Add Index for pagination cursor

priv/repo/migrations/20201211030926_create_users.exs

@@ -8,6 +8,7 @@ defmodule Diskuy.Repo.Migrations.CreateUsers do
       add :picture, :string
       timestamps()
     end
+    create index(:users, [:id, :inserted_at])
     create unique_index(:users, [:username])
     create unique_index(:users, [:email])
   end

priv/repo/migrations/20201211032933_create_topics.exs

@@ -7,6 +7,7 @@ defmodule Diskuy.Repo.Migrations.CreateTopics do
       timestamps()
     end
 
+    create index(:topics, [:id, :inserted_at])
     create unique_index(:topics, [:name])
   end
 end

priv/repo/migrations/20201211041307_create_threads.exs

@@ -14,6 +14,7 @@ defmodule Diskuy.Repo.Migrations.CreateThreads do
 
     create index(:threads, [:topic_id])
     create index(:threads, [:user_id])
+    create index(:threads, [:id, :inserted_at])
     create unique_index(:threads, [:title, :topic_id], name: :title_in_topic_unique)
   end
 end

priv/repo/migrations/20201211055930_create_posts.exs

@@ -12,6 +12,7 @@ defmodule Diskuy.Repo.Migrations.CreatePosts do
       timestamps()
     end
 
+    create index(:posts, [:id, :inserted_at])
     create index(:posts, [:thread_id])
     create index(:posts, [:user_id])
   end