Query optimization (#235)

* Optimize version queries and decrease some query complexity

* Run formatter

src/database/models/mod.rs

@@ -38,28 +38,6 @@ pub enum DatabaseError {
     Other(String),
 }
 
-impl ids::ChannelId {
-    pub async fn get_id<'a, E>(
-        channel: &str,
-        exec: E,
-    ) -> Result<Option<ids::ChannelId>, DatabaseError>
-    where
-        E: sqlx::Executor<'a, Database = sqlx::Postgres>,
-    {
-        let result = sqlx::query!(
-            "
-            SELECT id FROM release_channels
-            WHERE channel = $1
-            ",
-            channel
-        )
-        .fetch_optional(exec)
-        .await?;
-
-        Ok(result.map(|r| ids::ChannelId(r.id)))
-    }
-}
-
 impl ids::StatusId {
     pub async fn get_id<'a, E>(
         status: &crate::models::projects::ProjectStatus,