Added new modules and updated existing logic

dev/backend/HotlinePlanner profile pic and bg worker/appsettings.json

@@ -5,5 +5,8 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
+  "ConnectionStrings": {
+    "DefaultConnection": "Host=localhost;Database=hotline_planner_db;Username=hotline_planner;Password=iE8Jcx7EwhcMZ2cO"
+  },
   "AllowedHosts": "*"
-}
+}