How to preserve evidence for future Intellectual Property trial?

I’m awaiting a trial against a company providing a SaaS product. The product is based on a source code of mine and the company is using it without a license and refusing to stop the use.

The court delays in my jurisdiction (in Europe) are reaching many months and I’m looking for ideas how can I record the fact that they are operating the product for the purpose of the trial. This could be important in case they shut the product down before the trial takes place. Such record would give me a base for the claim for compensation for the period of unlicensed use.

Not sure if the technology stack is important here but the code is mostly Ruby on Rails and React.