Taglist api returns a null string when an article exists without a taglist + performance once db grows

[quantuminformation]

I have the following data for articles:

When running this query:
const tags = (await ds.createQuery(namespace, 'Article').select('tagList').run())[0];

Will return

I feel that we should not return this null item. Or the client should handle it.

what do you think?

[quantuminformation]

Also, this query will retrieve every taglist from every article. Would it not be better to filter them at the db level instead of performing the filtering on the cloud function.

  async getAllTags() {
    const tags = (await ds.createQuery(namespace, 'Article').select('tagList').run())[0];
    const dedupeObj = {};
    for (let i = 0; i < tags.length; ++i) {
      dedupeObj[tags[i].tagList] = 1;
    }
    return Object.keys(dedupeObj);
  },