set up docker env

app.py

@@ -20,7 +20,9 @@ def create_app():
     app = Flask(__name__)
 
     # Configure the database
-    app.config['SQLALCHEMY_DATABASE_URI'] = os.getenv('DATABASE_URL', 'postgresql://postgres:postgres@db:5432/docupulse')
+    # Use 'db' as host when running in Docker, 'localhost' for local development
+    db_host = 'db' if os.getenv('DOCKER_ENV') else 'localhost'
+    app.config['SQLALCHEMY_DATABASE_URI'] = os.getenv('DATABASE_URL', f'postgresql://postgres:1253@{db_host}:5432/docupulse')
     app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
     app.config['SECRET_KEY'] = os.getenv('SECRET_KEY', 'your-secret-key-here')
     app.config['UPLOAD_FOLDER'] = os.path.join(app.root_path, 'static', 'uploads')