initial

backend/app/schemas/user.py

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+from datetime import datetime
+from pydantic import BaseModel, Field, field_validator
+import re
+
+
+class UserBase(BaseModel):
+    nickname: str = Field(..., min_length=2, max_length=50)
+
+
+class UserRegister(UserBase):
+    login: str = Field(..., min_length=3, max_length=50)
+    password: str = Field(..., min_length=6, max_length=100)
+
+    @field_validator("login")
+    @classmethod
+    def validate_login(cls, v: str) -> str:
+        if not re.match(r"^[a-zA-Z0-9_]+$", v):
+            raise ValueError("Login can only contain letters, numbers, and underscores")
+        return v.lower()
+
+
+class UserLogin(BaseModel):
+    login: str
+    password: str
+
+
+class UserUpdate(BaseModel):
+    nickname: str | None = Field(None, min_length=2, max_length=50)
+
+
+class UserPublic(UserBase):
+    id: int
+    login: str
+    avatar_url: str | None = None
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class UserWithTelegram(UserPublic):
+    telegram_id: int | None = None
+    telegram_username: str | None = None
+
+
+class TokenResponse(BaseModel):
+    access_token: str
+    token_type: str = "bearer"
+    user: UserPublic
+
+
+class TelegramLink(BaseModel):
+    telegram_id: int
+    telegram_username: str | None = None