feat(23-00): DB migration and shared types for message_type

- Add message_type text column to chat_messages Drizzle schema
- Create SQL migration 0049_add_message_type.sql
- Update _journal.json with entries for idx 47, 48, 49
- Add messageType field to ChatMessage interface
- Add messageType to createMessageSchema (optional)
- Add handoffSchema and Handoff type to validators/chat.ts
- Re-export handoffSchema and Handoff from shared/src/index.ts

packages/db/src/migrations/0049_add_message_type.sql

@@ -0,0 +1 @@
+ALTER TABLE "chat_messages" ADD COLUMN "message_type" text;

packages/db/src/schema/chat_messages.ts

@@ -10,6 +10,7 @@ export const chatMessages = pgTable(
     role: text("role").notNull(),
     content: text("content").notNull(),
     agentId: uuid("agent_id"),
+    messageType: text("message_type"),
     createdAt: timestamp("created_at", { withTimezone: true }).notNull().defaultNow(),
     updatedAt: timestamp("updated_at", { withTimezone: true }).defaultNow(),
   },

packages/shared/src/index.ts

@@ -592,9 +592,11 @@ export {
   createConversationSchema,
   updateConversationSchema,
   createMessageSchema,
+  handoffSchema,
   type CreateConversation,
   type UpdateConversation,
   type CreateMessage,
+  type Handoff,
 } from "./validators/index.js";
 
 export type {

packages/shared/src/types/chat.ts

@@ -27,6 +27,7 @@ export interface ChatMessage {
   role: "user" | "assistant" | "system";
   content: string;
   agentId: string | null;
+  messageType: string | null;
   createdAt: string;
   updatedAt: string | null;
 }

packages/shared/src/validators/chat.ts

@@ -16,8 +16,20 @@ export const createMessageSchema = z.object({
   role: z.enum(["user", "assistant", "system"]),
   content: z.string().min(1).max(100_000),
   agentId: z.string().uuid().optional(),
+  messageType: z.string().optional(),
+});
+
+export const handoffSchema = z.object({
+  spec: z.object({
+    what: z.string().min(1),
+    why: z.string().min(1),
+    constraints: z.string().optional().default(""),
+    success: z.string().optional().default(""),
+  }),
+  targetRole: z.enum(["pm", "engineer", "general"]),
 });
 
 export type CreateConversation = z.infer<typeof createConversationSchema>;
 export type UpdateConversation = z.infer<typeof updateConversationSchema>;
 export type CreateMessage = z.infer<typeof createMessageSchema>;
+export type Handoff = z.infer<typeof handoffSchema>;