-- Inertia in five levels (2026-10-30, ADR 0007). Additive: nothing is lost.
--
-- The four words of before become levels: low → 2, standard → 3, high → 4,
-- max → 5 (level 1 is new, below them). Each word is first kept as it was, in a
-- column of its own, then its level is written in its place. The adoptions are
-- left as they are: their `params` hold the M and G each was judged by. The
-- server still reads the four words (a row written by an older image).

ALTER TABLE units ADD COLUMN inertia_legacy TEXT;            -- the word before 2026-10-30, as it was
UPDATE units SET inertia_legacy = inertia WHERE inertia IN ('low', 'standard', 'high', 'max');
UPDATE units SET inertia = CASE inertia
    WHEN 'low' THEN '2' WHEN 'standard' THEN '3' WHEN 'high' THEN '4' WHEN 'max' THEN '5' END
  WHERE inertia IN ('low', 'standard', 'high', 'max');

ALTER TABLE proposals ADD COLUMN inertia_target_legacy TEXT; -- the word before 2026-10-30, as it was
UPDATE proposals SET inertia_target_legacy = inertia_target WHERE inertia_target IN ('low', 'standard', 'high', 'max');
UPDATE proposals SET inertia_target = CASE inertia_target
    WHEN 'low' THEN '2' WHEN 'standard' THEN '3' WHEN 'high' THEN '4' WHEN 'max' THEN '5' END
  WHERE inertia_target IN ('low', 'standard', 'high', 'max');

-- Every change of the inertia of an article from now on, by a vote or by an
-- amendment of the seed: what the article says of its own inertia.
CREATE TABLE inertia_changes (
    id            INTEGER PRIMARY KEY AUTOINCREMENT,
    unit_id       TEXT NOT NULL REFERENCES units(id),
    doc_id        TEXT NOT NULL REFERENCES documents(id),
    from_level    TEXT NOT NULL,
    to_level      TEXT NOT NULL,
    cause         TEXT NOT NULL,             -- vote | amendment
    proposal_id   TEXT,                      -- the change of inertia voted
    amendment_id  TEXT,                      -- the amendment applied
    at            TEXT NOT NULL
);
CREATE INDEX inertia_changes_unit ON inertia_changes(unit_id);

-- Inertia amendments (src/inertia_amend.rs): a starting level of the seed raised
-- in an existing base, decided once per document and only on an article whose
-- inertia no vote ever changed. Each decision is kept here: applied, refused
-- (and why), or already present.
CREATE TABLE inertia_amendments (
    amendment_id  TEXT NOT NULL,
    doc_id        TEXT NOT NULL REFERENCES documents(id),
    unit_code     TEXT NOT NULL,
    from_level    TEXT,                      -- the level found
    to_level      TEXT NOT NULL,
    outcome       TEXT NOT NULL,             -- applied | refused | present
    reason        TEXT,                      -- why it was refused
    at            TEXT NOT NULL,
    PRIMARY KEY (amendment_id, doc_id)
);