pub fn custom_index(
  db_state: state.DbState,
  var: String,
  index_name: String,
  query: state.IndexQuery,
  threshold: Float,
  ctx: dict.Dict(String, fact.Value),
  as_of_tx: option.Option(Int),
  as_of_valid: option.Option(Int),
) -> List(dict.Dict(String, fact.Value))

pub fn similarity(
  db_state: state.DbState,
  var: String,
  vec: List(Float),
  threshold: Float,
  ctx: dict.Dict(String, fact.Value),
  as_of_tx: option.Option(Int),
  as_of_valid: option.Option(Int),
) -> List(dict.Dict(String, fact.Value))

pub fn similarity_entity(
  db_state: state.DbState,
  var: String,
  vec: List(Float),
  threshold: Float,
  ctx: dict.Dict(String, fact.Value),
) -> List(dict.Dict(String, fact.Value))