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69f85a4dce
Three bugs causing intermittent silent drops, partial responses, and flood control delays on the Telegram platform: 1. Race condition in handle_message() — _active_sessions was set inside the background task, not before create_task(). Two rapid messages could both pass the guard and spawn duplicate processing tasks. Fix: set _active_sessions synchronously before spawning the task (grammY sequentialize / aiogram EventIsolation pattern). 2. Photo media loss on dequeue — when a photo (no caption) was queued during active processing and later dequeued, only .text was extracted. Empty text → message silently dropped. Fix: _build_media_placeholder() creates text context for media-only events so they survive the dequeue path. 3. Progress message edits triggered Telegram flood control — rapid tool calls edited the progress message every 0.3s, hitting Telegram's rate limit (23s+ waits). This blocked progress updates and could cause stream consumer timeouts. Fix: throttle edits to 1.5s minimum interval, detect flood control errors and gracefully degrade to new messages. edit_message() now returns failure for flood waits >5s instead of blocking.