Ecto.Adapters.SQL.Connection.delete

You're seeing just the callback delete, go back to Ecto.Adapters.SQL.Connection module for more information.
Link to this callback

delete(prefix, table, filters, returning)

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Specs

delete(
  prefix :: String.t(),
  table :: String.t(),
  filters :: [atom()],
  returning :: [atom()]
) :: iodata()

Returns a DELETE for the filters returning the given returning.