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Fixes #1005 I was experiencing the same error as was reported in this issue and have submitted a PR to fix which worked for me. The underlying issue with the seed script was that the CREATE EXTENSION IF NOT EXISTS "uuid-ossp" statement was being executed multiple times within separate seed functions (seedUsers, seedInvoices, seedCustomers, etc.), even though the extension is a one-time setup for the entire database. PostgreSQL does not allow the same extension to be created multiple times, and executing it within each function could still lead to conflicts when trying to insert the extension multiple times during a single database transaction. This caused the 23505 unique constraint violation error, as PostgreSQL detected the duplicate attempt to install the uuid-ossp extension. The solution was to move the extension creation outside of the transactional logic, ensuring it runs once before any other operations and preventing redundant attempts to create the extension.

Before submitting [x] I have searched existing issues to make sure this isn't a duplicate [x] I have completed this chapter and encountered the issue myself Chapter URL https://nextjs.org/learn/seo/url-structure Issue Type Typo or grammatical error Description There is a duplicated phrase in this sentence: "Next.js uses file-system routing built on the file-system routing built on the concept of pages." The phrase “file-system routing built on the” appears twice. Suggested correction: "Next.js uses file-system routing built on the concept of pages." Small typo, but reporting for clarity. Expected vs Actual Behavior Expected: Next.js uses file-system routing built on the concept of pages. When a file is added to the pages directory, it is automatically available as a route. The files and folders inside the pages directory can be used to define most common patterns. Actual: Next.js uses file-system routing built on the file-system routing built on the concept of pages. When a file is added to the pages directory, it is automatically available as a route. The files and folders inside the pages directory can be used to define most common patterns. Environment (optional) _No response_ Screenshots (optional) _No response_