Export resolveDbPath and make DailyRefinementJob DB path injectable with tests

[Copilot]

Description

The DailyRefinementJob DB path was derived from a non-exported module-level constant, making it impossible to assert the default value in tests. This refactors the path derivation into an exported, injectable function and adds focused tests to enforce the data/issues.db default.

scheduler/dailyRefinementJob.ts

• Replace module-level const dbPath with exported resolveDbPath(env?) — accepts an env object so tests can pass controlled environments without touching process.env
• DailyRefinementJob constructor now accepts optional dbPath param (default: resolveDbPath())

tests/dailyRefinement.test.ts

• Add describe("resolveDbPath") with two tests: default path ends with data/issues.db when env is empty; custom path is returned when DB_PATH is set

// Before
const dbPath = process.env.DB_PATH || path.join(__dirname, "../data/issues.db");

// After
export function resolveDbPath(env: NodeJS.ProcessEnv = process.env): string {
  return env.DB_PATH || path.join(__dirname, "../data/issues.db");
}

export class DailyRefinementJob {
  constructor(dbPath: string = resolveDbPath()) { ... }
}

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation update
• 🎨 Code style update (formatting, renaming)
• ♻️ Refactoring (no functional changes)
• ⚡ Performance improvement
• ✅ Test update

Related Issue

Testing Done

• Tested locally
• Added/updated tests
• All tests passing

Screenshots (if applicable)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Co-Authors

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Summary by cubic

Fixes how DailyRefinementJob finds the database by centralizing path resolution and allowing injection. Prevents failures when the working directory differs (local, CI, or cron).

• Bug Fixes
  • Centralize DB path logic via exported resolveDbPath; constructor now accepts an optional dbPath.
  • Respect DB_PATH env override with a ../data/issues.db fallback for consistency across environments.
  • Add unit tests covering default path and DB_PATH override.

^{Written for commit cd1aec7. Summary will update on new commits.}