Remove unused imports and clean up code structure across multiple files

src/backend/semester.py

@@ -6,7 +6,7 @@ from loguru import logger as log
 
 logger = log
 logger.remove()
-logger.add("logs/application.log", rotation="1 week", enqueue=True)
+logger.add("logs/application.log", rotation="1 week", retention="1 month", enqueue=True)
 
 
 # logger.add(sys.stderr, format="{time} {level} {message}", level="INFO")

src/backend/thread_bookgrabber.py

@@ -8,7 +8,9 @@ from loguru import logger as log
 
 logger = log
 logger.remove()
-logger.add("logs/bookgrabber_thread.log", rotation="1 week", enqueue=True)
+logger.add(
+    "logs/bookgrabber_thread.log", rotation="1 week", retention="1 month", enqueue=True
+)
 log.add(
     "logs/application.log",
     rotation="1 day",

src/backend/threads_autoadder.py

@@ -10,10 +10,12 @@ import sys
 
 logger = log
 logger.remove()
-logger.add("logs/application.log", rotation="1 week", enqueue=True)
-log.add(
+logger.add("logs/application.log", rotation="1 week", retention="1 month", enqueue=True)
+logger.add(
     "logs/autoadder.log",
     compression="zip",
+    rotation="1 week",
+    retention="1 month",
 )
 
 # logger.add(sys.stderr, format="{time} {level} {message}", level="INFO")

src/backend/threads_availchecker.py

@@ -14,7 +14,7 @@ import sys
 
 logger = log
 logger.remove()
-logger.add("logs/application.log", rotation="1 week", enqueue=True)
+logger.add("logs/application.log", rotation="1 week", retention="1 month", enqueue=True)
 log.add(
     "logs/availthread.log",
 )