Running on @karlicoss desktop PC, =python3.10= (under docker)

- dumping via cachew NTBinder, using regular sqlalchemy insert statement

#+begin_example
$ python3 -m pytest --import-mode=importlib --pyargs promnesia.tests -s -k 'gc_off and benchmark and 100000'
12.90s call     src/promnesia/tests/test_db_dump.py::test_benchmark_visits_dumping[gc_off-100000]
PASSED src/promnesia/tests/test_db_dump.py::test_benchmark_visits_dumping[gc_off-100000]
#+end_example


- dumping via cachew NTBinder, using dbengine to insert directly -- massive speedup (added a test with 1M visits too)
#+begin_example
$ python3 -m pytest --import-mode=importlib --pyargs promnesia.tests -s -k 'gc_off and benchmark and 100000'
0.85s call     src/promnesia/tests/test_db_dump.py::test_benchmark_visits_dumping[gc_off-100000]
8.23s call     src/promnesia/tests/test_db_dump.py::test_benchmark_visits_dumping[gc_off-1000000]
#+end_example
