Sub-ticket of MARS-22 student-assignment-tcm.ts peer-inference fallback (L188-234) seeds a NULL SA from OTHER students' practicas.jtpUserId/ayudanteUserId snapshot; TCM-gated (deletedAt IS NULL + role-matched) so stale teachers rejected — NOT a rule-(b) violation, low risk. Tighten to prefer live peer SA over práctica snapshot. · mars