Refactor database message handling to support multiple messages and enhance type hints across various classes

src/ui/widgets/graph.py

@@ -1,5 +1,5 @@
 import random
-from typing import Union
+from typing import Union, Any
 
 import pyqtgraph as pg
 from PyQt6 import QtWidgets
@@ -12,8 +12,8 @@ log.add(sys.stdout)
 log.add("logs/application.log", rotation="1 MB", retention="10 days")
 
 
-def mergedicts(d1, d2):
-    res = {}
+def mergedicts(d1: dict[str, Any], d2: dict[str, Any]):
+    res: dict[str, Any] = {}
     d1_data = list(d1.items())
     d2_data = list(d2.items())
     for i in range(len(d1)):
@@ -24,18 +24,18 @@ def mergedicts(d1, d2):
         d1_dict = dict([d1_data_slice])
         d2_dict = dict([d2_data_slice])
         # merge the dicts
-        res.update(d1_dict)
-        res.update(d2_dict)
+        res.update(d1_dict)  # type: ignore
+        res.update(d2_dict)  # type: ignore
     return res
 
 
 class DataGraph(QtWidgets.QWidget):
     def __init__(
         self,
-        title,
-        data=Union[dict[list, list] | dict[list[dict[str, list]]]],
-        generateMissing=False,
-        label=None,
+        title: str,
+        data=Union[dict[list, list], dict[list[dict[str, list[Any]]]]],
+        generateMissing: bool = False,
+        label: str = None,
     ):
         super().__init__()
         log.debug(