app/core/config.py

from pydantic_settings import BaseSettings, SettingsConfigDict

class Settings(BaseSettings):
    # Database
    DATABASE_URL: str

    # JWT
    JWT_SECRET: str = "changeme"
    JWT_ALGORITHM: str = "HS256"
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60
    OPENAI_API_KEY: str | None = None
    OPENAI_MODEL: str = "gpt-4.1-mini"

    model_config = SettingsConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        extra="allow"
    )

settings = Settings()