Today's usage counters. Snapshot reflects the in-memory rollup; counts reset at UTC midnight.
@type t() :: %Spatio.Model.AccountUsage{ api_calls: integer() | nil, date: String.t(), email_sends: integer() | nil, files_count: integer() | nil, notes_count: integer() | nil, sheets_count: integer() | nil, slides_count: integer() | nil, tasks_count: integer() | nil }