test(db): align PostgreSQL smoke fixtures with current schema

[seonghobae]

What changed

• Remove the obsolete emails owner/date index from the production bootstrap
  path; the canonical model is email_records.
• Make PostgreSQL smoke fixtures provide the non-null email_records.is_read
  state explicitly, matching the current migration/model contract.
• Add a regression assertion and an Unreleased changelog entry.

This is a small prerequisite for the current PDF DOM upload follow-up (#1427):
it restores the full backend smoke gate without mixing unrelated product code
into that PR.

Verification

• ruff check backend/scripts/bootstrap_db.py backend/tests/test_bootstrap_db.py backend/tests/test_data_api.py
• git diff --check
• PYTHONWARNINGS=error python -m pytest backend/tests -q
  (1833 passed, 2 skipped)
• Focused bootstrap/data smoke tests (2 passed)

Risk and rollback

This changes only bootstrap index creation and test seed columns. The rollback
is a normal revert of this PR; no schema migration or irreversible operation is
introduced.

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📥 Commits

Reviewing files that changed from the base of the PR and between f3beb1c and 9012b10.

📒 Files selected for processing (4)

• CHANGELOG.md
• backend/scripts/bootstrap_db.py
• backend/tests/test_bootstrap_db.py
• backend/tests/test_data_api.py

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[github-actions]

PR governance metadata gate is not ready for 9012b10d3d3b5ac9bfab5d57780cbbfce4fbf2cc:

• Required check strix is FAILURE on the current head.

[seonghobae]

The current-head strix failure is infrastructure-only: the job log records NVIDIA NIM HTTP 429 on all primary retries, then the fallback emitted provider warning/error evidence and direct OpenAI returned HTTP 404. No authoritative clean Strix report was produced. This is not a source failure in the bootstrap/test fixture diff; the PR remains on the protected normal path pending hosted gates and independent approval.

[seonghobae]

Maintainer exact-head validation

• Repository: ContextualWisdomLab/naruon
• Pull request: test(db): align PostgreSQL smoke fixtures with current schema #1468
• Exact head SHA: 1da167de26b442be6961622f15bb36ae9374e6c4
• Exact base SHA: e5e99b4e3bb081b92c602358878856536030e2ca
• Local validation: the exact-head PostgreSQL smoke regression passed in the dedicated PR worktree; Ruff and git diff --check passed.
• Hosted evidence: the current exact-head check rollup has no failed or pending check runs.
• Current exact-head approvals: 0; the protected ruleset requires two qualifying approvals.
• Current unresolved review threads: 0.
• Decision: WAIT_AND_REMEDIATE for independent approvals; continue through the protected review/check path with no bypass or direct protected-branch write.