What exactly did you do with databases? Please tell us more about your work with PostgreSQL.

In my work with PostgreSQL, I was involved in creating and optimizing queries for test scenarios, as well as preparing test data. I often used SQL for selecting, updating, and deleting data to verify the application's correct interaction with the database.

For example, I wrote JOIN queries to check relationships between tables, created indexes to speed up queries, and used transactions to ensure data integrity during tests. I also used schema migration tools (such as Flyway or Liquibase) to manage database versions in the testing environment.

Additionally, I automated data verification in the database after application operations to ensure that data was being recorded and modified correctly.