[bingdongni]

A timezone-aware value returned by a database driver loses its offset when a session is reloaded. For example, 2024-01-02 03:04:00+05:30 is resumed as 2024-01-02 03:04:00.

Store the observed UTC offset, DST offset, name and fold with datetime and time values. On reload the timezone is a fixed snapshot; its original transition rules are not reconstructed. Older session values remain readable, although offsets already omitted by older versions cannot be recovered.

Tests:

• Python 3.12: 2,752 tests run, 16 skipped.
• PyPy 2.7 on Windows: 2,744 tests run, 37 skipped, excluding test_replication. That module has six SQLite teardown errors on this platform, also reproduced on unmodified master.
• Pyflakes and git diff --check on the changed files.

[stamparm]

Thanks for finding this. Fixed in a smaller way (bf8b995): time zone aware values are now stored as their displayed text, so the deserializer doesn't need to grow (it's the hardened replacement for pickle, which I'd rather keep minimal).