Remove storage_version column from snippets

changelogs/unreleased/fj-remove-storage-version-from-snippets.yml

+---
+title: Remove storage_version column from snippets
+merge_request: 23004
+author:
+type: changed

db/post_migrate/20200114180546_remove_storage_version_column_from_snippets.rb

+# frozen_string_literal: true
+
+class RemoveStorageVersionColumnFromSnippets < ActiveRecord::Migration[5.2]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    return unless column_exists?(:snippets, :storage_version)
+
+    remove_column :snippets, :storage_version
+  end
+
+  def down
+    add_column_with_default( # rubocop:disable Migration/AddColumnWithDefault
+      :snippets,
+      :storage_version,
+      :integer,
+      default: 2,
+      allow_null: false
+    )
+  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: 2020_01_14_113341) do
+ActiveRecord::Schema.define(version: 2020_01_14_180546) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_trgm"
@@ -3838,7 +3838,6 @@ ActiveRecord::Schema.define(version: 2020_01_14_113341) do
     t.string "encrypted_secret_token_iv", limit: 255
     t.boolean "secret", default: false, null: false
     t.string "repository_storage", limit: 255, default: "default", null: false
-    t.integer "storage_version", default: 2, null: false
     t.index ["author_id"], name: "index_snippets_on_author_id"
     t.index ["content"], name: "index_snippets_on_content_trigram", opclass: :gin_trgm_ops, using: :gin
     t.index ["created_at"], name: "index_snippets_on_created_at"