fix: api descript

desc/sql/shop/shop_players.sql

@@ -0,0 +1,20 @@
+CREATE TABLE shop_players
+(
+    shop_id    BIGINT      NOT NULL REFERENCES shops (id),
+    player_id  BIGINT      NOT NULL,
+
+    -- 标记是否为主店铺。用于个人主页展示和 players.shop_id 缓存源
+    is_primary BOOLEAN              DEFAULT FALSE,
+    joined_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    left_at    TIMESTAMPTZ, -- 软删除，表示已离职
+
+    PRIMARY KEY (shop_id, player_id)
+);
+
+-- 索引
+CREATE INDEX idx_shop_players_player ON shop_players (player_id) WHERE left_at IS NULL;
+CREATE INDEX idx_shop_players_shop_active ON shop_players (shop_id, joined_at DESC) WHERE left_at IS NULL;
+
+-- [新增] 唯一索引：确保一个打手同一时间只能有一个主店铺
+CREATE UNIQUE INDEX idx_shop_players_one_primary
+    ON shop_players (player_id) WHERE is_primary = TRUE AND left_at IS NULL;