Tighten Auto-Match refs and log accept/reject (Phase 2).

Raise reference quality floor to 0.5, align browse/run/auto-accept defaults with UI copy, and persist match_decisions for later confidence calibration.

backend/api/people.py

@@ -21,7 +21,7 @@ from backend.schemas.people import (
     PersonUpdateRequest,
     PersonWithFacesResponse,
 )
-from backend.services.face_service import accept_auto_match_matches
+from backend.services.face_service import accept_auto_match_matches, record_match_decisions
 
 router = APIRouter(prefix="/people", tags=["people"])
 
@@ -278,9 +278,63 @@ def accept_matches(
     
     user_id = current_user["user_id"]
     try:
-        identified_count, updated_count = accept_auto_match_matches(
-            db, person_id, request.face_ids, user_id=user_id
-        )
+        person = db.query(Person).filter(Person.id == person_id).first()
+        if not person:
+            raise HTTPException(
+                status_code=status.HTTP_404_NOT_FOUND,
+                detail=f"Person {person_id} not found",
+            )
+
+        if request.face_ids:
+            accept_auto_match_matches(
+                db, person_id, request.face_ids, user_id=user_id
+            )
+
+        # Log accepts (with optional scores from client)
+        score_by_face = {
+            item.face_id: item for item in (request.accepted_matches or [])
+        }
+        accept_items = []
+        for face_id in request.face_ids:
+            scored = score_by_face.get(face_id)
+            accept_items.append(
+                {
+                    "face_id": face_id,
+                    "similarity": scored.similarity if scored else None,
+                    "distance": scored.distance if scored else None,
+                    "reference_face_id": scored.reference_face_id if scored else None,
+                }
+            )
+        if accept_items:
+            record_match_decisions(
+                db,
+                decision="accept",
+                source="auto_match",
+                person_id=person_id,
+                items=accept_items,
+                user_id=user_id,
+                commit=True,
+            )
+
+        if request.rejected_matches:
+            reject_items = [
+                {
+                    "face_id": item.face_id,
+                    "similarity": item.similarity,
+                    "distance": item.distance,
+                    "reference_face_id": item.reference_face_id,
+                }
+                for item in request.rejected_matches
+            ]
+            record_match_decisions(
+                db,
+                decision="reject",
+                source="auto_match",
+                person_id=person_id,
+                items=reject_items,
+                user_id=user_id,
+                commit=True,
+            )
     except ValueError as e:
         if "not found" in str(e).lower():
             raise HTTPException(