refactor(bot): limit lock scope for history and tidy progress output

- Reordered imports for clarity (chrono and tokio::time::Instant).
- Fixed comment indentation around compact automation note.
- Refactored session history retrieval to acquire the mutex only briefly, then process compacted message skipping and history limiting outside the lock.
- Added explanatory comments for the new lock handling logic.
- Cleaned up token progress calculation and display formatting, improving readability of GPU/CPU/TOKENS bars.
- Minor formatting adjustments throughout the file.

src/bot/mod.rs

@@ -6,16 +6,16 @@ use crate::shared::models::{BotResponse, Suggestion, UserMessage, UserSession};
 use crate::shared::state::AppState;
 use actix_web::{web, HttpRequest, HttpResponse, Result};
 use actix_ws::Message as WsMessage;
-use chrono::{Utc};
+use chrono::Utc;
 use diesel::PgConnection;
 use log::{error, info, trace, warn};
 use serde_json;
-use tokio::time::Instant;
 use std::collections::HashMap;
 use std::sync::Arc;
 use std::time::Duration;
 use tokio::sync::mpsc;
 use tokio::sync::Mutex as AsyncMutex;
+use tokio::time::Instant;
 use uuid::Uuid;
 
 pub fn get_default_bot(conn: &mut PgConnection) -> (Uuid, String) {
@@ -407,21 +407,25 @@ impl BotOrchestrator {
                 .unwrap_or(-1)
         };
 
+        // Acquire lock briefly for history retrieval with configurable limit
+        let history = {
             let mut sm = self.state.session_manager.lock().await;
             let mut history = sm.get_conversation_history(session.id, user_id)?;
 
             // Skip all messages before the most recent compacted message (type 9)
-        if let Some(last_compacted_index) = history.iter().rposition(|(role, content)| {
-            role == "COMPACTED" || content.starts_with("SUMMARY:")
-        }) {
+            if let Some(last_compacted_index) = history
+                .iter()
+                .rposition(|(role, content)| role == "COMPACTED" || content.starts_with("SUMMARY:"))
+            {
                 history = history.split_off(last_compacted_index);
             }
 
-        // Apply history limit if configured
             if history_limit > 0 && history.len() > history_limit as usize {
                 let start = history.len() - history_limit as usize;
                 history.drain(0..start);
             }
+            history
+        };
 
         let mut prompt = String::new();
         if !system_prompt.is_empty() {
@@ -560,9 +564,11 @@ impl BotOrchestrator {
 
                 // Update progress if interval elapsed
                 if last_progress_update.elapsed() >= progress_interval {
-                    let current_tokens = initial_tokens + crate::shared::utils::estimate_token_count(&full_response);
+                    let current_tokens =
+                        initial_tokens + crate::shared::utils::estimate_token_count(&full_response);
                     if let Ok(metrics) = get_system_metrics(current_tokens, max_context_size) {
-let gpu_bar = "█".repeat((metrics.gpu_usage.unwrap_or(0.0) / 5.0).round() as usize);
+                        let gpu_bar =
+                            "█".repeat((metrics.gpu_usage.unwrap_or(0.0) / 5.0).round() as usize);
                         let cpu_bar = "█".repeat((metrics.cpu_usage / 5.0).round() as usize);
                         let token_ratio = current_tokens as f64 / max_context_size.max(1) as f64;
                         let token_bar = "█".repeat((token_ratio * 20.0).round() as usize);
@@ -612,24 +618,31 @@ trace!(
         let total_tokens = crate::shared::utils::estimate_token_count(&prompt)
             + crate::shared::utils::estimate_token_count(&context_data)
             + crate::shared::utils::estimate_token_count(&full_response);
-info!("Total tokens (context + prompt + response): {}", total_tokens);
+        info!(
+            "Total tokens (context + prompt + response): {}",
+            total_tokens
+        );
 
         // Trigger compact prompt if enabled
         let config_manager = ConfigManager::new(Arc::clone(&self.state.conn));
         let compact_enabled = config_manager
-    .get_config(&Uuid::parse_str(&message.bot_id).unwrap_or_default(), "prompt-compact", None)
+            .get_config(
+                &Uuid::parse_str(&message.bot_id).unwrap_or_default(),
+                "prompt-compact",
+                None,
+            )
             .unwrap_or_default()
             .parse::<i32>()
             .unwrap_or(0);
         if compact_enabled > 0 {
             let state = self.state.clone();
-tokio::task::spawn_blocking(move || {
-    loop {
-        if let Err(e) = tokio::runtime::Handle::current().block_on(crate::automation::execute_compact_prompt(state.clone())) {
+            tokio::task::spawn_blocking(move || loop {
+                if let Err(e) = tokio::runtime::Handle::current()
+                    .block_on(crate::automation::execute_compact_prompt(state.clone()))
+                {
                     error!("Failed to execute compact prompt: {}", e);
                 }
                 std::thread::sleep(Duration::from_secs(60));
-    }
             });
         }
 
@@ -1311,8 +1324,3 @@ async fn send_warning_handler(
 
     Ok(HttpResponse::Ok().json(serde_json::json!({"status": "warning_sent"})))
 }
-        );
-    }
-
-    Ok(HttpResponse::Ok().json(serde_json::json!({"status": "warning_sent"})))
-}