fix(logs): instant log detail panel with initialData and hover prefetch

apps/sim/app/workspace/[workspaceId]/logs/components/logs-list/logs-list.tsx

@@ -24,6 +24,7 @@ interface LogRowProps {
   log: WorkflowLog
   isSelected: boolean
   onClick: (log: WorkflowLog) => void
+  onHover?: (log: WorkflowLog) => void
   onContextMenu?: (e: React.MouseEvent, log: WorkflowLog) => void
   selectedRowRef: React.RefObject<HTMLTableRowElement | null> | null
 }
@@ -33,7 +34,14 @@ interface LogRowProps {
  * Uses shallow comparison for the log object.
  */
 const LogRow = memo(
-  function LogRow({ log, isSelected, onClick, onContextMenu, selectedRowRef }: LogRowProps) {
+  function LogRow({
+    log,
+    isSelected,
+    onClick,
+    onHover,
+    onContextMenu,
+    selectedRowRef,
+  }: LogRowProps) {
     const formattedDate = useMemo(() => formatDate(log.createdAt), [log.createdAt])
     const isDeletedWorkflow = !log.workflow?.id && !log.workflowId
     const workflowName = isDeletedWorkflow
@@ -43,6 +51,8 @@ const LogRow = memo(
 
     const handleClick = useCallback(() => onClick(log), [onClick, log])
 
+    const handleMouseEnter = useCallback(() => onHover?.(log), [onHover, log])
+
     const handleContextMenu = useCallback(
       (e: React.MouseEvent) => {
         if (onContextMenu) {
@@ -61,6 +71,7 @@ const LogRow = memo(
           isSelected && 'bg-[var(--surface-3)] dark:bg-[var(--surface-4)]'
         )}
         onClick={handleClick}
+        onMouseEnter={handleMouseEnter}
         onContextMenu={handleContextMenu}
       >
         <div className='flex flex-1 items-center'>
@@ -142,7 +153,8 @@ const LogRow = memo(
       prevProps.log.id === nextProps.log.id &&
       prevProps.log.duration === nextProps.log.duration &&
       prevProps.log.status === nextProps.log.status &&
-      prevProps.isSelected === nextProps.isSelected
+      prevProps.isSelected === nextProps.isSelected &&
+      prevProps.onHover === nextProps.onHover
     )
   }
 )
@@ -151,6 +163,7 @@ interface RowProps {
   logs: WorkflowLog[]
   selectedLogId: string | null
   onLogClick: (log: WorkflowLog) => void
+  onLogHover?: (log: WorkflowLog) => void
   onLogContextMenu?: (e: React.MouseEvent, log: WorkflowLog) => void
   selectedRowRef: React.RefObject<HTMLTableRowElement | null>
   isFetchingNextPage: boolean
@@ -167,6 +180,7 @@ function Row({
   logs,
   selectedLogId,
   onLogClick,
+  onLogHover,
   onLogContextMenu,
   selectedRowRef,
   isFetchingNextPage,
@@ -198,6 +212,7 @@ function Row({
         log={log}
         isSelected={isSelected}
         onClick={onLogClick}
+        onHover={onLogHover}
         onContextMenu={onLogContextMenu}
         selectedRowRef={isSelected ? selectedRowRef : null}
       />
@@ -209,6 +224,7 @@ export interface LogsListProps {
   logs: WorkflowLog[]
   selectedLogId: string | null
   onLogClick: (log: WorkflowLog) => void
+  onLogHover?: (log: WorkflowLog) => void
   onLogContextMenu?: (e: React.MouseEvent, log: WorkflowLog) => void
   selectedRowRef: React.RefObject<HTMLTableRowElement | null>
   hasNextPage: boolean
@@ -227,6 +243,7 @@ export function LogsList({
   logs,
   selectedLogId,
   onLogClick,
+  onLogHover,
   onLogContextMenu,
   selectedRowRef,
   hasNextPage,
@@ -272,6 +289,7 @@ export function LogsList({
       logs,
       selectedLogId,
       onLogClick,
+      onLogHover,
       onLogContextMenu,
       selectedRowRef,
       isFetchingNextPage,
@@ -281,6 +299,7 @@ export function LogsList({
       logs,
       selectedLogId,
       onLogClick,
+      onLogHover,
       onLogContextMenu,
       selectedRowRef,
       isFetchingNextPage,

apps/sim/app/workspace/[workspaceId]/logs/logs.tsx

@@ -1,6 +1,7 @@
 'use client'
 
 import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
+import { useQueryClient } from '@tanstack/react-query'
 import { Loader2 } from 'lucide-react'
 import { useParams } from 'next/navigation'
 import { cn } from '@/lib/core/utils/cn'
@@ -11,7 +12,12 @@ import {
 } from '@/lib/logs/filters'
 import { parseQuery, queryToApiParams } from '@/lib/logs/query-parser'
 import { useFolders } from '@/hooks/queries/folders'
-import { useDashboardStats, useLogDetail, useLogsList } from '@/hooks/queries/logs'
+import {
+  prefetchLogDetail,
+  useDashboardStats,
+  useLogDetail,
+  useLogsList,
+} from '@/hooks/queries/logs'
 import { useDebounce } from '@/hooks/use-debounce'
 import { useFilterStore } from '@/stores/logs/filters/store'
 import type { WorkflowLog } from '@/stores/logs/filters/types'
@@ -94,8 +100,19 @@ export default function Logs() {
   const [previewLogId, setPreviewLogId] = useState<string | null>(null)
 
   const activeLogId = isPreviewOpen ? previewLogId : selectedLogId
+  const queryClient = useQueryClient()
+
+  const detailRefetchInterval = useCallback(
+    (query: { state: { data?: WorkflowLog } }) => {
+      if (!isLive) return false
+      const status = query.state.data?.status
+      return status === 'running' || status === 'pending' ? 3000 : false
+    },
+    [isLive]
+  )
+
   const activeLogQuery = useLogDetail(activeLogId ?? undefined, {
-    refetchInterval: isLive ? 3000 : false,
+    refetchInterval: detailRefetchInterval,
   })
 
   const logFilters = useMemo(
@@ -154,6 +171,13 @@ export default function Logs() {
     return { ...selectedLogFromList, ...activeLogQuery.data }
   }, [selectedLogFromList, activeLogQuery.data, isPreviewOpen])
 
+  const handleLogHover = useCallback(
+    (log: WorkflowLog) => {
+      prefetchLogDetail(queryClient, log.id)
+    },
+    [queryClient]
+  )
+
   useFolders(workspaceId)
 
   useEffect(() => {
@@ -476,6 +500,7 @@ export default function Logs() {
                     logs={logs}
                     selectedLogId={selectedLogId}
                     onLogClick={handleLogClick}
+                    onLogHover={handleLogHover}
                     onLogContextMenu={handleLogContextMenu}
                     selectedRowRef={selectedRowRef}
                     hasNextPage={logsQuery.hasNextPage ?? false}

apps/sim/hooks/queries/logs.ts

@@ -1,4 +1,10 @@
-import { keepPreviousData, useInfiniteQuery, useQuery } from '@tanstack/react-query'
+import {
+  keepPreviousData,
+  type QueryClient,
+  useInfiniteQuery,
+  useQuery,
+  useQueryClient,
+} from '@tanstack/react-query'
 import { getEndDateFromTimeRange, getStartDateFromTimeRange } from '@/lib/logs/filters'
 import { parseQuery, queryToApiParams } from '@/lib/logs/query-parser'
 import type {
@@ -146,17 +152,45 @@ export function useLogsList(
 
 interface UseLogDetailOptions {
   enabled?: boolean
-  refetchInterval?: number | false
+  refetchInterval?:
+    | number
+    | false
+    | ((query: { state: { data?: WorkflowLog } }) => number | false | undefined)
 }
 
 export function useLogDetail(logId: string | undefined, options?: UseLogDetailOptions) {
+  const queryClient = useQueryClient()
   return useQuery({
     queryKey: logKeys.detail(logId),
     queryFn: () => fetchLogDetail(logId as string),
     enabled: Boolean(logId) && (options?.enabled ?? true),
     refetchInterval: options?.refetchInterval ?? false,
     staleTime: 30 * 1000,
-    placeholderData: keepPreviousData,
+    initialData: () => {
+      if (!logId) return undefined
+      const listQueries = queryClient.getQueriesData<{
+        pages: { logs: WorkflowLog[] }[]
+      }>({
+        queryKey: logKeys.lists(),
+      })
+      for (const [, data] of listQueries) {
+        const match = data?.pages?.flatMap((p) => p.logs).find((l) => l.id === logId)
+        if (match) return match
+      }
+      return undefined
+    },
+    initialDataUpdatedAt: 0,
+  })
+}
+
+/**
+ * Prefetches log detail data on hover for instant panel rendering on click.
+ */
+export function prefetchLogDetail(queryClient: QueryClient, logId: string) {
+  queryClient.prefetchQuery({
+    queryKey: logKeys.detail(logId),
+    queryFn: () => fetchLogDetail(logId),
+    staleTime: 30 * 1000,
   })
 }