enhance(server): アンケート選択肢の文字数制限を緩和

Resolve #9511

packages/backend/migration/1673336077243-PollChoiceLength.js

@@ -0,0 +1,11 @@
+export class PollChoiceLength1673336077243 {
+    name = 'PollChoiceLength1673336077243'
+
+    async up(queryRunner) {
+				await queryRunner.query(`ALTER TABLE "poll" ALTER COLUMN "choices" TYPE character varying(256) array`);
+    }
+
+    async down(queryRunner) {
+			await queryRunner.query(`ALTER TABLE "poll" ALTER COLUMN "choices" TYPE character varying(128) array`);
+    }
+}

packages/backend/src/models/entities/Poll.ts

@@ -24,7 +24,7 @@ export class Poll {
 	public multiple: boolean;
 
 	@Column('varchar', {
-		length: 128, array: true, default: '{}',
+		length: 256, array: true, default: '{}',
 	})
 	public choices: string[];