Remove deprecated cache columns

priv/repo/cache/migrations/20170713020139_initial_migration.exs

@@ -5,16 +5,16 @@ defmodule Helix.Cache.Repo.Migrations.InitialMigration do
 
     create table(:server_cache, primary_key: false) do
       add :server_id, :inet, primary_key: true
-      add :entity_id, :inet
-      add :motherboard_id, :inet
+      add :entity_id, :inet  # removed
+      add :motherboard_id, :inet  # removed
       add :networks, {:array, :json}
       add :storages, {:array, :inet}
-      add :resources, :map
-      add :components, {:array, :inet}
+      add :resources, :map  # removed
+      add :components, {:array, :inet}  # removed
       add :expiration_date, :utc_datetime
     end
-    create index(:server_cache, [:entity_id])
-    create index(:server_cache, [:motherboard_id])
+    create index(:server_cache, [:entity_id])  # removed
+    create index(:server_cache, [:motherboard_id])  # removed
     create index(:server_cache, [:expiration_date])
 
     create table(:storage_cache, primary_key: false) do
@@ -32,12 +32,12 @@ defmodule Helix.Cache.Repo.Migrations.InitialMigration do
     end
     create index(:network_cache, [:expiration_date])
 
-    create table(:component_cache, primary_key: false) do
-      add :component_id, :inet, primary_key: true
-      add :motherboard_id, :inet
-      add :expiration_date, :utc_datetime
-    end
-    create index(:component_cache, [:expiration_date])
+    create table(:component_cache, primary_key: false) do  # removed
+      add :component_id, :inet, primary_key: true  # removed
+      add :motherboard_id, :inet  # removed
+      add :expiration_date, :utc_datetime  # removed
+    end  # removed
+    create index(:component_cache, [:expiration_date])  # removed
 
     create table(:web_cache, primary_key: false) do
       add :network_id, :inet, primary_key: true

priv/repo/cache/migrations/20171223112419_remove_deprecated_cache_columns.exs

@@ -0,0 +1,16 @@
+defmodule Helix.Cache.Repo.Migrations.RemoveDeprecatedCacheColumns do
+  use Ecto.Migration
+
+  def change do
+    drop index(:server_cache, [:entity_id])
+    drop index(:server_cache, [:motherboard_id])
+    alter table(:server_cache, primary_key: false) do
+      remove :entity_id
+      remove :motherboard_id
+      remove :resources
+      remove :components
+    end
+
+    drop table(:component_cache)
+  end
+end