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Step-1: Install Flask, Flask-SocketIO, Flask-GraphQL, Flask-RESTful, and psycopg2 packages using pip.

Step-2: Create a Flask application and initialize the SocketIO and GraphQL extensions.

Step-3: Set up a PostgreSQL database connection using the psycopg2 package.

Step-4: Define a RESTful API using Flask-RESTful for CRUD (Create, Read, Update, Delete) operations on the database.

Step-5: Implement a GraphQL schema using Flask-GraphQL and define resolvers to execute database queries.

Step-6: Use Flask-SocketIO to set up a WebSocket server to receive real-time updates from the database.

Step-7: Create a PostgreSQL trigger that sends notifications to the WebSocket server when data changes in the database.

Step-8: Implement a WebSocket event handler to receive and broadcast the notifications to connected clients.

Let's Get into it.

pip install Flask Flask-SocketIO Flask-GraphQL Flask-RESTful psycopg2