Remove unsued PolledMessages struct

server/src/streaming/models/messages.rs

diff --git a/server/src/streaming/models/messages.rs b/server/src/streaming/models/messages.rs
index ef8b852..9f45989 100644
--- a/server/src/streaming/models/messages.rs
+++ b/server/src/streaming/models/messages.rs
@@ -5,17 +5,7 @@
 use iggy::models::messages::PolledMessage;
 use iggy::utils::checksum;
 use iggy::{messages::send_messages::Message, models::messages::MessageState};
-use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
-use std::sync::Arc;
-
-// It's the same as PolledMessages from Iggy models, but with the Arc<Message> instead of Message.
-#[derive(Debug, Serialize, Deserialize)]
-pub struct PolledMessages {
-    pub partition_id: u32,
-    pub current_offset: u64,
-    pub messages: Vec<Arc<PolledMessage>>,
-}
 
 #[derive(Debug)]
 pub struct RetainedMessage {