Comment/Comments tag's "Created At" and "Updated At" reset to 0 after enable sync

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What Happened?

After enabling sync and re-downloading from the sync server, the "Created At" and "Updated At" timestamps of the Comment/Comments tag are reset to 0. See the reproduction steps below.

Reproduce the Bug

1. Go to "All graphs" and create a new graph.
2. Enable Logseq Sync. cmd+k search "tag", go to the #Tag page, noticed the Comment and Comments tag all has the correct creation and last modified time.
3. In "All graphs" page, select "Delete local graph" from the three dot menu, then re-download it from the sync server.
4. Go to the #Tag page again, the creation and last modified time for Comment and Comments tag all reset to 0.

Expected Behavior

The creation and last modified time should remain unchanged.

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Browser, Desktop or Mobile Platform Information

Windows 11, 2.0.1-alpha+nightly.20260728, commit 9a11243.
Also can reproduce on test.logseq.com.
Uses self-hosted sync server.

Additional Context

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Are you willing to submit a PR? If you know how to fix the bug.

• I'm willing to submit a PR (Thank you!)

Start by reproducing the issue through All graphs, Logseq Sync, and the #Tag page, including a re-download from the self-hosted sync server. Trace how Comment and Comments tag timestamps are handled during sync and verify that Created At and Updated At remain unchanged after deleting and re-downloading the local graph.