Improve various queries against account domains (#25126)

db/migrate/20230524190515_add_index_accounts_on_domain_and_id.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class AddIndexAccountsOnDomainAndId < ActiveRecord::Migration[6.1]
+  disable_ddl_transaction!
+
+  def change
+    add_index :accounts, [:domain, :id], name: :index_accounts_on_domain_and_id, algorithm: :concurrently
+  end
+end

db/migrate/20230524192812_fix_account_domain_casing.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class FixAccountDomainCasing < ActiveRecord::Migration[6.1]
+  disable_ddl_transaction!
+
+  def up
+    safety_assured do
+      execute 'UPDATE accounts SET domain = lower(domain) WHERE domain IS NOT NULL AND domain != lower(domain)'
+    end
+  end
+
+  def down; end
+end

db/migrate/20230524194155_add_index_instances_on_reverse_domain.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class AddIndexInstancesOnReverseDomain < ActiveRecord::Migration[6.1]
+  disable_ddl_transaction!
+
+  def change
+    add_index :instances, "reverse('.' || domain), domain", name: :index_instances_on_reverse_domain, algorithm: :concurrently
+  end
+end

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: 2023_03_30_155710) do
+ActiveRecord::Schema.define(version: 2023_05_24_194155) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -188,6 +188,7 @@ ActiveRecord::Schema.define(version: 2023_03_30_155710) do
     t.datetime "requested_review_at"
     t.index "(((setweight(to_tsvector('simple'::regconfig, (display_name)::text), 'A'::\"char\") || setweight(to_tsvector('simple'::regconfig, (username)::text), 'B'::\"char\")) || setweight(to_tsvector('simple'::regconfig, (COALESCE(domain, ''::character varying))::text), 'C'::\"char\")))", name: "search_index", using: :gin
     t.index "lower((username)::text), COALESCE(lower((domain)::text), ''::text)", name: "index_accounts_on_username_and_domain_lower", unique: true
+    t.index ["domain", "id"], name: "index_accounts_on_domain_and_id"
     t.index ["moved_to_account_id"], name: "index_accounts_on_moved_to_account_id", where: "(moved_to_account_id IS NOT NULL)"
     t.index ["uri"], name: "index_accounts_on_uri"
     t.index ["url"], name: "index_accounts_on_url", opclass: :text_pattern_ops, where: "(url IS NOT NULL)"
@@ -1283,6 +1284,7 @@ ActiveRecord::Schema.define(version: 2023_03_30_155710) do
      FROM (domain_allows
        LEFT JOIN domain_counts ON (((domain_counts.domain)::text = (domain_allows.domain)::text)));
   SQL
+  add_index "instances", "reverse(('.'::text || (domain)::text)), domain", name: "index_instances_on_reverse_domain"
   add_index "instances", ["domain"], name: "index_instances_on_domain", unique: true
 
   create_view "user_ips", sql_definition: <<-SQL