add bot entity's events, external bot command call

src/quickbot/model/descriptors.py

@@ -122,7 +122,7 @@ class _BaseFieldDescriptor:
     localizable: bool = False
     bool_false_value: str | LazyProxy = "no"
     bool_true_value: str | LazyProxy = "yes"
-    ep_form: str | None = None
+    ep_form: str | Callable[["BotContext"], str] | None = None
     ep_parent_field: str | None = None
     ep_child_field: str | None = None
     dt_type: Literal["date", "datetime"] = "date"
@@ -195,9 +195,20 @@ class _BaseEntityDescriptor:
             EntityPermission.DELETE_ALL: [RoleBase.SUPER_USER],
         }
     )
+    before_create: Callable[["BotContext"], Union[bool, str]] | None = None
+    before_create_save: (
+        Callable[["BotEntity", "BotContext"], Union[bool, str]] | None
+    ) = None
+    before_update_save: (
+        Callable[[dict[str, Any], dict[str, Any], "BotContext"], Union[bool, str]]
+        | None
+    ) = None
+    before_delete: Callable[["BotEntity", "BotContext"], Union[bool, str]] | None = None
     on_created: Callable[["BotEntity", "BotContext"], None] | None = None
     on_deleted: Callable[["BotEntity", "BotContext"], None] | None = None
-    on_updated: Callable[["BotEntity", "BotContext"], None] | None = None
+    on_updated: Callable[[dict[str, Any], "BotEntity", "BotContext"], None] | None = (
+        None
+    )
 
 
 @dataclass(kw_only=True)
@@ -220,6 +231,7 @@ class CommandCallbackContext[UT: UserBase]:
     )
     message_text: str | None = None
     register_navigation: bool = True
+    clear_navigation: bool = False
     message: Message | CallbackQuery
     callback_data: ContextData
     db_session: AsyncSession