DBPollEng is a virtual interface providing a mechanism to track and deliver database object changes to external services which can be used in production services as simple MQ replacement * * Methods: * - InitCursor - creates all the needed meta-tables, must be called in the beginning of test * - CleanupCursor - removes all the polling-engine specific data * - InsertObjCursor - must be created when a pollable object is created in 'obj_table_name' table * - UpdateObjCursorByUUID - must be called when a pollable object is updated and object UUID is known in the main transaction * - UpdateObjCursorByID - must be called when a pollable object is updated and object ID is known in the main transaction */.