FaunaDB query to handle run stats (from server.js in CodeRush repo)

server.js

    try {
      const qResponse = await client.query(
        [
          q.Select(['data', 'total'],
            q.Let(
              {
                lang: q.Get(q.Match(q.Index('languageByIndex'), main.languageIndex)),
                ref: q.Select(['ref'], q.Var('lang')),
              },
              q.Update(q.Var('ref'),
                {
                  data: {
                    total: q.Add(q.Select(['data', 'total'], q.Var('lang')), 1),
                  },
                },
              ),
            ),
          ),

          // recalculate max
          q.Select(['data', 'value'],
            q.Let(
              {
                doc: q.Get(q.Match(q.Index('statByName'), 'best')),
                ref: q.Select(['ref'], q.Var('doc')),
              },
              q.Update(q.Var('ref'),
                {
                  data: {
                    value: q.Max([q.Select(['data', 'value'], q.Var('doc')), main.wpm]),
                  },
                },
              ),
            ),
          ),

          // save run
          q.Create(
            q.Collection('runs'),
            {
              data: main,
            },
          ),

          // calculate avg
          q.Select(['data', 'value'],
            q.Let(
              {
                doc: q.Get(q.Match(q.Index('statByName'), 'avg')),
                ref: q.Select(['ref'], q.Var('doc')),
              },
              q.Update(q.Var('ref'),
                {
                  data: {
                    value: q.Round(
                      q.Select(
                        ['data', 0],
                        q.Mean(
                          q.Map(
                            q.Paginate(q.Match(q.Index('runsWpmByDate')), { size: 100 }),
                            q.Lambda(['ts', 'wpm'], q.Var('wpm')),
                          ),
                        ),
                      ),
                      1, // precision
                    ),
                  },
                },
              ),
            ),
          ),

          // totalStats
          q.Map(
            Object.entries(misc),
            q.Lambda(
              ['name', 'value'],
              q.Let(
                {
                  ret: q.Let(
                    {
                      doc: q.Get(q.Match(q.Index('statByName'), q.Var('name'))),
                      ref: q.Select(['ref'], q.Var('doc')),
                    },
                    q.Update(q.Var('ref'),
                      {
                        data: {
                          value: q.Add(q.Select(['data', 'value'], q.Var('doc')), q.Var('value')),
                        },
                      },
                    ),
                  ),
                },
                [
                  q.Select(['data', 'name'], q.Var('ret')),
                  q.Select(['data', 'value'], q.Var('ret')),
                ],
              ),
            ),
          ),
        ],
      );

      let statsResponse;
      [database.languages[main.languageIndex].total, database.stats.best, , database.stats.avg, statsResponse] = qResponse;

      database.stats = {
        ...database.stats,
        ...Object.fromEntries(statsResponse),
      };

      updateDatabaseCache();
      res.sendStatus(200);
    }