diff --git a/volumes/db/cc/75-exam-marker-region-meta.sql b/volumes/db/cc/75-exam-marker-region-meta.sql
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+--==========================================================================================
+-- 75. exam_response_areas.meta — rich recognition payload from the extraction service (P2)
+--==========================================================================================
+-- The extraction service (docling-exam-spike analyse contract) returns richer per-region detail than
+-- the thin first-pass could: per-option OMR box geometry + fill (boxes[]), select_n ("tick 2 of 5"),
+-- n_options, the expected unit/quantity for single-line answers, and the data_table an MC question reads.
+-- These have no dedicated columns; keep them in a jsonb sidecar so the canvas can render tick boxes /
+-- units / MC option counts without a column per attribute. Nullable, defaults to {}.
+alter table public.exam_response_areas add column if not exists meta jsonb not null default '{}'::jsonb;
+
+comment on column public.exam_response_areas.meta is
+  'Extraction-service recognition detail: {n_lines, unit, quantity, n_boxes, n_options, select_n, box_form, boxes:[{x0,y0,x1,y1,fill}], table:{grid,n_cells}}. Rendered by the canvas; not authoritative for marking.';