fix: Bugs created after the overhaul, performance and layout fixes

backend/main.py

@@ -27,7 +27,7 @@ from crm.quotations_router import router as crm_quotations_router
 from crm.nextcloud import close_client as close_nextcloud_client, keepalive_ping as nextcloud_keepalive
 from crm.mail_accounts import get_mail_accounts
 from mqtt.client import mqtt_manager
-from mqtt import database as mqtt_db
+import database as db
 from melodies import service as melody_service
 
 app = FastAPI(
@@ -88,10 +88,10 @@ async def email_sync_loop():
 @app.on_event("startup")
 async def startup():
     init_firebase()
-    await mqtt_db.init_db()
+    await db.init_db()
     await melody_service.migrate_from_firestore()
     mqtt_manager.start(asyncio.get_event_loop())
-    asyncio.create_task(mqtt_db.purge_loop())
+    asyncio.create_task(db.purge_loop())
     asyncio.create_task(nextcloud_keepalive_loop())
     sync_accounts = [a for a in get_mail_accounts() if a.get("sync_inbound") and a.get("imap_host")]
     if sync_accounts:
@@ -104,7 +104,7 @@ async def startup():
 @app.on_event("shutdown")
 async def shutdown():
     mqtt_manager.stop()
-    await mqtt_db.close_db()
+    await db.close_db()
     await close_nextcloud_client()