Problem

In useAgentDetailData.ts and useAgentsData.ts, every WebSocket message on the subscribed channels triggers a full data refetch. During event bursts (e.g., batch agent updates), this fires many parallel API calls with no debouncing or deduplication.

Additionally, overlapping fetches from WS events and polling can race, with older responses overwriting newer ones since set() is unconditional.

Proposed fix

• Debounce the WebSocket handler (e.g., 300ms) to coalesce burst events into a single refetch
• Consider using a generation counter in the store to discard stale responses from concurrent fetches

Files

• web/src/hooks/useAgentDetailData.ts (lines 66-74)
• web/src/hooks/useAgentsData.ts (lines 51-60)

Found during PR #874 review (silent-failure-hunter agent).