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PostgreSQL notifications allow for real-time communication between a database and external services, making them useful for simplifying project infrastructure in a number of ways:

1. Reduced polling: Instead of polling the database for updates or changes, notifications can be set up to send a message when a specific event occurs. This can reduce the load on the database and server, as well as eliminate the need for complex polling logic in applications.

2. Event-driven architecture: Notifications can be used to trigger events in external services or applications, allowing for a more efficient and scalable event-driven architecture. For example, notifications can be used to trigger updates in a cache or search index, or to relay new data to a messaging system.

3. Simplified codebase: By using notifications to communicate between services or components, the need for complex code to handle data synchronization or updates can be greatly reduced. This can lead to simpler and more maintainable codebases, which are easier to debug and test.

4. Real-time data processing: Notifications can enable real-time processing of data, enabling applications to respond to changes or updates as they occur. For example, notifications can be used to update dashboards, charts or graphs in real-time, without needing to refresh the data manually.

Overall, PostgreSQL notifications provide a powerful way to simplify project infrastructure by reducing complexity, enabling real-time communication and event-driven architecture, and facilitating streamlined data processing.