An episode - a single unit of data ingested into a graph via graph.add.
graph.add
@type t() :: %Zep.Schemas.Episode{ content: String.t() | nil, created_at: String.t() | nil, graph_id: String.t() | nil, source: String.t() | nil, source_description: String.t() | nil, user_id: String.t() | nil, uuid: String.t() | nil, valid_at: String.t() | nil }