feat: 工作台聊天室功能

src/server/db/schema.ts

@@ -45,6 +45,38 @@ export const models = sqliteTable(
   ],
 );
 
+export const conversations = sqliteTable(
+  "conversations",
+  {
+    createdAt: text("created_at").notNull(),
+    id: text("id").primaryKey(),
+    modelId: text("model_id")
+      .notNull()
+      .references(() => models.id),
+    projectId: text("project_id")
+      .notNull()
+      .references(() => projects.id),
+    title: text("title").notNull().default("新会话"),
+    updatedAt: text("updated_at").notNull(),
+  },
+  (table) => [index("conversations_project_id_idx").on(table.projectId)],
+);
+
+export const messages = sqliteTable(
+  "messages",
+  {
+    content: text("content").notNull().default(""),
+    conversationId: text("conversation_id")
+      .notNull()
+      .references(() => conversations.id, { onDelete: "cascade" }),
+    createdAt: text("created_at").notNull(),
+    id: text("id").primaryKey(),
+    parts: text("parts"),
+    role: text("role", { enum: ["assistant", "system", "user"] }).notNull(),
+  },
+  (table) => [index("messages_conversation_id_idx").on(table.conversationId)],
+);
+
 export const schemaMigrations = sqliteTable("schema_migrations", {
   appliedAt: text("applied_at").notNull(),
   checksum: text("checksum").notNull(),