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/auth/accept.ts

@@ -80,8 +80,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				const now = new Date();
 
 				await this.accessTokensRepository.insert({
-					id: this.idService.genId(),
-					createdAt: now,
+					id: this.idService.gen(now.getTime()),
 					lastUsedAt: now,
 					appId: session.appId,
 					userId: me.id,

packages/backend/src/server/api/endpoints/auth/session/generate.ts

@@ -79,8 +79,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 			// Create session token document
 			const doc = await this.authSessionsRepository.insert({
-				id: this.idService.genId(),
-				createdAt: new Date(),
+				id: this.idService.gen(),
 				appId: app.id,
 				token: token,
 			}).then(x => this.authSessionsRepository.findOneByOrFail(x.identifiers[0]));