corrected path for upgrade

labertasche/blueprints/bp_upgrades/db_v2.py

@@ -136,8 +136,9 @@ def upgrade_db_to_v2_export():
         if compare_digest(db_uri[0:6], "sqlite"):
             m = search("([/]{3})(.*)", db_uri)
             new_db = get_backup_folder() / "labertasche.db"
-            old_db = Path(m.group(2)).absolute()
-            copy(old_db, new_db)
+            old_db = Path(current_app.root_path)
+            old_db = old_db / m.group(2)
+            copy(old_db.absolute(), new_db)
     except Exception as e:
         return make_response(jsonify(status='exception-copy-db', msg=str(e)), 400)