Изменил логику работы курсора

endpoint.py

@@ -110,7 +110,6 @@ class Endpoint(Thread):
 
         # база данных
         self.connection = None
-        self.cursor = None
         self.db_table = config['database']['db-table']
         self.db_col_names = ''
         for rn in self.ranges:
@@ -135,9 +134,10 @@ class Endpoint(Thread):
         return values
 
     def __read_last_db_regs(self):
-        self.cursor.execute(f"select {self.db_col_names} from `{self.db_table}`"
+        with self.connection.cursor() as cursor:
+            cursor.execute(f"select {self.db_col_names} from `{self.db_table}`"
                            f"order by `{self.config['database']['db-datetime-col']}` desc limit 1;")
-        row = self.cursor.fetchall()
+            row = cursor.fetchall()
             if len(row) != 0:
                 return row[0]
             else:
@@ -153,7 +153,8 @@ class Endpoint(Thread):
 
         query = f"insert into `{self.db_table}` ({self.db_col_names}) values ({vals_str});"
         journal.log(f"Executing query: {query}")
-        self.cursor.execute(query)
+        with self.connection.cursor() as cursor:
+            cursor.execute(query)
 
     def __endless_loop(self):
         # if self.log_type == 'on-change':
@@ -217,8 +218,7 @@ class Endpoint(Thread):
                 database=self.config["database"]["db-name"]
         ) as _connection:
             self.connection = _connection
-            with self.connection.cursor() as cursor:
-                self.cursor = cursor
 
             # запуск бесконечного цикла
             self.__endless_loop()
+