Hi @yazz ,

I’m wondering if you could use a similar approach to the one in the article below.  So, just backfill your bronze table first. Then, the downstream silver and gold layers will pick up the new data from the bronze layer.
In that approach you don't need to look for workarounds regarding DLT constraints (single-flow target and no mixed modes)

Backfilling historical data with Lakeflow Declarative Pipelines - Azure Databricks | Microsoft Learn