improve indexes

priv/repo/migrations/20221119170815_add_more_indexes.exs

@@ -0,0 +1,16 @@
+defmodule Cannery.Repo.Migrations.AddMoreIndexes do
+  use Ecto.Migration
+
+  def change do
+    create unique_index(:container_tags, [:tag_id, :container_id])
+
+    create index(:ammo_groups, [:user_id], where: "count = 0", name: :empty_ammo_groups_index)
+    create index(:ammo_groups, [:user_id, :ammo_type_id])
+    create index(:ammo_groups, [:user_id, :container_id])
+
+    create index(:ammo_types, [:user_id])
+
+    drop index(:shot_groups, [:id])
+    create index(:shot_groups, [:user_id, :ammo_group_id])
+  end
+end