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In the old core, its own GetList, Update, Add, and Delete are programmed for each entity.
To make database selecting and saving operations uniform with the same parameters and filters. If possible, entity tables must be serviced with a minimum of a new code. Standard events of adding/changing/deleting must be available automatically.
An entity describes a table in the database, and also contains entity fields. The DataManager performs selection and entity change operations. In practice, the work is mostly done at the level of the DataManager.