Ecto.Schema.schema

You're seeing just the macro schema, go back to Ecto.Schema module for more information.
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schema(source, list)

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Defines a schema struct with a source name and field definitions.

An additional field called __meta__ is added to the struct for storing internal Ecto state. This field always has a Ecto.Schema.Metadata struct as value and can be manipulated with the Ecto.put_meta/2 function.