chore: Mark previous Recalculation background migrations as succeeded

In https://gitlab.com/gitlab-org/gitlab/-/merge_requests/76375 we missed
the requirement to mark background jobs as successful upon completion.
In order to ensure we track these properly we should mark them.

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/343037

Changelog: other

db/post_migrate/20211217174331_mark_recalculate_finding_signatures_as_completed.rb

+# frozen_string_literal: true
+
+class MarkRecalculateFindingSignaturesAsCompleted < Gitlab::Database::Migration[1.0]
+  MIGRATION = 'RecalculateVulnerabilitiesOccurrencesUuid'
+
+  def up
+    # Only run migration for Gitlab.com
+    return unless ::Gitlab.com?
+
+    # In previous migration marking jobs as successful was missed
+    Gitlab::Database::BackgroundMigrationJob
+      .for_migration_class(MIGRATION)
+      .pending
+      .update_all(status: :succeeded)
+  end
+
+  def down
+    # no-op
+  end
+end

db/schema_migrations/20211217174331

+649360f4069aac4784f4d039015f8dda3f4bae28e8132f841e25b48f034a392e
\ No newline at end of file

spec/migrations/20211217174331_mark_recalculate_finding_signatures_as_completed_spec.rb

+# frozen_string_literal: true
+require 'spec_helper'
+require_migration!
+
+def create_background_migration_jobs(ids, status, created_at)
+  proper_status = case status
+                  when :pending
+                    Gitlab::Database::BackgroundMigrationJob.statuses['pending']
+                  when :succeeded
+                    Gitlab::Database::BackgroundMigrationJob.statuses['succeeded']
+                  else
+                    raise ArgumentError
+                  end
+
+  background_migration_jobs.create!(
+    class_name: 'RecalculateVulnerabilitiesOccurrencesUuid',
+    arguments: Array(ids),
+    status: proper_status,
+    created_at: created_at
+  )
+end
+
+RSpec.describe MarkRecalculateFindingSignaturesAsCompleted, :migration do
+  let_it_be(:background_migration_jobs) { table(:background_migration_jobs) }
+
+  context 'when RecalculateVulnerabilitiesOccurrencesUuid jobs are present' do
+    before do
+      create_background_migration_jobs([1, 2, 3], :succeeded, DateTime.new(2021, 5, 5, 0, 2))
+      create_background_migration_jobs([4, 5, 6], :pending, DateTime.new(2021, 5, 5, 0, 4))
+
+      create_background_migration_jobs([1, 2, 3], :succeeded, DateTime.new(2021, 8, 18, 0, 0))
+      create_background_migration_jobs([4, 5, 6], :pending, DateTime.new(2021, 8, 18, 0, 2))
+      create_background_migration_jobs([7, 8, 9], :pending, DateTime.new(2021, 8, 18, 0, 4))
+    end
+
+    describe 'gitlab.com' do
+      before do
+        allow(::Gitlab).to receive(:com?).and_return(true)
+      end
+
+      it 'marks all jobs as succeeded' do
+        expect(background_migration_jobs.where(status: 1).count).to eq(2)
+
+        migrate!
+
+        expect(background_migration_jobs.where(status: 1).count).to eq(5)
+      end
+    end
+
+    describe 'self managed' do
+      before do
+        allow(::Gitlab).to receive(:com?).and_return(false)
+      end
+
+      it 'does not change job status' do
+        expect(background_migration_jobs.where(status: 1).count).to eq(2)
+
+        migrate!
+
+        expect(background_migration_jobs.where(status: 1).count).to eq(2)
+      end
+    end
+  end
+end