[Feat]: 투표 참여 엔티티 userHash 필드 제거 및 유니크 제약조건 삭제

Author: shihan00321

back/src/main/java/com/back/domain/poll/entity/PollVote.java

@@ -20,8 +20,7 @@
 @Entity
 @Table(name = "poll_votes",
     uniqueConstraints = {
-        @UniqueConstraint(name = "uq_logged_in_once", columnNames = {"post_id", "pollUid", "user_id"}),
-        @UniqueConstraint(name = "uq_anonymous_once", columnNames = {"post_id", "pollUid", "userHash"})
+        @UniqueConstraint(name = "uq_logged_in_once", columnNames = {"post_id", "pollUid", "user_id"})
     }
 )
 @Getter
@@ -41,9 +40,6 @@ public class PollVote extends BaseEntity {
     @JoinColumn(name = "user_id")
     private User user;
 
-    @Column(length = 128)
-    private String userHash;
-
     @JdbcTypeCode(SqlTypes.JSON)
     @Column(nullable = false, columnDefinition = "jsonb")
     private String choiceJson;