Expose modify_time on LPath

[open-inspect-latchbio]

Summary

Exposes the modify_time metadata field on LPath, following the same pattern as the existing version_id, content_type, and size getters.

Changes

• Added modify_time: Optional[datetime] to the internal _Cache.
• Fetched modifyTime from ldataObjectMeta in the fetch_metadata GraphQL query.
• Parsed the ISO 8601 timestamp into a datetime (normalizing a possible Z suffix, since datetime.fromisoformat only supports it on Python 3.11+, while the SDK targets >=3.9).
• Cleared modify_time in _clear_cache.
• Added a modify_time(*, load_if_missing=True) -> Optional[datetime] getter mirroring version_id.
• Bumped version to 2.76.9 and added a changelog entry.

Usage

from latch.ldata.path import LPath

lp = LPath("latch://.../file.txt")
print(lp.modify_time())  # datetime with tzinfo, or None

Notes

The backing column modify_time (timestamp with time zone) exists on app_public.ldata_object_meta in vacuole and is exposed by Postgraphile as modifyTime.