let row = sqlx::query("select exists(select true from rsstg_post where url = $1 and source_id = $2) as exists;")
			.bind(post_url)
			.bind(id.into())
			.fetch_one(&mut *self.0).await.stack()?;
		if let Some(exists) = row.try_get("exists").stack()? {
			Ok(exists)
		} else {
			bail!("Database error: can't check whether source exists.");
		}
	}

	/// Get all pending events for (now + 1 minute)
	pub async fn get_queue (&mut self) -> Result<Vec<Queue>> {
		let block: Vec<Queue> = sqlx::query_as("select source_id, next_fetch, owner, last_scrape from rsstg_order natural left join rsstg_source where next_fetch < now() + interval '1 minute';")
			.fetch_all(&mut *self.0).await.stack()?;