add promocodes

app/models/promo.py

@@ -0,0 +1,33 @@
+from pydantic import BaseModel, Field
+from typing import Optional
+from datetime import datetime
+
+class PromoBase(BaseModel):
+    code: str = Field(..., min_length=3, max_length=64)
+    reward_coins: int = Field(..., ge=1, le=1_000_000)
+    max_uses: Optional[int] = Field(default=None, ge=1)  # None = бесконечно
+    is_active: bool = True
+    starts_at: Optional[datetime] = None
+    ends_at: Optional[datetime] = None
+
+class PromoCreate(PromoBase):
+    pass
+
+class PromoUpdate(BaseModel):
+    reward_coins: Optional[int] = Field(default=None, ge=1, le=1_000_000)
+    max_uses: Optional[int] = Field(default=None, ge=1)
+    is_active: Optional[bool] = None
+    starts_at: Optional[datetime] = None
+    ends_at: Optional[datetime] = None
+
+class PromoInDB(PromoBase):
+    id: str
+    uses_count: int
+    created_at: datetime
+    updated_at: datetime
+
+class PromoRedeemResponse(BaseModel):
+    code: str
+    reward_coins: int
+    new_balance: int
+