Further improve the media attached status query for accounts (#16106)

2 files changed, 15 insertions, 2 deletions

diff --git a/db/migrate/20210425135952_add_index_on_media_attachments_account_id_status_id.rb b/db/migrate/20210425135952_add_index_on_media_attachments_account_id_status_id.rb
new file mode 100644
index 000000000..5ef2d3c39
--- /dev/null
+++ b/db/migrate/20210425135952_add_index_on_media_attachments_account_id_status_id.rb
@@ -0,0 +1,13 @@
+class AddIndexOnMediaAttachmentsAccountIdStatusId < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def up
+    add_index :media_attachments, [:account_id, :status_id], order: { status_id: :desc }, algorithm: :concurrently
+    remove_index :media_attachments, :account_id, algorithm: :concurrently
+  end
+
+  def down
+    add_index :media_attachments, :account_id, algorithm: :concurrently
+    remove_index :media_attachments, [:account_id, :status_id], order: { status_id: :desc }, algorithm: :concurrently
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 8dc0661fc..0d951ee95 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2021_04_21_121431) do
+ActiveRecord::Schema.define(version: 2021_04_25_135952) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -541,7 +541,7 @@ ActiveRecord::Schema.define(version: 2021_04_21_121431) do
     t.integer "thumbnail_file_size"
     t.datetime "thumbnail_updated_at"
     t.string "thumbnail_remote_url"
-    t.index ["account_id"], name: "index_media_attachments_on_account_id"
+    t.index ["account_id", "status_id"], name: "index_media_attachments_on_account_id_and_status_id", order: { status_id: :desc }
     t.index ["scheduled_status_id"], name: "index_media_attachments_on_scheduled_status_id"
     t.index ["shortcode"], name: "index_media_attachments_on_shortcode", unique: true
     t.index ["status_id"], name: "index_media_attachments_on_status_id"