Reject creating a second practice on the same course, module, or lesson with 409 Conflict, and enforce the rule in the database via unique partial indexes.
Co-authored-by: Cursor <cursoragent@cursor.com>
POST /practices and exam-prep practice create accept missing or null title; persist as empty string. Refresh OpenAPI and document the behavior.
Co-authored-by: Cursor <cursoragent@cursor.com>
