Function execute_batch 

pub async fn execute_batch<T, I, F, Fut>(
    items: I,
    max_concurrency: usize,
    operation: F,
) -> Vec<Result<T, String>>
where
    I: IntoIterator,
    F: Fn(I::Item) -> Fut + Clone + Send + 'static,
    Fut: Future<Output = Result<T, String>> + Send + 'static,
    T: Send + 'static,
    I::Item: Send + 'static,

Helper for executing a batch of similar operations concurrently.

This is a convenience function for common patterns like fetching metadata for multiple tables.