DBConnection.Ownership.ownership_checkin

You're seeing just the function ownership_checkin, go back to DBConnection.Ownership module for more information.
Link to this function

ownership_checkin(manager, opts)

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Specs

ownership_checkin(GenServer.server(), Keyword.t()) ::
  :ok | :not_owner | :not_found

Checks a connection back in.

A connection can only be checked back in by its owner.