fix: api descript

desc/sql/shop/shop_invitations.sql

@@ -0,0 +1,20 @@
+CREATE TABLE shop_invitations
+(
+    id           BIGINT PRIMARY KEY,
+    shop_id      BIGINT      NOT NULL REFERENCES shops (id),
+    player_id    BIGINT      NOT NULL,
+    status       VARCHAR(20) NOT NULL DEFAULT 'pending',
+    invited_by   BIGINT      NOT NULL,
+    created_at   TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    responded_at TIMESTAMPTZ,
+
+    CONSTRAINT chk_invitation_status CHECK (status IN ('pending', 'accepted', 'rejected', 'cancelled'))
+);
+
+CREATE UNIQUE INDEX idx_unique_pending_invitation
+    ON shop_invitations (shop_id, player_id)
+    WHERE status = 'pending';
+CREATE INDEX idx_invitations_shop ON shop_invitations (shop_id);
+CREATE INDEX idx_invitations_player ON shop_invitations (player_id) WHERE status = 'pending';
+CREATE INDEX idx_invitations_player_status ON shop_invitations (player_id, status, created_at DESC);
+CREATE INDEX idx_invitations_shop_status ON shop_invitations (shop_id, status, created_at DESC);