This is an InputModel (Schema) to be used with CodegenCS code generator, which allows CodegenCS to generate code based on a Database Schema.
Basically it contains classes to represent the Database Schema, and there's another project with Schema Reader classes (MSSQL and PostgreSQL) to extract the Schema from those databases.
Check out the main project to see more information.
https://github.com/Drizin/CodegenCS/tree/master/src/Models/CodegenCS.Models.DbSchema
MIT License