initial functionality and styling pass

config.py

@@ -2,14 +2,29 @@ import os
 
 class Config:
     SECRET_KEY = os.environ.get('SECRET_KEY', 'you-will-never-guess')
+    DB_TYPE = os.environ.get('DB_TYPE', 'sqlite').lower()  # 'sqlite' or 'postgresql'
 
-    DB_USER = os.environ.get('DB_USER', 'postgres')
-    DB_PASS = os.environ.get('DB_PASS', 'postgres')
-    DB_HOST = os.environ.get('DB_HOST', 'db')
-    DB_PORT = os.environ.get('DB_PORT', '5432')
-    DB_NAME = os.environ.get('DB_NAME', 'postgres')
+    if DB_TYPE == 'postgresql':
+        DB_USER = os.environ.get('DB_USER', 'postgres')
+        DB_PASS = os.environ.get('DB_PASS', 'postgres')
+        DB_HOST = os.environ.get('DB_HOST', 'localhost')
+        DB_PORT = os.environ.get('DB_PORT', '5432')
+        DB_NAME = os.environ.get('DB_NAME', 'postgres')
+
+        SQLALCHEMY_DATABASE_URI = (
+            f'postgresql://{DB_USER}:{DB_PASS}@{DB_HOST}:{DB_PORT}/{DB_NAME}'
+        )
+
+    elif DB_TYPE == 'sqlite':
+        BASEDIR = os.path.abspath(os.path.dirname(__file__))
+        DB_NAME = os.environ.get('DB_NAME', 'app.db')
+        SQLALCHEMY_DATABASE_URI = f'sqlite:///{os.path.join(BASEDIR, DB_NAME)}'
+
+    else:
+        raise ValueError(f"Unsupported DB_TYPE '{DB_TYPE}'. Use 'sqlite' or 'postgresql'.")
 
-    SQLALCHEMY_DATABASE_URI = (
-        f'postgresql://{DB_USER}:{DB_PASS}@{DB_HOST}:{DB_PORT}/{DB_NAME}'
-    )
     SQLALCHEMY_TRACK_MODIFICATIONS = False
+
+    CELERY_BROKER_URL = 'redis://localhost:6379/0'
+    CELERY_RESULT_BACKEND = 'redis://localhost:6379/0'
+