feat: seperate single and multi choice questions

src/migrations/1786856474000-MultiChoiceTransitionUnqIndex.ts

@@ -0,0 +1,26 @@
+import { UNIQUE_QUESTION_MULTI_CHOICE } from '@/modules/questions/constants';
+import { QuestionTransitionType } from '@/modules/questions/enums/question-transition-type.enum';
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+export class MultiChoiceTransitionUniqueIndex1786856474000 implements MigrationInterface {
+  name = 'AddMultiChoiceTransitionUniqueIndex1750000000000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      CREATE UNIQUE INDEX ${UNIQUE_QUESTION_MULTI_CHOICE}
+      ON "question_transition" (
+        "fromQuestionId",
+        "type",
+        (("condition" ->> 'operator')),
+        (("condition" -> 'choiceIds'))
+      )
+      WHERE "type" = '${QuestionTransitionType.MULTI_CHOICE}'
+    `);
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      DROP INDEX ${UNIQUE_QUESTION_MULTI_CHOICE}
+    `);
+  }
+}