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What is XID?
PostgreSQL
The transaction ID used in PostgreSQL. Besides identifying the transaction, it's also used to determine the visible data a particular transaction can see.
Safer and faster database change and version control for DBAs and Developers

Bytebase is an open source, web-based database schema change and version control tool for teams. It offers a web-based collaboration workspace to help DBAs and Developers manage the lifecycle of application database schemas.