-- Squad manager assignment: an owned item assigned as a squad's manager.
--
-- Generic, game-neutral canonical state. Core does not know what a "manager"
-- means to any game; it only records that one owned item (`owned_card_id`) is
-- assigned to a squad in the manager role. The FIFA 17 adapter owns the wire
-- meaning (itemType "manager", contract, chemistry) exactly as it owns player
-- item shaping — Core just persists the ownership-backed assignment durably and
-- atomically, so a manager survives squad save / reload / server restart.
--
-- One manager per squad: `squad_id` is the primary key, so a re-assignment
-- REPLACEs rather than accumulating (no duplicate-manager rows).
--
-- `owned_card_id` references `owned_cards(id)` with ON DELETE CASCADE: quick
-- selling / discarding the manager card (a DELETE on owned_cards) removes the
-- assignment automatically, so a sold manager is never resurrected on the next
-- squad read. Reads additionally re-check the manager still belongs to the club
-- (see `club::get_squad_manager`), defending against a stale row left by a
-- market transfer (which UPDATEs owner rather than deleting).
CREATE TABLE IF NOT EXISTS squad_managers (
    squad_id      TEXT PRIMARY KEY NOT NULL REFERENCES squads(id) ON DELETE CASCADE,
    owned_card_id TEXT NOT NULL REFERENCES owned_cards(id) ON DELETE CASCADE,
    updated_at    TEXT NOT NULL
);

CREATE INDEX IF NOT EXISTS idx_squad_managers_owned ON squad_managers(owned_card_id);