Use logger?? for daily viewer

There are left-over debugging statements like this:
```
Apr 28 12:48:00 syzygy gunicorn[349864]: csd_data(2430, 0, 9, user)
```
which can be useful to have but are `print()` statements instead of using the normal log. So they get buffered by systemd and usually only show up when the server exits and the buffers get flushed.

Search the repository for the print() statements producing messages such as csd_data(2430, 0, 9, user), then inspect how the daily viewer's normal logger is configured and used. Replace the debugging output with that logger and verify that the messages appear promptly in the server logs rather than only after shutdown.

Written by the indexing model from the issue text.