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database/migrations/add_topics_tables.sql

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+-- 添加专题功能相关表
+-- 创建时间: 2024-01-20
+
+-- 专题表
+CREATE TABLE IF NOT EXISTS topics (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  name VARCHAR(100) UNIQUE NOT NULL,
+  description TEXT,
+  cover_image VARCHAR(500),
+  sort_order INTEGER DEFAULT 0,
+  status VARCHAR(20) DEFAULT 'active',
+  created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+  updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
+);
+
+-- 视频专题关联表（多对多关系）
+CREATE TABLE IF NOT EXISTS video_topics (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  video_id INTEGER NOT NULL,
+  topic_id INTEGER NOT NULL,
+  created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+  FOREIGN KEY (video_id) REFERENCES videos(id) ON DELETE CASCADE,
+  FOREIGN KEY (topic_id) REFERENCES topics(id) ON DELETE CASCADE,
+  UNIQUE(video_id, topic_id)
+);
+
+-- 创建索引提高查询性能
+CREATE INDEX IF NOT EXISTS idx_video_topics_video_id ON video_topics(video_id);
+CREATE INDEX IF NOT EXISTS idx_video_topics_topic_id ON video_topics(topic_id);
+CREATE INDEX IF NOT EXISTS idx_topics_status ON topics(status);
+CREATE INDEX IF NOT EXISTS idx_topics_sort_order ON topics(sort_order);
+
+-- 插入默认专题
+INSERT OR IGNORE INTO topics (name, description, sort_order) VALUES 
+('历史纪录片', '高句丽历史相关的纪录片和教育视频', 1),
+('文化艺术', '传统文化艺术表演和展示', 2),
+('考古发现', '考古发现和文物研究相关视频', 3),
+('语言教学', '高句丽语言学习和教学视频', 4),
+('民俗传统', '传统民俗风情和节庆活动', 5),
+('建筑遗迹', '古代建筑和遗迹介绍', 6),
+('专家讲座', '学者专家的学术讲座和分析', 7),
+('文物展示', '珍贵文物的展示和介绍', 8);
+
+-- 为现有视频随机分配专题（示例数据）
+INSERT OR IGNORE INTO video_topics (video_id, topic_id)
+SELECT v.id, t.id
+FROM videos v
+CROSS JOIN topics t
+WHERE 
+  (v.id = 1 AND t.name IN ('历史纪录片', '专家讲座')) OR
+  (v.id = 2 AND t.name IN ('文化艺术', '民俗传统')) OR
+  (v.id = 3 AND t.name IN ('建筑遗迹', '历史纪录片')) OR
+  (v.id = 4 AND t.name IN ('语言教学')) OR
+  (v.id = 5 AND t.name IN ('考古发现', '文物展示'));