Static check the DAG

[MaxHalford]

Consider the following edge case:

• You clone table A and B from production
• B depends on A
• Now you remove A's script
• If you refresh B, it will still work on your branch, because you've clone A into it; deleting A's definition didn't delete A's physical table
• The refresh will fail in production

I think the cleanest solution is to be able to do a static analysis of the DAG. If B depends on A, then A needs to have a definition.