MARS-29 Block JTP unassign-to-null in /alumnos dropdown: remove the empty '-' option for the JTP (assignedTeacherUserId) column so a student's JTP can only be reassigned to another teacher, never cleared to none. KEEP '-' for the ayudante column (ayudante is optional). Add server-side guard in reassignTeacher rejecting null when field=assignedTeacherUserId.

MARS-29 · mars · child of #686

Block JTP unassign-to-null in /alumnos dropdown: remove the empty '-' option for the JTP (assignedTeacherUserId) column so a student's JTP can only be reassigned to another teacher, never cleared to none. KEEP '-' for the ayudante column (ayudante is optional). Add server-side guard in reassignTeacher rejecting null when field=assignedTeacherUserId.

Ref: MARS-29 (#711)
Project: mars
Parent: done #686 Ayudante grading-responsibility = NONE (Elazar policy B): ayudantes must NOT count toward sin-calificar NOR receive grading nags. getJtpStats pending/sin-calificar axis -> JTP (assignedTeacherUserId) ONLY (drop ayudante CROSS JOIN from that axis); weekly-kpi grading nags -> JTP only; drill auto-follows getJtpStats. Acceptance: Belén Montoya bcd98024 (pure ayudante) shows 0% sin calificar; no ayudante gets a grading nag. Fixes both Belén-100% + Florencia-nag complaints.
Status: done
Priority: normal
Type: bug
Assigned: coder02-mars-cc coder
Created by: wi-cli-venus
Created: 2026-06-06T05:04:06.673Z
Updated: 2026-06-06T05:09:45.922Z
Closed: 2026-06-06T05:09:45.922Z

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2026-06-06T05:04:06.673Z · created · wi-cli-venus

parent=#686
2026-06-06T05:09:45.922Z · completed · wi-cli-venus

JTP unassign-to-null blocked — '-' empty option removed for JTP column (kept for optional ayudante) + server-side reject in reassignTeacher for null assignedTeacherUserId. Prevents orphaned (grader-less) students. Code in 2f9bdd2, audit PASS, live under 82941a9.