🩹 make previous data href nullable to fix dashboard (#109)

Author: woohm402

src/entities/Waffle.ts

@@ -4,6 +4,6 @@ export type Log = {
   from: SlackID;
   to: SlackID;
   count: number;
-  href: string;
+  href: string | null;
   date: Date;
 };

src/infrastructures/implementMongoAtlasWaffleRepository.ts

@@ -26,7 +26,7 @@ export const implementMongoAtlasWaffleRepository = ({
         from: z.string(),
         to: z.string(),
         count: z.number(),
-        href: z.string(),
+        href: z.string().nullable(),
         date: z.date(),
       });
       return {
@@ -41,7 +41,7 @@ export const implementMongoAtlasWaffleRepository = ({
         from: z.string(),
         to: z.string(),
         count: z.number(),
-        href: z.string(),
+        href: z.string().nullable(),
         date: z.date(),
       });
       return {