fix performance regression in all releases-views

Author: syphar

src/db/migrate.rs

@@ -602,6 +602,17 @@ pub fn migrate(version: Option<Version>, conn: &mut Client) -> CratesfyiResult<(
                     ALTER release_time TYPE timestamp USING release_time AT TIME ZONE 'UTC';
             ",
         ),
+        migration!(
+            context, 
+            26, 
+            "create index for crates.latest_version_id",
+            // upgrade
+            "
+            CREATE INDEX crates_latest_version_idx ON crates (latest_version_id);
+            ANALYZE crates;
+            ",
+            "DROP INDEX crates_latest_version_idx;",
+        ),
     ];
 
     for migration in migrations {

src/web/releases.rs

@@ -84,11 +84,10 @@ pub(crate) fn get_releases(conn: &mut Client, page: i64, limit: i64, order: Orde
             releases.rustdoc_status,
             github_repos.stars
         FROM crates
-        INNER JOIN releases ON crates.id = releases.crate_id
+        INNER JOIN releases ON crates.latest_version_id = releases.id
         LEFT JOIN github_repos ON releases.github_repo = github_repos.id
         WHERE
             ((NOT $3) OR (releases.build_status = FALSE AND releases.is_library = TRUE))
-            AND crates.latest_version_id = releases.id
         ORDER BY {} DESC NULLS LAST
         LIMIT $1 OFFSET $2",
         ordering,