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sql/images.sql

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+-- 图片主表基础版
+CREATE TABLE images (
+    -- 核心标识字段
+    image_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    
+    -- 存储元数据
+    storage_key TEXT NOT NULL CHECK (storage_key ~ '^[a-z0-9/-]+$'),
+    file_name TEXT NOT NULL,
+    mime_type VARCHAR(32) NOT NULL CHECK (mime_type LIKE 'image/%'),
+    file_size BIGINT NOT NULL CHECK (file_size > 0),
+    width INT CHECK (width > 0),
+    height INT CHECK (height > 0),
+    
+    -- 业务元数据
+    category_id UUID, -- 分类服务提供的UUID
+    tags TEXT[] DEFAULT '{}'::TEXT[],
+    
+    -- 系统管控字段
+    created_at TIMESTAMPTZ DEFAULT NOW() NOT NULL,
+    updated_at TIMESTAMPTZ DEFAULT NOW() NOT NULL,
+    is_deleted BOOLEAN DEFAULT FALSE NOT NULL
+);
+
+-- 索引配置
+CREATE INDEX idx_images_category ON images (category_id);
+CREATE INDEX idx_images_created ON images (created_at);
+CREATE INDEX idx_images_tags ON images USING GIN(tags);
+
+-- 自动更新时间触发器
+CREATE OR REPLACE FUNCTION update_image_modified()
+RETURNS TRIGGER AS $$
+BEGIN
+    NEW.updated_at = NOW();
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trg_update_image
+BEFORE UPDATE ON images
+FOR EACH ROW EXECUTE FUNCTION update_image_modified();