Fix for the Rails test schema including decimal greater than 38 precision

[aidanharan]

Need work-around following this change to rails/activerecord/test/schema/schema.rb https://github.com/rails/rails/pull/51826/files#diff-2a57b61bbf9ee2c23938fc571d403799f68b4b530d65e2cde219a429bbf10af5L876