Populate the meta.file_date value with current time when saving.

[WilliamJamieson]

Closes #470

This PR updates the meta.file_date attribute upon file save to match the current time (and makes sure it matches the time indicated by the filesystem).

Tasks

• Update or add relevant roman_datamodels tests.
• Update relevant docstrings and / or docs/ page.
• Does this PR change any API used downstream? (If not, label with no-changelog-entry-needed.)
  • Write news fragment(s) in changes/: echo "changed something" > changes/<PR#>.<changetype>.rst (see below for change types).
  • Start a romancal regression test (https://github.com/spacetelescope/RegressionTests/actions/workflows/romancal.yml) with this branch installed ("git+https://github.com/<fork>/rad@<branch>").

News fragment change types:

• changes/<PR#>.feature.rst: new feature
• changes/<PR#>.bugfix.rst: fixes an issue
• changes/<PR#>.doc.rst: documentation change
• changes/<PR#>.removal.rst: deprecation or removal of public API
• changes/<PR#>.misc.rst: infrastructure or miscellaneous change

[WilliamJamieson]

Note that this includes tiny fixes I noticed in the datamodels subpackage.

[codecov]

Codecov Report

❌ Patch coverage is 96.36364% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.54%. Comparing base (087a60d) to head (98172dd).
⚠️ Report is 209 commits behind head on main.

Files with missing lines	Patch %	Lines
src/roman_datamodels/datamodels/_utils.py	92.85%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #539      +/-   ##
==========================================
- Coverage   97.56%   97.54%   -0.02%     
==========================================
  Files          30       40      +10     
  Lines        2788     4359    +1571     
==========================================
+ Hits         2720     4252    +1532     
- Misses         68      107      +39     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[schlafly]

That looks good. We'll need the romancal PR so that this can pass regtests, but I see that one as well. The regression tests are currently down to the grism / prism issue, which will require a new regtest generation, though the code for generating those is also having issues due to a github runner issue---when it rains, it pours.

Happy to merge this one when a regtest run with this and the accompanying romancal PR shows only the expected grism / prism errors. For what it's worth, I'm happy with doing only the meta.file_date part and not the modification time part; I expect the modification times to change again when the files go to the archive and when the files return from the archive and are opened by users, so I don't worry about those bouncing around.

[WilliamJamieson]

@braingram are you happy with these changes?

[WilliamJamieson]

With spacetelescope/romancal#1841 this passes. https://github.com/spacetelescope/RegressionTests/actions/runs/16350124575/job/46194523910

[WilliamJamieson]

Regression tests still pass https://github.com/spacetelescope/RegressionTests/actions/runs/16422656955/job/46405106391

[braingram]

Thanks! LGTM. Waiting on approval until @PaulHuwe gets the thumbs up from archive folks to restart work on rad/rdm.