How do you use Table-per-Hierarchy (TPH) vs Table-per-Type (TPT)?

They are inheritance mapping strategies. TPH maps an entire class hierarchy to a single table. TPT maps each class to its own table.

TPH (Default): Fast querying, but requires a 'Discriminator' column and nullable columns for subclass properties. TPT: Cleaner schema (normalized), but queries require multiple JOINs which degrades performance. Configured in TPT by calling ToTable("TableName") on subclasses.