Worked on the JetBrains/Exposed repository to deliver enhanced support for storing and querying lists of UUIDs in reactive database pipelines. Focused on Kotlin and R2DBC, the work involved updating the ArrayTypeMapper to handle UUIDColumnType delegates, enabling the conversion of UUID lists into typed arrays suitable for reactive operations. This addition allowed efficient insertion of UUID arrays into R2DBC databases, addressing the requirements outlined in EXPOSED-856. By extending data modeling capabilities in Exposed, the implementation improved how applications manage collections of UUIDs in a reactive context, leveraging database and Kotlin expertise to support more flexible and robust data storage patterns.