My first timelapse project plan (1 year) - anything I'm missing? Also, how long can I safely keep my camera powered ON in power saving mode while it's plugged into the wall?

I want to create a very long-term timelapse video of a science experiment. The subject of the timelapse will be the evolution of a sample of soil in a sterile beaker over the course of a year. Considering this is such a boring and non-changing subject, I anticipate this will be fairly easy to pull off... Still, I wanted to run my plan by the experts on this forum to see if anyone had any suggestions or warnings that what I'm about to do will be a huge waste of time.

Here's my plan:

Enclosure

I intend to build a wooden enclosure for the soil sample and camera. The inside of the box will be gessoed white.

I will add a recessed LED light to the top of the box. This light will be plugged into the wall and not run off battery power so I will never have to change batteries. I want to try to keep this as the sole source of light, so I'll be keeping the camera inside the enclosure and wrapping the whole box in black felt to keep the light from the outside from getting in.

I'm going to install a threaded camera tripod mount to the bottom of the enclosure where the camera will be positioned so that if the box is jostled a bit, it won't affect the angle of the photos.

Camera

I have a Nikon D3200. It's the only camera I have other than an old GoPro. I can set the camera mode to manual and make sure the photos are well-exposed. Then, I can just keep it as it is and let the timelapse run.

To keep the camera powered over the course of the year, I'm going to buy a continuous wall-powered battery bank with an AC adapter. There are a few reasonably-priced 3rd party examples of this on Amazon. I won't post a link because I don't want to give them any free advertisements, but based on the reviews it sounds like these will work fine.

Intervalometer

The intended interval is 1 photo per day. It's probably best that it's taken at the same time every day, before anyone wakes up and before the sun rises to make sure there is absolutely no outside sources of light in the photos. 4AM should be fine.

However, I have a major problem with this piece of gear: I haven't been able to find an intervalometer that can be plugged directly into the wall. They all take batteries. I'm not sure how long these batteries last, but I don't really want to risk it - I'd prefer if the intervalometer could be powered directly from the grid. Any recommendations?

I have found a potential DIY solution that I might be able to retrofit to take wall plug power (https://www.instructables.com/Intervalometer/), but an easier and cheaper solution is preferred.

A question:

I'm not totally clear on whether it's healthy for a DSLR camera to be continuously on for 1 year. My D3200 has an LCD screen that is automatically turned off after ~30 seconds of inactivity, but as long the on-off button is switched to ON, and the zoom lens is zoomed out, a picture can be taken. Also, when I look through the viewfinder, the digital indicators of exposure and battery life are off until I lightly hold the shutter button - so even the viewfinder lights are in low-power mode. Even still, is it bad for the camera's health to be continuously ON for over a year?