Fix HF Spaces startup: ensure DB directory exists before engine init

src/content_engine/models/database.py

@@ -178,6 +178,11 @@ class TrainingJob(Base):
 
 # --- Engine / Session factories ---
 
+# Ensure database directories exist
+from pathlib import Path as _Path
+_db_path = settings.database.url.replace("sqlite+aiosqlite:///", "")
+_Path(_db_path).parent.mkdir(parents=True, exist_ok=True)
+
 _catalog_engine = create_async_engine(
     settings.database.url,
     echo=False,