Suggestion to organize the variables

[CaetanoGS]

Here you have Global variables directly on the class file, I would suggest to include it as global variables in your container, and extract them using something like https://pypi.org/project/python-dotenv/

PATH_TO_KEYS = "/app/spotiplot.env"
DEBUG_STATE = False
LOOP_SLEEP = 3

Regarding the DB, you can do the same that you did here db_pass = os.getenv("MYSQL_PASSWORD") for all of the variables, then you just need to configure your container without changing code. It makes easier to deploy and maintain the application.

db_config = {
"user": "os.getenv("MYSQL_USER")",
"password": db_pass,
"host": "os.getenv("MYSQL_HOST")",
"port": os.getenv("MYSQL_PORT"),
"database": "os.getenv("MYSQL_DATABASE")",
}