rapid interations of server side app and firefox extension

backend/app/config.py

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+"""Application configuration using pydantic-settings."""
+
+from functools import lru_cache
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    """Application settings loaded from environment variables."""
+
+    # Database
+    database_url: str = "postgresql://gdl:password@localhost:5432/gallery_subscriber"
+
+    # Redis
+    redis_url: str = "redis://localhost:6379/0"
+
+    # Security
+    secret_key: str = "change-me-in-production"
+    # Note: extension_api_key is now stored in database and auto-generated
+
+    # Paths
+    download_path: str = "/data/downloads"
+    config_path: str = "/data/config"
+    cookies_path: str = "/data/cookies"
+
+    # Download settings
+    download_parallel_limit: int = 3
+    download_rate_limit: float = 3.0
+    default_check_interval: int = 3600  # seconds
+
+    # Server
+    host: str = "0.0.0.0"
+    port: int = 8080
+    debug: bool = False
+    log_level: str = "INFO"
+
+    @property
+    def async_database_url(self) -> str:
+        """Convert database URL to async version for asyncpg."""
+        return self.database_url.replace("postgresql://", "postgresql+asyncpg://")
+
+    class Config:
+        env_file = ".env"
+        env_file_encoding = "utf-8"
+
+
+@lru_cache
+def get_settings() -> Settings:
+    """Get cached settings instance."""
+    return Settings()