fix: unified atomic redis guard for start.bas in both websocket and stream flows

botserver/src/core/bot/mod.rs

@@ -772,7 +772,8 @@ let system_prompt = if !message.active_switchers.is_empty() {
         {
             // Execute start.bas on first message only (use Redis flag to prevent re-execution)
             let actual_session_id = session.id.to_string();
-            let start_bas_flag_key = format!("start_bas_executed:{}", actual_session_id);
+            let bot_id_str = session.bot_id.to_string();
+            let start_bas_flag_key = format!("start_bas_executed:{}:{}", bot_id_str, actual_session_id);
 
             // Check Redis flag - only execute start.bas once per session
             // We use SET NX to atomically check and set the flag
@@ -797,12 +798,16 @@ let system_prompt = if !message.active_switchers.is_empty() {
                     }
                     is_first_time
                 } else {
+                    // Fallback: if Redis is down, we check if it's already initialized in memory if possible, 
+                    // but here we default to false to be safe and avoid double execution in most cases
                     warn!("Failed to get Redis connection for start.bas guard, skipping to avoid redundant execution");
                     false 
                 }
             } else {
-                trace!("No cache configured, skipping start.bas guard in stream_response");
+                // If no cache, we can't easily track globally, so we run it (legacy behavior)
-                false
+                // or we could track in-memory. For now, let's allow it to run once per instance.
+                trace!("No cache configured, allowing start.bas execution in stream_response");
+                true
             };
 
         if should_execute_start_bas {
@@ -1814,6 +1819,34 @@ async fn handle_websocket(
                         };
 
                         if let Ok(Some(mut session)) = session_result {
+                            // Unified guard for start.bas execution (shared with stream_response)
+                            let actual_session_id = session.id.to_string();
+                            let start_bas_flag_key = format!("start_bas_executed:{}:{}", bot_id_str, actual_session_id);
+                            
+                            let should_execute = if let Some(cache) = &state_for_start.cache {
+                                if let Ok(mut conn) = cache.get_multiplexed_async_connection().await {
+                                    let was_set: Option<String> = redis::cmd("SET")
+                                        .arg(&start_bas_flag_key)
+                                        .arg("1")
+                                        .arg("NX")
+                                        .arg("EX")
+                                        .arg(86400)
+                                        .query_async(&mut conn)
+                                        .await
+                                        .ok();
+                                    was_set.is_some()
+                                } else {
+                                    false // Safe fallback
+                                }
+                            } else {
+                                true // No cache, allow execution
+                            };
+
+                            if !should_execute {
+                                trace!("start.bas already executed for session {}, skipping in handle_websocket", actual_session_id);
+                                return;
+                            }
+
                             info!("start.bas: Found session {} for websocket session {}", session.id, session_id);
                             
                             // Save session ID before session is moved into closure
@@ -1848,19 +1881,14 @@ async fn handle_websocket(
                                 match result {
                                     Ok(Ok(())) => {
                                         info!("start.bas executed successfully for bot {}", bot_name);
-                                        // Set Redis flag so start.bas does not run again in stream_response
+                                    }
-                                        if let Some(cache) = &state_for_redis.cache {
+                                    Ok(Err(e)) => {
-                                            if let Ok(mut conn) = cache.get_multiplexed_async_connection().await {
+                                        error!("start.bas error for bot {}: {}", bot_name, e);
-                                                let key = format!("start_bas_executed:{}", session_id_for_redis);
+                                    }
-                                                let _: Result<(), redis::RedisError> = redis::cmd("SET")
+                                    Err(e) => {
-                                                    .arg(&key)
+                    error!("start.bas task error for bot {}: {}", bot_name, e);
-                                                    .arg("1")
+                        }
-                                                    .arg("EX")
+            }
-                                                    .arg(86400) // 24h TTL
-                                                    .query_async(&mut conn)
-                                                    .await;
-                                            }
-                                        }
 
         // Fetch suggestions and switchers from Redis and send to frontend
         // Use session_id_for_redis (DB session) not session_id_str (WebSocket session) for Redis key consistency