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				+# AI日记 
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				+ 
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				+# 数据范式设计 
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				+ 
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				+您是一名专业的数据库工程师,然悉PostgreSQL和ParseServer请注意表名用大驼峰。字段小驼峰。有预留字段:objectId、updatedAt、createdAt 
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				+关于ParseServer中数据类的描述,字段的主要类型有: 
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				+String => String 
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				+Number => Number 
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				+Bool => bool 
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				+Array => JSON Array 
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				+Object => JSON Object 
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				+Date => Date 
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				+File => Parse.File 
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				+Pointer => other Parse.Object 
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				+Relation => Parse.Relation 
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				+Null => null 
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				+GeoPoint =>{latitude: 40.0, longitude: -30.0} 
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				+ 
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				+>项目需求 
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				+AI日记的辅助AI应用,用户(User)、日记、聊天消息、动态、互动(点赞、评论、分享等 ),请您根据行业经验,设计以上五张表、用户直接用预留的_User表即可 
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				+>输出结果(UML类图) 
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				+请您帮我用plantuml的类图描述设计好的几张表及其关系 
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				+ 
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				+>输出结果(信息结构图) 
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				+请您帮我用markmap式表示上面的信息结构图 
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				+ 
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				+>输出结果(SQL语句) 
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				+请您帮我用sql格式给我建表语句和测试数据插入语句,注意字段请使用小驼峰用""引起来。 
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				+ 
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				+# UML类图 
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				+```plantuml 
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				+@startuml AI日记系统数据库设计 
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				+ 
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				+class _User { 
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				+  .. 系统预留字段 .. 
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				+  + objectId: String 
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				+  + username: String 
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				+  + email: String 
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				+  + emailVerified: bool 
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				+  + authData: Object 
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				+  + password: String 
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				+  + createdAt: Date 
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				+  + updatedAt: Date 
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				+  .. 自定义字段 .. 
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				+  + nickname: String 
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				+  + avatar: File 
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				+  + bio: String 
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				+  + lastActiveAt: Date 
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				+  + privacySettings: Object 
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				+} 
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				+ 
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				+class Diary { 
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				+  + objectId: String 
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				+  + createdAt: Date 
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				+  + updatedAt: Date 
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				+  + title: String 
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				+  + content: String 
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				+  + author: Pointer<_User> 
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				+  + mood: String 
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				+  + tags: Array 
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				+  + isPublic: bool 
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				+  + location: GeoPoint 
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				+  + weather: Object 
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				+  + aiAnalysis: Object 
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				+} 
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				+ 
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				+class ChatMessage { 
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				+  + objectId: String 
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				+  + createdAt: Date 
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				+  + updatedAt: Date 
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				+  + sender: Pointer<_User> 
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				+  + receiver: Pointer<_User> 
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				+  + content: String 
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				+  + diaryRef: Pointer<Diary> 
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				+  + isRead: bool 
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				+  + messageType: String 
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				+  + attachments: Array<File> 
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				+} 
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				+ 
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				+class Moment { 
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				+  + objectId: String 
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				+  + createdAt: Date 
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				+  + updatedAt: Date 
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				+  + creator: Pointer<_User> 
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				+  + content: String 
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				+  + images: Array<File> 
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				+  + refDiary: Pointer<Diary> 
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				+  + location: GeoPoint 
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				+  + tags: Array 
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				+  + interactionCount: Number 
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				+} 
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				+ 
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				+class Interaction { 
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				+  + objectId: String 
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				+  + createdAt: Date 
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				+  + updatedAt: Date 
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				+  + type: String 
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				+  + fromUser: Pointer<_User> 
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				+  + toUser: Pointer<_User> 
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				+  + targetType: String 
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				+  + targetId: Pointer 
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				+  + content: String 
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				+  + status: String 
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				+} 
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				+ 
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				+' 关系定义 
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				+_User "1" *-- "many" Diary : 创作 
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				+_User "1" *-- "many" ChatMessage : 发送 
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				+_User "1" *-- "many" Moment : 发布 
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				+_User "1" *-- "many" Interaction : 发起 
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				+ 
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				+Diary "1" *-- "many" ChatMessage : 关联 
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				+Diary "1" *-- "many" Moment : 引用 
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				+Diary "1" *-- "many" Interaction : 接收 
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				+ 
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				+Moment "1" *-- "many" Interaction : 接收 
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				+ 
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				+@enduml 
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				+``` 
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				+# SQL语句 
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				+ 
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				+### 建表语句 
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				+```sql 
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				+<!-- -- 注意:实际使用ParseServer时_User表已存在,此处仅为演示字段结构 --> 
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				+CREATE TABLE "_User" ( 
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				+  "objectId" VARCHAR(36) PRIMARY KEY, 
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				+  "username" VARCHAR(255) UNIQUE NOT NULL, 
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				+  "email" VARCHAR(255) UNIQUE, 
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				+  "emailVerified" BOOLEAN DEFAULT false, 
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				+  "authData" JSONB, 
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				+  "password" VARCHAR(255), 
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				+  "createdAt" TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP, 
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				+  "updatedAt" TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP, 
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				+  "nickname" VARCHAR(100), 
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				+  "avatar" VARCHAR(255), -- Parse.File存储路径 
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				+  "bio" TEXT, 
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				+  "lastActiveAt" TIMESTAMP WITH TIME ZONE, 
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				+  "privacySettings" JSONB 
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				+); 
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				+ 
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				+CREATE TABLE "Diary" ( 
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				+  "objectId" VARCHAR(36) PRIMARY KEY, 
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				+  "createdAt" TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP, 
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				+  "updatedAt" TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP, 
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				+  "title" VARCHAR(200) NOT NULL, 
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				+  "content" TEXT NOT NULL, 
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				+  "author" VARCHAR(36) REFERENCES "_User"("objectId"), 
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				+  "mood" VARCHAR(50), 
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				+  "tags" JSONB DEFAULT '[]'::JSONB, 
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				+  "isPublic" BOOLEAN DEFAULT false, 
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				+  "location" JSONB, -- {latitude: xx, longitude: xx} 
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				+  "weather" JSONB, 
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				+  "aiAnalysis" JSONB 
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				+); 
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				+ 
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				+CREATE TABLE "ChatMessage" ( 
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				+  "objectId" VARCHAR(36) PRIMARY KEY, 
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				+  "createdAt" TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP, 
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				+  "updatedAt" TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP, 
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				+  "sender" VARCHAR(36) REFERENCES "_User"("objectId"), 
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				+  "receiver" VARCHAR(36) REFERENCES "_User"("objectId"), 
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				+  "content" TEXT, 
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				+  "diaryRef" VARCHAR(36) REFERENCES "Diary"("objectId"), 
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				+  "isRead" BOOLEAN DEFAULT false, 
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				+  "messageType" VARCHAR(20) DEFAULT 'text', 
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				+  "attachments" JSONB DEFAULT '[]'::JSONB 
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				+); 
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				+ 
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				+CREATE TABLE "Moment" ( 
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				+  "objectId" VARCHAR(36) PRIMARY KEY, 
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				+  "createdAt" TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP, 
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				+  "updatedAt" TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP, 
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				+  "creator" VARCHAR(36) REFERENCES "_User"("objectId"), 
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				+  "content" TEXT, 
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				+  "images" JSONB DEFAULT '[]'::JSONB, -- Parse.File路径数组 
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				+  "refDiary" VARCHAR(36) REFERENCES "Diary"("objectId"), 
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				+  "location" JSONB, 
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				+  "tags" JSONB DEFAULT '[]'::JSONB, 
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				+  "interactionCount" INTEGER DEFAULT 0 
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				+); 
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				+ 
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				+CREATE TABLE "Interaction" ( 
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				+  "objectId" VARCHAR(36) PRIMARY KEY, 
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				+  "createdAt" TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP, 
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				+  "updatedAt" TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP, 
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				+  "type" VARCHAR(20) NOT NULL, -- like/comment/share 
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				+  "fromUser" VARCHAR(36) REFERENCES "_User"("objectId"), 
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				+  "toUser" VARCHAR(36) REFERENCES "_User"("objectId"), 
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				+  "targetType" VARCHAR(20) NOT NULL, -- Diary/Moment 
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				+  "targetId" VARCHAR(36), -- 多态关联 
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				+  "content" TEXT, 
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				+  "status" VARCHAR(20) DEFAULT 'unread' 
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				+); 
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				+``` 
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				+ 
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				+###  测试数据插入语句 
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				+```sql 
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				+-- 插入测试用户 
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				+INSERT INTO "_User" ("objectId", "username", "email", "nickname", "createdAt") VALUES 
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				+('usr001', 'alice123', 'alice@example.com', 'Alice', NOW()), 
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				+('usr002', 'bob456', 'bob@example.com', 'Bob', NOW()); 
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				+ 
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				+-- 插入日记 
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				+INSERT INTO "Diary" ("objectId", "title", "content", "author", "createdAt") VALUES 
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				+('d001', '美好的一天', '今天天气晴朗...', 'usr001', NOW()), 
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				+('d002', '项目总结', '完成了数据库设计...', 'usr002', NOW()); 
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				+ 
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				+-- 插入动态 
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				+INSERT INTO "Moment" ("objectId", "creator", "content", "refDiary", "createdAt") VALUES 
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				+('m001', 'usr001', '分享我的日记', 'd001', NOW()), 
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				+('m002', 'usr002', '技术分享', 'd002', NOW()); 
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				+ 
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				+-- 插入互动 
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				+INSERT INTO "Interaction" ("objectId", "type", "fromUser", "toUser", "targetType", "targetId", "content") VALUES 
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				+('i001', 'like', 'usr002', 'usr001', 'Diary', 'd001', NULL), 
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				+('i002', 'comment', 'usr001', 'usr002', 'Moment', 'm002', '写得真好!'); 
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				+ 
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				+-- 插入聊天消息 
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				+INSERT INTO "ChatMessage" ("objectId", "sender", "receiver", "content", "diaryRef") VALUES 
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				+('msg001', 'usr001', 'usr002', '你好,看了你的日记', 'd002'), 
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				+('msg002', 'usr002', 'usr001', '谢谢关注!', 'd002'); 
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				+``` 
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