feat(nlp-service): log WARNING when DATABASE_URL absent, ERROR on DB failure

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

nlp-service/main.py

@@ -1,11 +1,14 @@
 """FastAPI app — /parse and /health endpoints."""
 from __future__ import annotations
 
+import logging
 import os
 from contextlib import asynccontextmanager
 
 from fastapi import FastAPI, HTTPException
 
+logger = logging.getLogger(__name__)
+
 from extractor import extract, get_person_matcher, set_person_matcher
 from models import ParseRequest, ParseResponse
 from person_matcher import PersonMatcher
@@ -30,8 +33,14 @@ async def lifespan(app: FastAPI):
         m = PersonMatcher()
         db_url = os.environ.get("DATABASE_URL")
         if db_url:
+            try:
                 rows = _load_persons_from_db(db_url)
                 m.load(rows)
+                logger.info("PersonMatcher loaded %d name variants from DB", len(m))
+            except Exception:
+                logger.error("Failed to load persons from DB — person matching disabled", exc_info=True)
+        else:
+            logger.warning("DATABASE_URL not set — person matching disabled")
         set_person_matcher(m)
     yield