Use external DB/Redis in compose and preserve auth session across rebuilds

Frontend/server/utils/auth.ts

@@ -69,7 +69,24 @@ export async function getAuthContext(event: H3Event): Promise<AuthContext> {
   });
 
   if (!conv) {
-    throw createError({ statusCode: 401, statusMessage: "Unauthorized" });
+    // Recover from stale conversation cookie after rebuild/reset:
+    // reuse latest available conversation (or recreate default one) and refresh cookie.
+    const fallback =
+      (await prisma.chatConversation.findFirst({
+        where: { teamId: team.id, createdByUserId: user.id },
+        orderBy: { updatedAt: "desc" },
+      })) ||
+      (await prisma.chatConversation.create({
+        data: { id: `pilot-${team.id}`, teamId: team.id, createdByUserId: user.id, title: "Pilot" },
+      }));
+
+    setSession(event, {
+      teamId: team.id,
+      userId: user.id,
+      conversationId: fallback.id,
+    });
+
+    return { teamId: team.id, userId: user.id, conversationId: fallback.id };
   }
 
   return { teamId: team.id, userId: user.id, conversationId: conv.id };