updated description of database preparation

README.md

@@ -56,12 +56,21 @@ energy-consumption-ingester/
 4. **Set up PostgreSQL database:**
 
    ```bash
-   # Create database
-   createdb energy_consumption
+   # Connect to Postgres14 host
+   psql -U <POSTGRES_ADMIN> -h <POSTGERS_HOST> -p <POSTGERS_PORT>
 
-   # Create user (optional - run the script)
-   chmod +x scripts/create_db_user.sh
-   ./scripts/create_db_user.sh
+   # Create database user
+   CREATE USER <DB_USER> WITH PASSWORD <DB_PASSWORD>;
+
+   # Create database
+   CREATE DATABASE <DB_NAME>;
+
+   # Grant full privileges on database to user
+   GRANT ALL PRIVILEGES ON DATABASE <DB_NAME> TO <DB_USER>;
+
+   # (Optional) verify new user and database creation
+   \q
+   psql -U <DB_USER> -h <POSTGRES_HOST> -p <POSTGERS_PORT>
    ```
 
 ## Configuration