feat(数据库): 添加对话分享表和迁移文件

- 新增 sharedConversations 表用于存储分享信息
- 支持分享短链接码、内容控制选项、浏览统计
- 添加选择性消息分享功能（selectedMessageIds）
- 完善表关系定义和类型导出

src/drizzle/migrations/0013_charming_natasha_romanoff.sql

@@ -0,0 +1,18 @@
+CREATE TABLE "shared_conversations" (
+	"id" serial PRIMARY KEY NOT NULL,
+	"share_id" varchar(64) NOT NULL,
+	"conversation_id" varchar(64) NOT NULL,
+	"user_id" varchar(64) NOT NULL,
+	"share_code" varchar(12) NOT NULL,
+	"title" varchar(255),
+	"description" text,
+	"include_thinking" boolean DEFAULT true,
+	"include_tool_calls" boolean DEFAULT false,
+	"include_images" boolean DEFAULT true,
+	"view_count" integer DEFAULT 0,
+	"is_active" boolean DEFAULT true,
+	"created_at" timestamp with time zone DEFAULT now(),
+	"updated_at" timestamp with time zone DEFAULT now(),
+	CONSTRAINT "shared_conversations_share_id_unique" UNIQUE("share_id"),
+	CONSTRAINT "shared_conversations_share_code_unique" UNIQUE("share_code")
+);

src/drizzle/migrations/0014_naive_kronos.sql

@@ -0,0 +1 @@
+ALTER TABLE "shared_conversations" ADD COLUMN "snapshot_at" timestamp with time zone;

src/drizzle/migrations/meta/_journal.json

@@ -92,6 +92,20 @@
       "when": 1766339459689,
       "tag": "0012_flippant_marvel_apes",
       "breakpoints": true
+    },
+    {
+      "idx": 13,
+      "version": "7",
+      "when": 1766540812748,
+      "tag": "0013_charming_natasha_romanoff",
+      "breakpoints": true
+    },
+    {
+      "idx": 14,
+      "version": "7",
+      "when": 1766546111189,
+      "tag": "0014_naive_kronos",
+      "breakpoints": true
     }
   ]
 }

src/drizzle/schema.ts

@@ -313,6 +313,40 @@ export const promptOptimizations = pgTable('prompt_optimizations', {
   createdAt: timestamp('created_at', { withTimezone: true }).defaultNow(),
 });
 
+// ============================================
+// 对话分享表
+// ============================================
+export const sharedConversations = pgTable('shared_conversations', {
+  id: serial('id').primaryKey(),
+  // 分享唯一标识
+  shareId: varchar('share_id', { length: 64 }).notNull().unique(),
+  // 关联对话
+  conversationId: varchar('conversation_id', { length: 64 }).notNull(),
+  // 分享创建者
+  userId: varchar('user_id', { length: 64 }).notNull(),
+  // 短链接码（用于分享 URL）
+  shareCode: varchar('share_code', { length: 12 }).notNull().unique(),
+  // 分享标题（可自定义）
+  title: varchar('title', { length: 255 }),
+  // 分享描述
+  description: text('description'),
+  // 内容控制
+  includeThinking: boolean('include_thinking').default(true),
+  includeToolCalls: boolean('include_tool_calls').default(false),
+  includeImages: boolean('include_images').default(true),
+  // 统计信息
+  viewCount: integer('view_count').default(0),
+  // 状态
+  isActive: boolean('is_active').default(true),
+  // 快照时间点（只显示此时间之前的消息）
+  snapshotAt: timestamp('snapshot_at', { withTimezone: true }),
+  // 选择的消息ID列表（JSON数组，null 表示全部消息）
+  selectedMessageIds: jsonb('selected_message_ids').$type<string[]>(),
+  // 时间戳
+  createdAt: timestamp('created_at', { withTimezone: true }).defaultNow(),
+  updatedAt: timestamp('updated_at', { withTimezone: true }).defaultNow(),
+});
+
 // ============================================
 // 关系定义
 // ============================================
@@ -399,6 +433,18 @@ export const notesRelations = relations(notes, ({ one }) => ({
   }),
 }));
 
+// 分享关系
+export const sharedConversationsRelations = relations(sharedConversations, ({ one }) => ({
+  user: one(users, {
+    fields: [sharedConversations.userId],
+    references: [users.userId],
+  }),
+  conversation: one(conversations, {
+    fields: [sharedConversations.conversationId],
+    references: [conversations.conversationId],
+  }),
+}));
+
 // ============================================
 // 类型定义
 // ============================================
@@ -469,3 +515,6 @@ export type NewNote = typeof notes.$inferInsert;
 
 export type PromptOptimization = typeof promptOptimizations.$inferSelect;
 export type NewPromptOptimization = typeof promptOptimizations.$inferInsert;
+
+export type SharedConversation = typeof sharedConversations.$inferSelect;
+export type NewSharedConversation = typeof sharedConversations.$inferInsert;