chore: establish project baseline

central/scripts/import_legacy_ncm.py

@@ -0,0 +1,25 @@
+"""Seed reviewed official legacy NCM evidence; it never selects a successor."""
+
+from central.app.db import SessionLocal
+from central.app.models import LegacyNcmEntry
+
+
+LEGACY_NCM = {
+    "code": "02071400",
+    "source": "Siscomex NCM official nomenclature download",
+    "source_date": "2026-09-17",
+    "reason": "NCM not present in current official nomenclature; no official successor.",
+}
+
+
+def main():
+    with SessionLocal() as session:
+        entry = session.get(LegacyNcmEntry, LEGACY_NCM["code"])
+        if entry is None:
+            session.add(LegacyNcmEntry(**LEGACY_NCM, successor_code=None))
+            session.commit()
+    print({"code": LEGACY_NCM["code"], "status": "LEGACY_NCM", "successor_code": None})
+
+
+if __name__ == "__main__":
+    main()