feat: deals filters

schemas/base.py

@@ -1,4 +1,4 @@
-from typing import Self, Optional
+from typing import Self, Optional, Literal
 
 from pydantic import BaseModel
 from pydantic.alias_generators import to_camel
@@ -45,6 +45,14 @@ class PaginationInfoSchema(BaseSchema):
     total_items: int
 
 
+type SortDir = Literal["asc", "desc"]
+
+
+class SortingSchema(BaseSchema):
+    field: Optional[str] = None
+    direction: Optional[SortDir] = None
+
+
 class BaseEnumSchema(BaseSchema):
     id: int
     name: str