Function addChildToParentInCache

site/src/api/queries/chats.ts:161–177

(
	queryClient: QueryClient,
	child: TypesGen.Chat,
	parentId: string,
)

 * the child is silently dropped (it will appear when the parent loads).
 */
export const addChildToParentInCache = (
	queryClient: QueryClient,
	child: TypesGen.Chat,
	parentId: string,
) => {
	updateInfiniteChatsCache(queryClient, (chats) => {
		let changed = false;
		const next = chats.map((c) => {
			if (c.id !== parentId) return c;
			// Avoid duplicates.
			if (c.children?.some((ch) => ch.id === child.id)) return c;
			changed = true;
			return { ...c, children: [child, ...(c.children ?? [])] };
		});
		return changed ? next : chats;
	});
};

/**
 * Updates a child chat within its parent's `children` array across all