How to Handle the Psycopg2 UniqueViolation Error in Python

The psycopg2.errors.UniqueViolation occurs when a user tries to insert a duplicate key value in an SQL database, where a key value is defined to uniquely reference specific rows of a table. This error is demonstrated through an example where a duplicate name is inserted into a table using psycopg2, resulting in a UniqueViolation error because the name is designated as the primary key. To handle such errors, one can modify the primary key to include multiple fields or introduce an additional unique identifier, such as an ID column, to ensure uniqueness. Effective database design, including choosing appropriate key values and considering how data will be accessed and updated, can help prevent UniqueViolation errors. Tools like Rollbar are recommended for tracking and managing such errors in real-time to ease the process of deploying production code.