fix(v2-ingestion): harden LBA/BCL snapshot contract for public data

apps/ingestion/services/snapshot_import.py

@@ -62,6 +62,21 @@ def _parse_season_dates(label: str) -> tuple[date, date]:
     return date(year, 9, 1), date(year + 1, 7, 31)
 
 
+def _parse_optional_birth_date(value: str | None) -> date | None:
+    if value in (None, ""):
+        return None
+    return parse_date(value)
+
+
+def _split_name_parts(full_name: str) -> tuple[str, str]:
+    parts = full_name.strip().split(maxsplit=1)
+    if not parts:
+        return "", ""
+    if len(parts) == 1:
+        return parts[0], ""
+    return parts[0], parts[1]
+
+
 def _resolve_nationality(value: str | None) -> Nationality | None:
     if not value:
         return None
@@ -152,10 +167,13 @@ def _upsert_record(record: dict[str, Any], *, source_name: str, snapshot_date: d
         },
     )
 
-    position, _ = Position.objects.get_or_create(
-        code=_position_code(record["position"]),
-        defaults={"name": record["position"]},
-    )
+    position_value = record.get("position")
+    position = None
+    if position_value:
+        position, _ = Position.objects.get_or_create(
+            code=_position_code(position_value),
+            defaults={"name": position_value},
+        )
     role = None
     if record.get("role"):
         role, _ = Role.objects.get_or_create(
@@ -163,19 +181,24 @@ def _upsert_record(record: dict[str, Any], *, source_name: str, snapshot_date: d
             defaults={"name": record["role"]},
         )
 
+    first_name = record.get("first_name") or ""
+    last_name = record.get("last_name") or ""
+    if not first_name and not last_name:
+        first_name, last_name = _split_name_parts(record["full_name"])
+
     player, _ = Player.objects.update_or_create(
         source_name=source_key,
         source_uid=record["player_external_id"],
         defaults={
-            "first_name": record["first_name"],
-            "last_name": record["last_name"],
+            "first_name": first_name,
+            "last_name": last_name,
             "full_name": record["full_name"],
-            "birth_date": parse_date(record["birth_date"]),
+            "birth_date": _parse_optional_birth_date(record.get("birth_date")),
             "nationality": _resolve_nationality(record.get("nationality")),
             "nominal_position": position,
             "inferred_role": role,
-            "height_cm": record["height_cm"],
-            "weight_kg": record["weight_kg"],
+            "height_cm": record.get("height_cm"),
+            "weight_kg": record.get("weight_kg"),
             "is_active": True,
         },
     )