fix: default values in subordinate entities based on static_filtering, add: button visibility callbacks in entities' forms

utils/serialization.py

@@ -57,12 +57,10 @@ async def deserialize[T](session: AsyncSession, type_: type[T], value: str = Non
     elif type_ is datetime:
         if is_optional and not value:
             return None
-        if value[-3] == ":":
-            return datetime.strptime(value, "%Y-%m-%d %H:%M:%S")
-        elif value[-3] == "-":
+        if value[-3] == "-":
             return datetime.strptime(value, "%Y-%m-%d %H-%M")
         else:
-            raise ValueError("Invalid datetime format")
+            return datetime.fromisoformat(value)
     elif type_ is bool:
         return value == "True"
     elif type_ is Decimal: