Lesli is a Ruby on Rails SaaS development framework that provides guidelines for working with database versioning and migrations. It offers consistency, clarity, maintainability, collaboration, and scalability benefits. The migration standard involves a custom numbering system to identify collections, engines, namespaces, tables, and versions. The database versioning system in Lesli is separate from Rails migration versioning. The standard for creating new tables involves using the 'create_table_name' naming convention.
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