Sub-ticket of MARS-126 Real-life-as-SSOT JTP attribution analysis: quantify divergence between start-of-year studentAssignments (error-prone excel import) and actual student JTP picks (práctica.jtpUserId). Two mismatch classes: (1) JTP students picked but aren't assigned to; (2) students assigned to a JTP who picked a different one. Analysis only first (no writes); evidence base for evidence-based reassignment (NOT admin-pick UI). Links MARS-43 + live-vs-snapshot rule. (Elazar 2026-06-14) · mars