column: "id"
        - name: "assigned_at"
          type: "DATETIME"
          default: "CURRENT_TIMESTAMP"
      indexes:
        - name: "idx_exam_task_users_task_id"
          columns: ["task_id"]
        - name: "idx_exam_task_users_user_id"
          columns: ["user_id"]

    - name: "quiz_records"
      columns:
        - name: "id"
          type: "TEXT"
          primaryKey: true
        - name: "user_id"
          type: "TEXT"
          nullable: false
          foreignKey:
            table: "users"
            column: "id"
        - name: "total_score"
          type: "INTEGER"
          nullable: false
        - name: "correct_count"
          type: "INTEGER"
          nullable: false
        - name: "total_count"
          type: "INTEGER"
          nullable: false
        - name: "created_at"
          type: "DATETIME"
          default: "CURRENT_TIMESTAMP"
      indexes:
        - name: "idx_quiz_records_user_id"
          columns: ["user_id"]
        - name: "idx_quiz_records_created_at"
          columns: ["created_at"]

    - name: "quiz_answers"
      columns:
        - name: "id"
          type: "TEXT"
          primaryKey: true
        - name: "record_id"
          type: "TEXT"
          nullable: false
          foreignKey:
            table: "quiz_records"
            column: "id"
        - name: "question_id"
          type: "TEXT"
          nullable: false
          foreignKey:
            table: "questions"
            column: "id"
        - name: "user_answer"
          type: "TEXT"
          nullable: false
        - name: "score"
          type: "INTEGER"
          nullable: false
        - name: "is_correct"
          type: "BOOLEAN"
          nullable: false
        - name: "created_at"
          type: "DATETIME"
          default: "CURRENT_TIMESTAMP"
      indexes:
        - name: "idx_quiz_answers_record_id"
          columns: ["record_id"]
        - name: "idx_quiz_answers_question_id"
          columns: ["question_id"]

    - name: "system_configs"
      columns:
        - name: "id"
          type: "TEXT"
          primaryKey: true
        - name: "config_type"
          type: "TEXT"
          nullable: false
          unique: true
        - name: "config_value"
          type: "TEXT"
          nullable: false
        - name: "updated_at"
          type: "DATETIME"
          default: "CURRENT_TIMESTAMP"