Bug: Checks for invalid characters when creating unit

[i-oden]

Note: The migrations has added changes to the db that were not made in this PR, but the previous changes were not recognized by albemic before I added compare_type=True.

• Tests passing
• Black formatting
• [ - ] Migrations for any changes to the database schema
• Rebase/merge the dev branch
• Note in the CHANGELOG

[codecov]

Codecov Report

Merging #1154 (8f786a1) into dev (67b8e86) will decrease coverage by 0.33%.
The diff coverage is 12.50%.

@@            Coverage Diff             @@
##              dev    #1154      +/-   ##
==========================================
- Coverage   82.61%   82.28%   -0.34%     
==========================================
  Files          29       29              
  Lines        3428     3443      +15     
==========================================
+ Hits         2832     2833       +1     
- Misses        596      610      +14     

Impacted Files	Coverage Δ
dds_web/__init__.py	47.94% <6.66%> (-2.46%)	⬇️
dds_web/database/models.py	94.28% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 67b8e86...8f786a1. Read the comment docs.