The phrase you're referencing likely refers to a well-known technical talk by Christophe Pettus (CEO of PostgreSQL Experts, Inc.).
: Unlike some other databases, PostgreSQL stays very close to the ANSI SQL standard, making it a predictable "solid" choice for production applications. PostgreSQL Proficiency for Python People - theb...
: Allows Python developers to store semi-structured data (like dicts) while maintaining the benefits of a relational database. The phrase you're referencing likely refers to a
In this talk, Pettus emphasizes that a of PostgreSQL for Python developers is its rich and extensible data types , which align closely with Python's high-level data structures. Key "Solid Features" for Python Developers Inc.). : Unlike some other databases
: A procedural language that lets you write functions and triggers directly in Python inside the database.