백엔드 전체 구현 완료: 내부 서비스(Auth, Client, Realtime), API 엔드포인트 및 스케줄러 구현

backend/app/core/config.py

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+import os
+from typing import List, Union
+from pydantic import AnyHttpUrl, field_validator
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+class Settings(BaseSettings):
+    PROJECT_NAME: str = "BatchuKis Backend"
+    API_V1_STR: str = "/api"
+    
+    # Server Config
+    PORT: int = 80
+    HOST: str = "0.0.0.0"
+    
+    # Security: CORS & Allowed Hosts
+    # In production, this should be set to ["kis.tindevil.com"]
+    ALLOWED_HOSTS: List[str] = ["localhost", "127.0.0.1", "kis.tindevil.com"]
+    
+    # CORS Origins
+    BACKEND_CORS_ORIGINS: List[Union[str, AnyHttpUrl]] = [
+        "http://localhost",
+        "http://localhost:3000",
+        "https://kis.tindevil.com",
+    ]
+
+    # Database
+    # Using aiosqlite for async SQLite
+    DATABASE_URL: str = "sqlite+aiosqlite:///./kis_stock.db"
+
+    # Timezone
+    TIMEZONE: str = "Asia/Seoul"
+
+    model_config = SettingsConfigDict(
+        env_file=".env", 
+        env_file_encoding="utf-8",
+        case_sensitive=True,
+        extra="ignore"
+    )
+
+    @field_validator("ALLOWED_HOSTS", mode="before")
+    def assemble_allowed_hosts(cls, v: Union[str, List[str]]) -> List[str]:
+        if isinstance(v, str) and not v.startswith("["):
+            return [i.strip() for i in v.split(",")]
+        elif isinstance(v, (list, str)):
+            return v
+        raise ValueError(v)
+
+    @field_validator("BACKEND_CORS_ORIGINS", mode="before")
+    def assemble_cors_origins(cls, v: Union[str, List[str]]) -> List[Union[str, AnyHttpUrl]]:
+        if isinstance(v, str) and not v.startswith("["):
+            return [i.strip() for i in v.split(",")]
+        elif isinstance(v, (list, str)):
+            return v
+        raise ValueError(v)
+
+settings = Settings()