chore: update the supportconversation schema

apps/edr-passenger-api/prisma/schema.prisma

@@ -299,6 +299,7 @@ model Passenger {
   travelerProfiles         TravelerProfile[]
   savedRoutes              SavedRoute[]
   packageBookings          PackageBooking[]
+  supportConversations     SupportConversation[]
   @@index([userId])
   @@index([iamUserId])
   @@schema("passenger")
@@ -881,12 +882,24 @@ model FaqArticle {
 }
 
 model SupportConversation {
-  id              String                    @id @default(uuid())
-  userId          String
-  assignedAgentId String?
-  status          SupportConversationStatus @default(OPEN)
-  createdAt       DateTime                  @default(now())
-  messages        SupportMessage[]
+  id                 String                    @id @default(uuid())
+  userId             String
+  passengerId        String?
+  passengerName      String?
+  subject            String?
+  assignedAgentId    String?
+  status             SupportConversationStatus @default(OPEN)
+  lastMessageAt      DateTime?
+  lastMessagePreview String?
+  lastMessageSender  SupportSender?
+  userLastReadAt     DateTime?
+  agentLastReadAt    DateTime?
+  createdAt          DateTime                  @default(now())
+  updatedAt          DateTime                  @updatedAt @default(now())
+  messages           SupportMessage[]
+  passenger          Passenger?                @relation(fields: [passengerId], references: [id])
+  @@index([userId])
+  @@index([status, lastMessageAt])
   @@schema("passenger")
 }