API and database models refactoring

models/api/auth.py

@@ -0,0 +1,62 @@
+import re
+from datetime import datetime
+from typing import List, Optional
+
+from pydantic import BaseModel, ConfigDict, EmailStr, Field, field_validator
+
+
+# User Authentication Models
+class UserRegister(BaseModel):
+    email: EmailStr = Field(..., description="Valid email address")
+    username: str = Field(
+        ..., min_length=3, max_length=50, description="Username (3-50 characters)"
+    )
+    password: str = Field(
+        ..., min_length=6, description="Password (minimum 6 characters)"
+    )
+
+    @field_validator("username")
+    @classmethod
+    def validate_username(cls, v):
+        if not re.match(r"^[a-zA-Z0-9_]+$", v):
+            raise ValueError(
+                "Username must contain only letters, numbers, or underscores"
+            )
+        return v.lower().strip()
+
+    @field_validator("password")
+    @classmethod
+    def validate_password(cls, v):
+        if len(v) < 6:
+            raise ValueError("Password must be at least 6 characters long")
+        return v
+
+
+class UserLogin(BaseModel):
+    username: str = Field(..., description="Username")
+    password: str = Field(..., description="Password")
+
+    @field_validator("username")
+    @classmethod
+    def validate_username(cls, v):
+        return v.strip()
+
+
+class UserResponse(BaseModel):
+    model_config = ConfigDict(from_attributes=True)
+
+    id: int
+    email: str
+    username: str
+    role: str
+    is_active: bool
+    last_login: Optional[datetime] = None
+    created_at: datetime
+    updated_at: datetime
+
+
+class LoginResponse(BaseModel):
+    access_token: str
+    token_type: str = "bearer"
+    expires_in: int
+    user: UserResponse