simplify connection context with transaction is opened field

peewee_async.py

@@ -78,10 +78,8 @@
 class ConnectionContext:
     def __init__(self, connection):
         self.connection = connection
-        self.transactions = []
-
-    def has_transactions(self):
-        return len(self.transactions) > 0
+        # needs for to know whether begin a transaction  or create a savepoint
+        self.transaction_is_opened = False
 
 connection_context: ContextVar[Optional[ConnectionContext]] = ContextVar("connection_context", default=None)
 
@@ -185,10 +183,8 @@ def __init__(self, connection, is_savepoint=False):
             self.savepoint = None
 
     @property
-    def name(self):
-        if self.savepoint:
-            return self.savepoint
-        return "begin"
+    def is_savepoint(self):
+        return self.savepoint is not None
 
     async def execute(self, sql):
         async with self.connection.cursor() as cursor:
@@ -248,16 +244,22 @@ async def __aexit__(self, *args):
 class TransactionContextManager(ConnectionContextManager):
     async def __aenter__(self):
         connection = await super().__aenter__()
-        self.transaction = Transaction(
-            connection, is_savepoint=self.connection_context.has_transactions()
-        )
+        begin_transaction = self.connection_context.transaction_is_opened is False
+
+        self.transaction = Transaction(connection, is_savepoint=begin_transaction is False)
         await self.transaction.__aenter__()
-        self.connection_context.transactions.append(self.transaction.name)
+
+        if begin_transaction is True:
+            self.connection_context.transaction_is_opened = True
         return connection
 
     async def __aexit__(self, exc_type, exc_value, exc_tb):
         await self.transaction.__aexit__(exc_type, exc_value, exc_tb)
-        self.connection_context.transactions.pop()
+
+        end_transaction = self.transaction.is_savepoint is False
+        if end_transaction is True:
+            self.connection_context.transaction_is_opened = False
+
         await super().__aexit__()