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I have created a module that adds a custom table.

I also created a Model, ResourceModel and Collection classes, and was able to use them to insert data into this new table by calling the ModelFactory class and saving (save()) the data.

But I am wondering if this is the best practice or if I should create Api interfaces for doing that, or/and using Service Contract even if I don't want this class in Magento API.

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You need:

  1. Resource Model for CRUD operations
  2. Model/ModelInterface for Data Modeling
  3. Repository/RepositoryInterface as frontend for database operations
  4. Custom table

Technically, you don't need interfaces but it is best practice and there is a reason behind it.

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