Update compare parameter to use enum for valid values

src/app/api/websites/[websiteId]/stats/route.ts

@@ -31,7 +31,7 @@ export async function GET(
 
   const data = await getWebsiteStats(websiteId, filters);
 
-  const compare = filters.compare === 'yoy' ? 'yoy' : 'prev';
+  const compare = filters.compare ?? 'prev';
 
   const { startDate, endDate } = getCompareDate(compare, filters.startDate, filters.endDate);
 

src/lib/schema.ts

@@ -20,7 +20,7 @@ export const dateRangeParams = {
   endDate: z.coerce.date().optional(),
   timezone: timezoneParam.optional(),
   unit: unitParam.optional(),
-  compare: z.string().optional(),
+  compare: z.enum(['prev', 'yoy']).optional(),
 };
 
 export const filterParams = {