-- Eventos cronologicos por card. Complementa column_history (moves) y lock_history (locks).
-- Captura: created, assigned, unassigned, title_changed, description_changed, color_changed, tags_changed.
CREATE TABLE IF NOT EXISTS card_events (
    id         TEXT PRIMARY KEY,
    card_id    TEXT NOT NULL REFERENCES cards(id) ON DELETE CASCADE,
    kind       TEXT NOT NULL,
    actor_id   TEXT,
    payload    TEXT NOT NULL DEFAULT '{}',
    created_at TEXT NOT NULL
);
CREATE INDEX IF NOT EXISTS idx_card_events_card ON card_events(card_id, created_at);