Which features of PostgreSQL have you used extensively?

In PostgreSQL, I widely used the following features:

• Advanced data types: JSONB for storing and quickly searching JSON documents, arrays, UUID.
• Indexes: creating GIN and GiST indexes to accelerate full-text search and work with geospatial data.
• CTE (WITH queries) for simplifying complex queries and improving readability.
• Transactions and isolation levels to ensure data integrity.
• Functions and triggers on PL/pgSQL for automating business logic on the database side.
• Partitioning tables for efficient handling of large volumes of data.

These capabilities allowed creating efficient and scalable solutions, minimizing load on the application and optimizing data handling.