pub fn diff(
  db_state: state.DbState,
  from_tx: Int,
  to_tx: Int,
) -> List(fact.Datom)

pub fn entity_history(
  db_state: state.DbState,
  eid: fact.EntityId,
) -> List(fact.Datom)

pub fn filter_active(
  datoms: List(fact.Datom),
  db_state: state.DbState,
) -> List(fact.Datom)

pub fn filter_by_time(
  datoms: List(fact.Datom),
  tx_limit: option.Option(Int),
  valid_limit: option.Option(Int),
) -> List(fact.Datom)

pub fn pull(
  db_state: state.DbState,
  eid: fact.EntityId,
  pattern: List(ast.PullItem),
) -> query_types.PullResult

pub fn pull_result_to_value(
  res: query_types.PullResult,
) -> fact.Value