Remove crate_downloads

No part of our code base relies on this table any longer, so we can just
remove it.

Author: sgrif

migrations/2019-03-22-170700_remove_crate_downloads/down.sql

@@ -0,0 +1,15 @@
+CREATE TABLE crate_downloads (
+  crate_id        INTEGER NOT NULL REFERENCES crates (id),
+  downloads       INTEGER NOT NULL,
+  date            DATE NOT NULL,
+  PRIMARY KEY (crate_id, date)
+);
+CREATE INDEX "index_crate_downloads_crate_id" ON crate_downloads (crate_id);
+CREATE INDEX "index_crate_downloads_date" ON crate_downloads (date);
+
+INSERT INTO crate_downloads (crate_id, downloads, date)
+  SELECT crate_id, sum(version_downloads.downloads), date
+  FROM version_downloads
+  INNER JOIN versions
+    ON version_downloads.version_id = versions.id
+  GROUP BY (crate_id, date);

migrations/2019-03-22-170700_remove_crate_downloads/up.sql

@@ -0,0 +1,3 @@
+-- ALERT! DESTRUCTIVE MIGRATION
+-- DO NOT DEPLOY UNTIL PREVIOUS COMMIT IS DEPLOYED
+DROP TABLE crate_downloads;

src/schema.patch

@@ -55,11 +55,10 @@ index df884e4..18e08cd 100644
 
      /// Representation of the `reserved_crate_names` table.
      ///
-@@ -881,22 +901,24 @@ table! {
+@@ -881,21 +901,23 @@ table! {
  }
 
  joinable!(api_tokens -> users (user_id));
- joinable!(crate_downloads -> crates (crate_id));
  joinable!(crate_owner_invitations -> crates (crate_id));
  joinable!(crate_owners -> crates (crate_id));
 -joinable!(crate_owners -> users (created_by));

src/schema.rs

@@ -176,35 +176,6 @@ table! {
     }
 }
 
-table! {
-    use diesel::sql_types::*;
-    use diesel_full_text_search::{TsVector as Tsvector};
-
-    /// Representation of the `crate_downloads` table.
-    ///
-    /// (Automatically generated by Diesel.)
-    crate_downloads (crate_id, date) {
-        /// The `crate_id` column of the `crate_downloads` table.
-        ///
-        /// Its SQL type is `Int4`.
-        ///
-        /// (Automatically generated by Diesel.)
-        crate_id -> Int4,
-        /// The `downloads` column of the `crate_downloads` table.
-        ///
-        /// Its SQL type is `Int4`.
-        ///
-        /// (Automatically generated by Diesel.)
-        downloads -> Int4,
-        /// The `date` column of the `crate_downloads` table.
-        ///
-        /// Its SQL type is `Date`.
-        ///
-        /// (Automatically generated by Diesel.)
-        date -> Date,
-    }
-}
-
 table! {
     use diesel::sql_types::*;
     use diesel_full_text_search::{TsVector as Tsvector};
@@ -956,7 +927,6 @@ table! {
 }
 
 joinable!(api_tokens -> users (user_id));
-joinable!(crate_downloads -> crates (crate_id));
 joinable!(crate_owner_invitations -> crates (crate_id));
 joinable!(crate_owners -> crates (crate_id));
 joinable!(crate_owners -> teams (owner_id));
@@ -984,7 +954,6 @@ allow_tables_to_appear_in_same_query!(
     background_jobs,
     badges,
     categories,
-    crate_downloads,
     crate_owner_invitations,
     crate_owners,
     crates,