Method delete_topic

backend/src/graphql/mutation.rs:335–355

(
        &self,
        ctx: &Context<'_>,
        input: DeleteTopicInput,
    )

    }

    async fn delete_topic(
        &self,
        ctx: &Context<'_>,
        input: DeleteTopicInput,
    ) -> Result<DeleteTopicPayload> {
        let DeleteTopicInput {
            client_mutation_id,
            repo_id,
            topic_id,
        } = input;
        let topic_id = ExternalId::try_from(&topic_id)?;

        ctx.data_unchecked::<Store>()
            .delete_topic(repo_id.try_into()?, &topic_id)
            .await?;

        Ok(DeleteTopicPayload {
            client_mutation_id,
            deleted_topic_id: topic_id.to_string(),
        })
    }

    async fn remove_topic_timerange(
        &self,