-- A model's proposal for a mission's PHASES, and whether a human accepted it.
--
-- The sibling of `mission_team_proposals` (0070), and deliberately the same
-- shape: propose, review, approve, apply. That one lets a model size the team;
-- this one lets a model decide what the work actually IS — the phases, their
-- order, and what each must satisfy.
--
-- What it replaces: five hand-written recipes in `templates/workflows/*.toml`,
-- one of which every mission picks wholesale. A recipe is a fixed answer to
-- "what phases does this kind of mission have", written before anyone saw the
-- mission — which is the "do it this way: 1, 2, 3" over-specification that
-- makes a capable model follow a worse plan than it would have chosen. The
-- recipes stay: they remain the default for a mission nobody proposes a plan
-- for, and the fallback when a proposal is refused.
--
-- `status` matches 0070 exactly, including the partial unique index: two
-- approved plans would be two answers to "what is this mission", and the phase
-- table holds one.
CREATE TABLE IF NOT EXISTS mission_plan_proposals (
    id           UUID        PRIMARY KEY,
    mission_id   UUID        NOT NULL REFERENCES missions (id) ON DELETE CASCADE,
    workspace_id UUID        NOT NULL,
    -- {"phases": [{kind, task, done_when?, done_when_check?, allow_empty?}, ...]}
    -- Order is the array's own order; a model that also emits `order_idx` would
    -- give two sources for one fact.
    plan         JSONB       NOT NULL,
    author_model TEXT        NOT NULL,
    status       TEXT        NOT NULL DEFAULT 'proposed'
                             CHECK (status IN ('proposed', 'approved', 'rejected')),
    note         TEXT,
    created_at   TIMESTAMPTZ NOT NULL DEFAULT now(),
    decided_at   TIMESTAMPTZ,
    decided_by   UUID
);

CREATE INDEX IF NOT EXISTS mission_plan_proposals_mission_idx
    ON mission_plan_proposals (mission_id, created_at DESC);

CREATE UNIQUE INDEX IF NOT EXISTS mission_plan_proposals_one_approved
    ON mission_plan_proposals (mission_id)
 WHERE status = 'approved';