Replace watchlist match reasons with MatchReason enum

[henry0816191]

Summary

Replace bare "author" / "paper" match-reason strings with a typed MatchReason(str, Enum) in the watchlist match pipeline. Producers, PerUserMatches, and tests now use enum members; Slack tags use reason.value for display.

Changes

• models.py: Add MatchReason (AUTHOR, PAPER); type PerUserMatches tuples as MatchReason.
• storage.py: matches_for_users() emits MatchReason.AUTHOR / MatchReason.PAPER.
• scout.py: notify_users() formats tags with reason.value (Python 3.14-safe).
• Tests: test_monitor.py, test_scout.py, test_storage.py — imports and tuple literals updated.

Out of scope: DB watchlist entry_type strings and Slack watchlist UI labels.

Acceptance criteria

Criterion	Status
MatchReason enum in models.py	Done
PerUserMatches uses MatchReason	Done
Producers emit enum members	Done
Consumers use .value for display	Done
Tests updated; no regressions	Done (360 passed)
mypy — no new errors	Done (3 pre-existing elsewhere)

Test plan

• ./run cov — 360 passed, 94% coverage
• ./run check in CI
• PR approved by at least 1 reviewer

Related

• Close Replace bare string match reasons with MatchReason enum #57

Summary by CodeRabbit

• Refactor

  • Internal match classification standardized to a structured enum, improving consistency of match-reason labels shown in watchlist notifications.

• Tests

  • Test suite updated to validate the new match classification across monitoring and notification flows.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0d790323-ec3c-4c6b-a303-2b08f5fd2ef8

📥 Commits

Reviewing files that changed from the base of the PR and between 5a6f574 and 44b8ebb.

📒 Files selected for processing (6)

• src/paperscout/models.py
• src/paperscout/scout.py
• src/paperscout/storage.py
• tests/test_monitor.py
• tests/test_scout.py
• tests/test_storage.py

---

📝 Walkthrough

Walkthrough

Replaces string match reasons with a new MatchReason enum, updates PerUserMatches typing, makes storage emit enum members, updates scout DM formatting to use reason.value, and adjusts tests to use the enum.

Changes

Match Reason Type Safety

Layer / File(s)	Summary
MatchReason enum and PerUserMatches schema src/paperscout/models.py	New MatchReason enum with AUTHOR and PAPER; PerUserMatches now stores `(Paper
Storage producer match reason emission src/paperscout/storage.py	Import added for MatchReason; UserWatchlist.matches_for_users() emits MatchReason.AUTHOR/MatchReason.PAPER instead of string literals.
Scout notification formatting src/paperscout/scout.py	notify_users() uses reason.value when composing paper-match and probe-hit bullets for Slack DMs.
Test fixtures and assertions tests/test_monitor.py, tests/test_scout.py, tests/test_storage.py	Tests updated to import MatchReason and construct/assert PerUserMatches using enum members rather than raw string literals.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• cppalliance/paperscout#25: Earlier refactor that introduced/moved PerUserMatches, related to this PR's tuple-shape/type changes.

Suggested reviewers

• wpak-ai

Poem

🐰 I swapped the bare strings for enum light,
Now reasons are typed and notifications right.
No stray typos hopping in the night,
MatchReason keeps the match tag bright.
Hoppy PR—typed and tight!

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 13.33% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main change: introducing a MatchReason enum to replace string-based match reasons.
Description check	✅ Passed	The description includes summary, detailed changes across all modified files, acceptance criteria, and test plan as required by the template.
Linked Issues check	✅ Passed	All objectives from issue #57 are met: MatchReason enum added [models.py], PerUserMatches types updated [models.py], producers emit enum members [storage.py], consumers use .value [scout.py], tests updated [test files], type checking clean [reported].
Out of Scope Changes check	✅ Passed	All changes are directly related to replacing string match reasons with the MatchReason enum. No out-of-scope modifications detected in the changeset.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/match-reason-enum

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[henry0816191]

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[henry0816191]

@coderabbitai full review

[coderabbitai]

✅ Action performed

Full review finished.