fix(billing): deterministic apportionment order, block audit export during stale data

Cursor Bugbot caught two more real issues on the latest push:

1. Same stale-export bug as the earlier Credit usage fix, this time in
   Audit Logs: Export stayed enabled while useAuditLogs held prior
   rows via keepPreviousData, so it could export against a
   just-changed filter while the table still showed the old one. Now
   also disabled while isPlaceholderData is true.

2. getUsageCreditsByLogId had no ORDER BY before apportionCredits's
   largest-remainder tie-break, so which row absorbed a tied
   remainder credit depended on undefined Postgres row order — the
   same event's displayed credit could flip between calls (list vs.
   export, or even two successive requests). Added the same
   `orderBy(desc(createdAt), desc(id))` the main list query already
   uses, making the tie-break reproducible.

Verified live: 3 identically-costed rows produced the same tie-break
winner across 3 repeated requests (previously order-dependent).

Author: waleedlatif1

apps/sim/ee/audit-logs/components/audit-logs.tsx

@@ -297,8 +297,15 @@ export function AuditLogs() {
     }
   }, [debouncedSearch, selectedTypes, timeRange, customStartDate, customEndDate])
 
-  const { data, isLoading, isFetchingNextPage, hasNextPage, fetchNextPage, refetch } =
-    useAuditLogs(filters)
+  const {
+    data,
+    isLoading,
+    isPlaceholderData,
+    isFetchingNextPage,
+    hasNextPage,
+    fetchNextPage,
+    refetch,
+  } = useAuditLogs(filters)
 
   const allEntries = useMemo(() => {
     if (!data?.pages) return []
@@ -403,7 +410,7 @@ export function AuditLogs() {
           text: 'Export',
           icon: Download,
           onSelect: () => void handleExportCsv(),
-          disabled: allEntries.length === 0 || isExporting,
+          disabled: allEntries.length === 0 || isExporting || isPlaceholderData,
         },
       ]}
     >

apps/sim/lib/billing/core/usage-log.ts

@@ -550,6 +550,7 @@ export async function getUsageCreditsByLogId(
     .select({ id: usageLog.id, cost: usageLog.cost })
     .from(usageLog)
     .where(and(...buildUsageLogConditions(userId, filter)))
+    .orderBy(desc(usageLog.createdAt), desc(usageLog.id))
 
   return apportionCredits(
     rows.map((row) => ({ key: row.id, dollars: Number.parseFloat(row.cost) }))