Migrate lfs_object_registry to new format

* In order to migrate LFS replication to use the Geo self service
  framework, we need to migrate to use Geo::ReplicableRegistry. These
migrations will put the lfs_object_registry table in the appropriate
format for migrating to the new registry.

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/52636

ee/changelogs/unreleased/276694-migrate-lfs_object_registry-to-use-geo-replicableregistry.yml

+---
+title: Migrate lfs_object_registry to be compatible with Geo::ReplicableRegistry
+merge_request: 52636
+author:
+type: changed

ee/db/geo/post_migrate/20210120225014_migrate_lfs_object_registry.rb

+# frozen_string_literal: true
+
+class MigrateLfsObjectRegistry < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  def up
+    change_column_default :lfs_object_registry, :retry_count, from: nil, to: 0
+    add_column :lfs_object_registry, :state, :integer, null: false, limit: 2, default: 0
+    add_column :lfs_object_registry, :last_synced_at, :datetime_with_timezone
+    # rubocop:disable Migration/AddLimitToTextColumns
+    # limit is added in 20210225200858_add_text_limit_to_lfs_object_registry_last_sync_failure
+    add_column :lfs_object_registry, :last_sync_failure, :text
+    # rubocop:enable Migration/AddLimitToTextColumns
+  end
+
+  def down
+    change_column_default :lfs_object_registry, :retry_count, from: 0, to: nil
+    remove_column :lfs_object_registry, :state
+    remove_column :lfs_object_registry, :last_synced_at
+    remove_column :lfs_object_registry, :last_sync_failure
+  end
+end

ee/db/geo/post_migrate/20210125222907_add_lfs_object_state_index.rb

+# frozen_string_literal: true
+
+class AddLfsObjectStateIndex < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  INDEX_NAME = 'index_state_in_lfs_objects'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :lfs_object_registry, :state, name: INDEX_NAME
+  end
+
+  def down
+    remove_concurrent_index :lfs_object_registry, :state, name: INDEX_NAME
+  end
+end

ee/db/geo/post_migrate/20210225200858_add_text_limit_to_lfs_object_registry_last_sync_failure.rb

+# frozen_string_literal: true
+
+class AddTextLimitToLfsObjectRegistryLastSyncFailure < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_text_limit :lfs_object_registry, :last_sync_failure, 255
+  end
+
+  def down
+    remove_text_limit :lfs_object_registry, :last_sync_failure
+  end
+end

ee/db/geo/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2021_02_17_020156) do
+ActiveRecord::Schema.define(version: 2021_02_25_200858) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -82,12 +82,16 @@ ActiveRecord::Schema.define(version: 2021_02_17_020156) do
     t.datetime_with_timezone "retry_at"
     t.bigint "bytes"
     t.integer "lfs_object_id"
-    t.integer "retry_count"
+    t.integer "retry_count", default: 0
     t.boolean "missing_on_primary", default: false, null: false
     t.boolean "success", default: false, null: false
     t.binary "sha256"
+    t.integer "state", limit: 2, default: 0, null: false
+    t.datetime_with_timezone "last_synced_at"
+    t.text "last_sync_failure"
     t.index ["lfs_object_id"], name: "index_lfs_object_registry_on_lfs_object_id", unique: true
     t.index ["retry_at"], name: "index_lfs_object_registry_on_retry_at"
+    t.index ["state"], name: "index_state_in_lfs_objects"
     t.index ["success"], name: "index_lfs_object_registry_on_success"
   end