type annotate objects_db and observations_db

Author: jscheidtmann

python/PiFinder/catalog_imports/database.py

@@ -4,11 +4,16 @@
 This module provides centralized access to database objects for all catalog loaders.
 """
 
+from typing import Optional
+
+from PiFinder.db.objects_db import ObjectsDatabase
+from PiFinder.db.observations_db import ObservationsDatabase
+
 from .catalog_import_utils import init_databases
 
 # Global database objects shared across all catalog loaders
-objects_db = None
-observations_db = None
+objects_db: Optional[ObjectsDatabase] = None
+observations_db: Optional[ObservationsDatabase] = None
 
 
 def init_shared_database():