fix(#152): match issued_at default to naive column schema

[Anubhav-2003]

The issued_at column is defined as a timezone-naive DateTime, but
its default value (datetime.now(timezone.utc)) was returning a
timezone-aware object.

While some database drivers silently fix this mismatch for us behind
the scenes, stricter ones will immediately crash with a TypeError
during inserts.

This commit fixes the root problem by explicitly removing the timezone
info (.replace(tzinfo=None)) before the value hits the database.
This ensures the data perfectly matches the expected column schema,
preventing crashes across different environments. A regression test
has also been added.

[coveralls]

Coverage Report for CI Build 25058656330

Warning

No base build found for commit 1956003 on main.
Coverage changes can't be calculated without a base build.
If a base build is processing, this comment will update automatically when it completes.

Coverage: 95.115%

Details

• Patch coverage: 8 of 8 lines across 3 files are fully covered (100%).

Uncovered Changes

No uncovered changes found.

Coverage Regressions

Requires a base build to compare against. How to fix this →

---

Coverage Stats

Relevant Lines:	5384
Covered Lines:	5121
Line Coverage:	95.12%
Coverage Strength:	9.44 hits per line

---

💛 - Coveralls

[winwinashwin]

There are a bunch of test cases where we are passing datetime.now(...) as defaults when creating models for unit tests. Let's also refactor those to make them offset naive?

Also, another minor note - the autolink reference to the issue in the commit message is not getting resolved correctly. Can you fix that? Most likely it's just changing fix(issue#152) -> fix(#152)

[Anubhav-2003]

There are a bunch of test cases where we are passing datetime.now(...) as defaults when creating models for unit tests. Let's also refactor those to make them offset naive?

Also, another minor note - the autolink reference to the issue in the commit message is not getting resolved correctly. Can you fix that? Most likely it's just changing fix(issue#152) -> fix(#152)

Sure Ashwin, let me refactor those tests to make them naive as well. Also thank you, for fixing the PR title issue.

Regards,
Anubhav