ype: Schema.Types.ObjectId, require: true, ref: 'User' },
question: { type: Schema.Types.ObjectId, require: true, ref: 'Question' },
upvotes: [{ type: Schema.Types.ObjectId, ref: 'User' }],
downvotes: [{ type: Schema.Types.ObjectId, ref: 'User' }],
content: { type: String, require: true },
createdAt: { type: Date, default: Date.now },
});