Update database configuration and add application settings: change SQLite database path in alembic.ini and create a new config.py file for managing application settings with environment variables.

alembic.ini

@@ -44,7 +44,7 @@ version_path_separator = os
 # are written from script.py.mako
 output_encoding = utf-8
 
-sqlalchemy.url = sqlite:///app/storage/database.db
+sqlalchemy.url = sqlite:///app/storage/audiobooks.db
 
 [post_write_hooks]
 # post_write_hooks defines scripts or Python functions that are run

app/config.py

@@ -0,0 +1,18 @@
+"""Application configuration."""
+import os
+from functools import lru_cache
+from pydantic_settings import BaseSettings
+
+class Settings(BaseSettings):
+    """Application settings."""
+    DATABASE_URL: str = os.getenv("DATABASE_URL", "sqlite:///app/storage/audiobooks.db")
+    STORAGE_PATH: str = os.getenv("STORAGE_PATH", "app/storage")
+    
+    class Config:
+        """Pydantic config."""
+        env_file = ".env"
+
+@lru_cache()
+def get_settings() -> Settings:
+    """Get cached settings."""
+    return Settings()