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doc_mall/consumer/sql/add_footprints_table.sql

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+-- 1. 创建足迹表
+CREATE TABLE IF NOT EXISTS ml_user_footprints (
+  id UUID DEFAULT uuid_generate_v4() PRIMARY KEY,
+  user_id UUID NOT NULL DEFAULT auth.uid(),
+  product_id UUID NOT NULL, -- 如果 ml_products 表存在，可以改为: product_id UUID NOT NULL REFERENCES ml_products(id) ON DELETE CASCADE
+  created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+  UNIQUE(user_id, product_id) -- 复合唯一索引，防止同一商品重复记录
+);
+
+-- 2. 添加表注释
+COMMENT ON TABLE ml_user_footprints IS '用户浏览足迹表';
+COMMENT ON COLUMN ml_user_footprints.user_id IS '用户ID';
+COMMENT ON COLUMN ml_user_footprints.product_id IS '商品ID';
+COMMENT ON COLUMN ml_user_footprints.updated_at IS '最后访问时间';
+
+-- 3. 启用行级安全策略 (RLS)
+ALTER TABLE ml_user_footprints ENABLE ROW LEVEL SECURITY;
+
+-- 4. 添加安全策略 (增删改查仅限本人)
+-- 查看策略
+CREATE POLICY "Users can view their own footprints" 
+  ON ml_user_footprints FOR SELECT 
+  USING (auth.uid() = user_id);
+
+-- 插入策略
+CREATE POLICY "Users can insert their own footprints" 
+  ON ml_user_footprints FOR INSERT 
+  WITH CHECK (auth.uid() = user_id);
+
+-- 更新策略
+CREATE POLICY "Users can update their own footprints" 
+  ON ml_user_footprints FOR UPDATE 
+  USING (auth.uid() = user_id);
+
+-- 删除策略
+CREATE POLICY "Users can delete their own footprints" 
+  ON ml_user_footprints FOR DELETE 
+  USING (auth.uid() = user_id);
+
+-- 5. 建立索引以优化查询速度
+CREATE INDEX IF NOT EXISTS idx_footprints_user_updated 
+  ON ml_user_footprints (user_id, updated_at DESC);