-- The looks of an open condition are kept here, not in the conditions bucket (novox/hq issue 420, ADR 0289
-- §1 and §4).
--
-- On 2026-10-10 the bus had stored 131 647 writes to the conditions bucket in four days while twelve
-- conditions were open: every look rewrote a condition's value, because the value carried how many times it
-- had been observed, when last and the newest evidence. A watcher heard a write for every look, not for
-- every change. The bucket now holds what a condition says, written when that changes; how often and when
-- it was last seen, and what each look said, change on every look and are kept in this row, written by the
-- serving controller under its lease (`epoch`) and read back by `conditions` and the events it says.
--
-- One row per open condition, removed when it clears. `evidence` is the newest observations, newest first,
-- as the condition's `evidence` says them: [{"at", "said"}].
create table condition_looks (
    key           text        primary key,
    observations  integer     not null check (observations >= 0),
    last_observed timestamptz not null,
    evidence      jsonb       not null default '[]',
    epoch         bigint,
    kept_at       timestamptz not null default now()
);