Index changeset comments by changeset and date

db/migrate/20201006220807_add_changeset_index_to_changeset_comments.rb

@@ -0,0 +1,8 @@
+class AddChangesetIndexToChangesetComments < ActiveRecord::Migration[6.0]
+  disable_ddl_transaction!
+
+  def change
+    remove_index :changeset_comments, [:author_id, :created_at]
+    add_index :changeset_comments, [:changeset_id, :created_at], :algorithm => :concurrently
+  end
+end

db/structure.sql

@@ -1,5 +1,6 @@
 SET statement_timeout = 0;
 SET lock_timeout = 0;
+SET idle_in_transaction_session_timeout = 0;
 SET client_encoding = 'UTF8';
 SET standard_conforming_strings = on;
 SELECT pg_catalog.set_config('search_path', '', false);
@@ -8,20 +9,6 @@ SET xmloption = content;
 SET client_min_messages = warning;
 SET row_security = off;
 
---
--- Name: plpgsql; Type: EXTENSION; Schema: -; Owner: -
---
-
-CREATE EXTENSION IF NOT EXISTS plpgsql WITH SCHEMA pg_catalog;
-
-
---
--- Name: EXTENSION plpgsql; Type: COMMENT; Schema: -; Owner: -
---
-
-COMMENT ON EXTENSION plpgsql IS 'PL/pgSQL procedural language';
-
-
 --
 -- Name: btree_gist; Type: EXTENSION; Schema: -; Owner: -
 --
@@ -190,7 +177,7 @@ $$;
 --
 
 CREATE FUNCTION public.xid_to_int4(t xid) RETURNS integer
-    LANGUAGE plpgsql STRICT
+    LANGUAGE plpgsql IMMUTABLE STRICT
     AS $$
 DECLARE
   tl bigint;
@@ -211,7 +198,7 @@ $$;
 
 SET default_tablespace = '';
 
-SET default_with_oids = false;
+SET default_table_access_method = heap;
 
 --
 -- Name: acls; Type: TABLE; Schema: public; Owner: -
@@ -321,8 +308,8 @@ ALTER SEQUENCE public.active_storage_blobs_id_seq OWNED BY public.active_storage
 CREATE TABLE public.ar_internal_metadata (
     key character varying NOT NULL,
     value character varying,
-    created_at timestamp(6) without time zone NOT NULL,
+    created_at timestamp without time zone NOT NULL,
-    updated_at timestamp(6) without time zone NOT NULL
+    updated_at timestamp without time zone NOT NULL
 );
 
 
@@ -1322,9 +1309,9 @@ CREATE TABLE public.user_preferences (
 CREATE TABLE public.user_roles (
     id integer NOT NULL,
     user_id bigint NOT NULL,
-    role public.user_role_enum NOT NULL,
     created_at timestamp without time zone,
     updated_at timestamp without time zone,
+    role public.user_role_enum NOT NULL,
     granter_id bigint NOT NULL
 );
 
@@ -2256,10 +2243,10 @@ CREATE UNIQUE INDEX index_active_storage_blobs_on_key ON public.active_storage_b
 
 
 --
--- Name: index_changeset_comments_on_author_id_and_created_at; Type: INDEX; Schema: public; Owner: -
+-- Name: index_changeset_comments_on_changeset_id_and_created_at; Type: INDEX; Schema: public; Owner: -
 --
 
-CREATE INDEX index_changeset_comments_on_author_id_and_created_at ON public.changeset_comments USING btree (author_id, created_at);
+CREATE INDEX index_changeset_comments_on_changeset_id_and_created_at ON public.changeset_comments USING btree (changeset_id, created_at);
 
 
 --
@@ -3146,6 +3133,7 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20190716173946'),
 ('20191120140058'),
 ('20201006213836'),
+('20201006220807'),
 ('21'),
 ('22'),
 ('23'),