In what cases is it recommended to use PostgreSQL in a project?

PostgreSQL is recommended for projects when:

• Support for complex queries and transactions with a high level of consistency (ACID) is required.
• Extensibility and support for user-defined data types, functions, and operators are needed.
• Working with geospatial data (PostGIS) or full-text search is important in the project.
• Scalability and reliability are necessary when working with large volumes of data.
• Support for complex relationships between data and a relational model is required.

Example: if you are developing a financial application with many interconnected tables and complex business logic, PostgreSQL will be a good choice due to its reliability and rich functionality.