fix db connection

app.py

@@ -20,9 +20,9 @@ def create_app():
     app = Flask(__name__)
 
     # Configure the database
-    app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql://postgres:1253@localhost:5432/docupulse'
+    app.config['SQLALCHEMY_DATABASE_URI'] = os.getenv('DATABASE_URL', 'postgresql://postgres:postgres@db:5432/docupulse')
     app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
-    app.config['SECRET_KEY'] = 'your-secret-key-here'
+    app.config['SECRET_KEY'] = os.getenv('SECRET_KEY', 'your-secret-key-here')
     app.config['UPLOAD_FOLDER'] = os.path.join(app.root_path, 'static', 'uploads')
 
     # Initialize extensions