Hi@PV17 - I would expect most schema limitations would be applied by the underlying database. For example Postgres has a column limit of 1600 and SQL Server allows 1024 with the ability to extend this using the wide tables feature.
There may be some hard limits programmed into the Campaign software itself to make it function properly with an overly large number of schemas, columns, etc.so you might need to revisit your data schema and limit so you only access what you need.
Cheers
Darren