How do you design a forecasting system?

Hey y'all! How do you design your forecasting system? In my case, the company has many SKUs over a big region. We did an MVP to show our forecast improves the current process on the reported lags that are currently used by the business to monitor forecast health. Future is looking good, but I really want to be ready with a production-grade plan. Refitting a pool of models per SKU every week, then selecting the best one, feels like overkill and very sensitive to recent flukes. I thought of having a pool of models (i.e. config/setups) and labelling them as champion if a specific config results i