Ignore: 🐛 Add "Is Null" Filter on the Foreign Entity in the Chat Room Entity

[psychology50]

작업 이유

• The reason why leaving a chat room fails is due to an issue in the hasOnlyAdmin() method.
• When Hibernate.size() is called, it doesn't account for soft-deleted data, causing incorrect behavior.

작업 사항

public class ChatRoom extends DateAuditable {
    ...

    @OneToMany(mappedBy = "chatRoom")
    @SQLRestriction("deleted_at IS NULL") // Added filter for soft deletion
    private List<ChatMember> chatMembers = new ArrayList<>();

• Although I dislike using @SQLRestriction, it seems acceptable in this case due to its limited scope.

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발견한 이슈

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