* refactor: posting datetime for SABB (backport #49710 + #50248)
Backport of #49710 "refactor: posting datetime for SABB" to
version-15-hotfix, including the regression fix#50248
"fix: missed refactoring code".
Replaces Serial and Batch Bundle's `posting_date`/`posting_time` with a
single `posting_datetime` field and updates all readers/writers; adds a
patch to populate `posting_datetime` from the linked Stock Ledger Entry
and drop the now-unused single-column indexes.
Adapted to version-15-hotfix where the surrounding stock code had already
moved to `posting_datetime` (SLE) and diverged from develop.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
* chore: fix conflicts
* chore: fixed formatting
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Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
(cherry picked from commit 98caefea88)
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