diff --git a/app/api/dashboard/export/route.ts b/app/api/dashboard/export/route.ts
index 5558420..49f2d9e 100644
--- a/app/api/dashboard/export/route.ts
+++ b/app/api/dashboard/export/route.ts
@@ -31,6 +31,7 @@ export async function GET(request: NextRequest) {
       sites (name), zones (name)
     `)
     .order('reported_at', { ascending: false })
+    .limit(10000)
 
   const rows = incidents ?? []
 
@@ -58,7 +59,15 @@ export async function GET(request: NextRequest) {
   })
 
   const csv = rowsToCsv(headers, csvRows)
-  const filename = `incidents-${role}-${new Date().toISOString().split('T')[0]}.csv`
+  const safeRole = role.replace(/[^a-z0-9]/gi, '')
+  const filename = `incidents-${safeRole}-${new Date().toISOString().split('T')[0]}.csv`
+
+  await supabase.rpc('write_audit_log', {
+    p_table_name: 'incidents',
+    p_record_id: user.id,
+    p_action: 'export_csv',
+    p_new_value: { role, row_count: rows.length } as never,
+  })
 
   return new NextResponse(csv, {
     status: 200,
diff --git a/app/api/dashboard/stats/route.ts b/app/api/dashboard/stats/route.ts
index 67e1843..0c03377 100644
--- a/app/api/dashboard/stats/route.ts
+++ b/app/api/dashboard/stats/route.ts
@@ -15,6 +15,7 @@ export async function GET() {
   const { data: incidents, error } = await supabase
     .from('incidents')
     .select('id, status, incident_type, sites (name)')
+    .limit(10000)
 
   if (error) return NextResponse.json({ error: 'Failed to fetch stats' }, { status: 500 })
 
diff --git a/app/api/settings/route.ts b/app/api/settings/route.ts
index 08f1aaa..7d25500 100644
--- a/app/api/settings/route.ts
+++ b/app/api/settings/route.ts
@@ -47,8 +47,8 @@ export async function POST(request: NextRequest) {
   if (!body.key || !ALLOWED_KEYS.includes(body.key as SettingKey)) {
     return NextResponse.json({ error: 'Invalid key' }, { status: 422 })
   }
-  if (typeof body.value !== 'string') {
-    return NextResponse.json({ error: 'value required' }, { status: 422 })
+  if (typeof body.value !== 'string' || body.value.trim() === '') {
+    return NextResponse.json({ error: 'value must be a non-empty string' }, { status: 422 })
   }
 
   const { error } = await supabase.from('app_settings').upsert({