perf(backend): createdAtをidから取得するように & 無駄なDateインスタンスの生成を避けるように

packages/backend/src/server/api/endpoints/notes/polls/recommendation.ts

@@ -98,7 +98,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 					id: In(polls.map(poll => poll.noteId)),
 				},
 				order: {
-					createdAt: 'DESC',
+					id: 'DESC',
 				},
 			});
 

packages/backend/src/server/api/endpoints/notes/polls/vote.ts

@@ -145,8 +145,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 			// Create vote
 			const vote = await this.pollVotesRepository.insert({
-				id: this.idService.genId(),
-				createdAt,
+				id: this.idService.gen(createdAt.getTime()),
 				noteId: note.id,
 				userId: me.id,
 				choice: ps.choice,