Versioned.history

You're seeing just the function history, go back to Versioned module for more information.
Link to this function

history(module_or_struct, id_or_opts \\ [], opts \\ [])

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Specs

history(module() | Ecto.Schema.t(), any(), keyword()) :: [Ecto.Schema.t()]

List all versions for a schema module, newest first.

History will be found based on a module name and id or pass in a struct.

Options can include anything used by the repo's all/2 and history_query/3.