use getenv

python_startup/01_load_db.py

 import os
 from dotenv import load_dotenv
-import pandas as pd
 import sqlalchemy
-from urllib.parse import quote_plus
+import pandas as pd
 
 load_dotenv("/usr/src/app/.env")
 
@@ -14,9 +13,9 @@ class Database:
         return pd.read_sql_table(table_name, self.conn)
 
 def db_connect(db_name):
-    hostname = "wi-sql.fh-muenster.de"
-    user = 'digibim'
-    password = quote_plus("Di&i$IM0815")
+    hostname=os.getenv("DB_HOST")
+    user=os.getenv("DB_USER")
+    password=os.getenv("DB_PASSWORD")
     conn = sqlalchemy.create_engine(f'postgresql+psycopg2://{user}:{password}@{hostname}/{db_name}')
     return conn