Ecto.Adapter.ensure_all_started

You're seeing just the callback ensure_all_started, go back to Ecto.Adapter module for more information.
Link to this callback

ensure_all_started(config, type)

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Specs

ensure_all_started(
  config :: Keyword.t(),
  type :: :permanent | :transient | :temporary
) :: {:ok, [atom()]} | {:error, atom()}

Ensure all applications necessary to run the adapter are started.