qw-gallery-scenery/pages/stats.tsx

import React from 'react';
import db_ops from '../server/helpers/db_ops'
import AppBar from '../components/AppBar'
import { GetStaticProps } from 'next'

// eslint-disable-next-line @typescript-eslint/no-explicit-any
export default function Index(props: any) {
  return (
    <div>
      <AppBar />
      <div>Total Images: {props.number_of_images}</div>
      <div>Total Authors: {props.number_of_authors}</div>
      <div>Total Tags: {props.number_of_tags}</div>
      <div>Images deleted: {props.number_of_deleted}</div>
      <div>ID of the last image: {props.last_image_id}</div>
    </div>
  );
}

export const getStaticProps: GetStaticProps = async () => {
  const imgs = await db_ops.image_ops.get_all_images()
  const authors = new Set()
  const tags = new Set()
  const id_of_last_image=imgs[imgs.length-1].id
  for (const img of imgs) {
    authors.add(img.author)
    for (const tag of img.tags) {
      tags.add(tag)
    }
  }
  return {
    props: {
      number_of_images: imgs.length,
      number_of_authors: authors.size,
      number_of_tags: tags.size,
      number_of_deleted:id_of_last_image-imgs.length,
      last_image_id:id_of_last_image
    },
    revalidate:5*60 //5 min
  }
}