chat: remember last model

server/src/llm/streaming.ts

@@ -29,6 +29,23 @@ export async function* runMultiplexStream(req: MultiplexRequest): AsyncGenerator
     select: { id: true },
   });
 
+  await prisma.$transaction([
+    prisma.chat.update({
+      where: { id: chatId },
+      data: {
+        lastUsedProvider: req.provider as any,
+        lastUsedModel: req.model,
+      },
+    }),
+    prisma.chat.updateMany({
+      where: { id: chatId, initiatedProvider: null },
+      data: {
+        initiatedProvider: req.provider as any,
+        initiatedModel: req.model,
+      },
+    }),
+  ]);
+
   yield { type: "meta", chatId, callId: call.id, provider: req.provider, model: req.model };
 
   let text = "";