public function jsonSerialize()
    {
        return [
            'id' => $this->id,
            'sequence' => $this->sequence,
            'batch_id' => $this->batchId,
            'type' => $this->type,
            'content' => $this->content,
            'tags' => $this->tags,
            'family_hash' => $this->familyHash,
            'created_at' => $this->createdAt->toDateTimeString(),
        ];
    }