Remove outdated method from database

src/api/database/database.py

@@ -715,31 +715,6 @@ class DbConnectionPool:
                     pass
             self._on_connection_released(True, connection)
     
-    @contextmanager
-    def start_read_transaction(self) -> ReadTransaction:
-        """
-        Starts a read-only transaction.
-        
-        May raise :class:`NoAvailableConnectionError`
-        """
-        transaction = None
-        try:
-            if self._factory.supports_per_transaction_writeable_flag():
-                connection = self._cache.get_connection()
-            else:
-                connection = self._read_cache.get_connection()
-            transaction = ReadTransaction(lambda: self._on_connection_released(False, connection), connection)
-            yield transaction
-            if not transaction.is_closed():
-                print("Warning: Rolling open transaction back after execution but there was no exception (Always "
-                      "close the transaction explicitly)")
-                transaction.close()
-        except Exception:
-            if transaction is not None and not transaction.is_closed():
-                _COUNTERS_TRANSACTION_ABORTED_BY_USER["read"].trigger()
-                transaction.on_error_close_transaction()
-            raise
-    
     def execute_read_statement_in_transaction(self,
                                               statement: PreparedStatement or str,
                                               *values: DbValueType) -> DbResultSet: