chore: import upstream snapshot with attribution

apps/sim/lib/copilot/chat/list-mothership-chats.ts

@@ -0,0 +1,50 @@
+import { db } from '@sim/db'
+import { copilotChats } from '@sim/db/schema'
+import { and, desc, eq } from 'drizzle-orm'
+import type { MothershipChat } from '@/lib/api/contracts/mothership-chats'
+import { reconcileChatStreamMarkers } from '@/lib/copilot/chat/stream-liveness'
+
+/**
+ * Lists a user's mothership (home) chats for a workspace as the contract wire
+ * shape, shared by the `GET /api/mothership/chats` route and the workspace
+ * sidebar prefetch. Performs no auth or workspace-access checks — callers
+ * enforce access before invoking. Reconciles stale live-stream markers and
+ * normalizes timestamps to ISO strings to honor the wire contract.
+ */
+export async function listMothershipChats(
+  userId: string,
+  workspaceId: string
+): Promise<MothershipChat[]> {
+  const chats = await db
+    .select({
+      id: copilotChats.id,
+      title: copilotChats.title,
+      updatedAt: copilotChats.updatedAt,
+      activeStreamId: copilotChats.conversationId,
+      lastSeenAt: copilotChats.lastSeenAt,
+      pinned: copilotChats.pinned,
+    })
+    .from(copilotChats)
+    .where(
+      and(
+        eq(copilotChats.userId, userId),
+        eq(copilotChats.workspaceId, workspaceId),
+        eq(copilotChats.type, 'mothership')
+      )
+    )
+    .orderBy(desc(copilotChats.pinned), desc(copilotChats.updatedAt))
+
+  const streamMarkers = await reconcileChatStreamMarkers(
+    chats.map((c) => ({ chatId: c.id, streamId: c.activeStreamId })),
+    { repairVerifiedStaleMarkers: true }
+  )
+
+  return chats.map((c) => ({
+    id: c.id,
+    title: c.title,
+    updatedAt: c.updatedAt.toISOString(),
+    activeStreamId: streamMarkers.get(c.id)?.streamId ?? null,
+    lastSeenAt: c.lastSeenAt ? c.lastSeenAt.toISOString() : null,
+    pinned: c.pinned,
+  }))
+}