DB: Oživen hack pro mypy

Nedává moc smysl, protože TypeEngine není parametrizovaný typ ...
ale kupodivu to type-checkerem projde a zamaskuje to problémy s enumy.

mo/db.py

@@ -8,7 +8,7 @@ import locale
 import os
 import re
 from sqlalchemy import \
-    Boolean, Column, DateTime, Enum, ForeignKey, Integer, String, Text, UniqueConstraint, \
+    Boolean, Column, DateTime, ForeignKey, Integer, String, Text, UniqueConstraint, \
     text, func, \
     create_engine, inspect, select
 from sqlalchemy.engine import Engine
@@ -27,6 +27,16 @@ import mo.config as config
 from mo.place_level import place_levels, PlaceLevel
 from mo.util_format import timeformat_short, timedelta, time_and_timedelta
 
+# HACK: Work-around for https://github.com/dropbox/sqlalchemy-stubs/issues/114
+from typing import TYPE_CHECKING, TypeVar, Type
+if TYPE_CHECKING:
+    from sqlalchemy.sql.type_api import TypeEngine
+    T = TypeVar('T')
+    class Enum(TypeEngine[T]):
+        def __init__(self, enum: Type[T], **kwargs: Any) -> None: ...
+else:
+    from sqlalchemy import Enum
+
 
 # Funkce f_unaccent je definovaná v db.ddl, naučme Alchymii volat ji:
 class f_unaccent(ReturnTypeFromArgs):