Share your experience working with the PostgreSQL database and tell us about the most challenging tasks you had to solve using it.

In my work with PostgreSQL, I have dealt with tasks related to query optimization and ensuring high availability.

For example:

• Optimizing complex JOIN queries with large data volumes using indexes and execution plan analysis (EXPLAIN).
• Configuring replication to ensure fault tolerance and load balancing.
• Solving issues with locking and deadlocks during concurrent data access.

I have also encountered the need to write custom functions in PL/pgSQL to implement business logic on the database side, which helped reduce the load on the application and improve performance.