Make migration scripts

and use createdAt instead of _id

src/models/followed-log.ts

@@ -6,6 +6,7 @@ export default FollowedLog;
 
 export type IFollowedLog = {
 	_id: ObjectID;
+	createdAt: Date;
 	userId: ObjectID;
 	count: number;
 };

src/models/following-log.ts

@@ -6,6 +6,7 @@ export default FollowingLog;
 
 export type IFollowingLog = {
 	_id: ObjectID;
+	createdAt: Date;
 	userId: ObjectID;
 	count: number;
 };