1 files changed, 20 insertions, 0 deletions
diff --git a/tooling/danger/database.rb b/tooling/danger/database.rb
new file mode 100644
index 00000000000..4cfac7c4af4
--- /dev/null
+++ b/tooling/danger/database.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+module Tooling
+  module Danger
+    module Database
+      TIMESTAMP_MATCHER = /(?<timestamp>\d{14})/
+      MIGRATION_MATCHER = %r{\A(ee/)?db/(geo/)?(post_)?migrate/}
+
+      def find_migration_files_before(file_names, cutoff)
+        migrations = file_names.select { |f| f.match?(MIGRATION_MATCHER) }
+        migrations.select do |migration|
+          next unless match = TIMESTAMP_MATCHER.match(migration)
+
+          timestamp = Date.parse(match[:timestamp])
+          timestamp < cutoff
+        end
+      end
+    end
+  end
+end