-- Per-page row for each uploaded chapter. The reader needs to know each
-- page's storage key (extensions can vary across pages within a chapter
-- because uploads sniff and preserve per-image MIME), so we store one
-- row per page rather than re-deriving keys from a fixed pattern.

CREATE TABLE pages (
    id            uuid PRIMARY KEY DEFAULT gen_random_uuid(),
    chapter_id    uuid NOT NULL REFERENCES chapters(id) ON DELETE CASCADE,
    page_number   integer NOT NULL,
    storage_key   text NOT NULL,
    content_type  text NOT NULL,
    UNIQUE (chapter_id, page_number)
);

CREATE INDEX pages_chapter_idx ON pages (chapter_id, page_number);