Harden location db startup validation

app/main.py

@@ -8,6 +8,18 @@ from app import models  # noqa: F401
 from app.api.routes import pages, status
 from app.api.routes.location import router as location_router
 from app.config import get_settings
+from scripts.location_db_adopt import LocationDatabaseAdoptionError, validate_location_runtime_db
+
+
+def ensure_location_db_ready() -> None:
+    settings = get_settings()
+    if settings.location_sqlite_path is None:
+        return
+
+    try:
+        validate_location_runtime_db(settings.location_database_url)
+    except LocationDatabaseAdoptionError as exc:
+        raise RuntimeError(str(exc)) from exc
 
 
 def ensure_runtime_dirs() -> None:
@@ -20,6 +32,7 @@ def ensure_runtime_dirs() -> None:
 @asynccontextmanager
 async def lifespan(_: FastAPI):
     ensure_runtime_dirs()
+    ensure_location_db_ready()
     yield