Use buffers and filter out sensors w/o data.
Merge pull request #289 from MastodonC/feature/fix-channels

Use buffers and filter out sensors w/o data.
Fix editable on parse-entities.
Update can-add-* based on history

In addition to fetching. We don't fetch at the right level to update
can-add-* only when we are fetching.
Removed unneeded logging.
Merge pull request #297 from MastodonC/feature/authn-fixes

Fix authn rules
Pass only relevant cursor to each component.
Add channel to datepicker
Fix fetching data.
Remove logging.