A typed edge between two notes of one scope (memory_links table): related, derived_from or supersedes. A supersedes edge also sets superseded_by_id on the older note.
memory_links
related
derived_from
supersedes
superseded_by_id
@type t() :: %SuperPi.Durable.Schemas.MemoryLink{ __meta__: term(), created_seq: term(), from_id: term(), id: term(), inserted_at: term(), rel: term(), to_id: term() }