-- +goose Up
-- 人工修订账本与正文投影不是同一个存储。投影意图与账本同一事务写入，
-- 投影成功后才标 projected。进程在两次写之间退出时，未投影行仍可重放。

CREATE TABLE IF NOT EXISTS document_content_projections (
    doc_id           TEXT NOT NULL,
    snapshot_id      BIGINT NOT NULL,
    revision_no      INT NOT NULL,
    idempotency_key  TEXT NOT NULL DEFAULT '',
    status           TEXT NOT NULL DEFAULT 'pending',
    created_at       TIMESTAMPTZ NOT NULL DEFAULT now(),
    projected_at     TIMESTAMPTZ,
    PRIMARY KEY (doc_id, snapshot_id),
    CONSTRAINT chk_doc_content_projection_status CHECK (status IN ('pending', 'projected'))
);

CREATE INDEX IF NOT EXISTS idx_doc_content_projection_pending
    ON document_content_projections (created_at)
    WHERE status = 'pending';

-- +goose Down
DROP TABLE IF EXISTS document_content_projections;