create table rate_to_all_responses (
  base text references currencies not null,
  rates ,
  timestamp bigint not null
);
comment on table rate_to_all_responses is '
  flowerate response for exchange rate for base currency to all currencies
';

comment on column rate_to_all_responses.base is '
  base currency
';
comment on column rate_to_all_responses.rates is '
  target currencies
';
comment on column rate_to_all_responses.timestamp is '
  epoch timestamp of returned exchange rate
';