Fix duplicate watcher weighting in repository rankings

src/services/analytics.getTopRepositories.test.js

@@ -0,0 +1,68 @@
+
+import { describe, it, expect, vi, afterEach } from 'vitest'
+import { getTopRepositories } from './analytics'
+
+describe('getTopRepositories', () => {
+  afterEach(() => {
+    vi.restoreAllMocks()
+  })
+
+  it('does not let watchers_count affect repository scores', () => {
+    vi.spyOn(Date, 'now').mockReturnValue(
+      new Date('2026-01-01T00:00:00Z').getTime()
+    )
+
+    const baseRepo = {
+      name: 'example-repo',
+      stargazers_count: 100,
+      forks_count: 10,
+      pushed_at: '2025-01-01T00:00:00Z',
+    }
+
+    const withFewWatchers = {
+      ...baseRepo,
+      watchers_count: 1,
+    }
+
+    const withManyWatchers = {
+      ...baseRepo,
+      watchers_count: 10000,
+    }
+
+    const first = getTopRepositories([withFewWatchers], 1)[0]
+    const second = getTopRepositories([withManyWatchers], 1)[0]
+
+    expect(first.score).toBe(second.score)
+    expect(first.score).toBe(120)
+  })
+
+  it('ranks repositories using stars, forks, and activity', () => {
+    vi.spyOn(Date, 'now').mockReturnValue(
+      new Date('2026-01-01T00:00:00Z').getTime()
+    )
+
+    const repos = [
+      {
+        name: 'less-popular',
+        stargazers_count: 10,
+        forks_count: 1,
+        watchers_count: 10000,
+        pushed_at: '2025-01-01T00:00:00Z',
+      },
+      {
+        name: 'more-popular',
+        stargazers_count: 100,
+        forks_count: 10,
+        watchers_count: 0,
+        pushed_at: '2025-01-01T00:00:00Z',
+      },
+    ]
+
+    const result = getTopRepositories(repos, 2)
+
+    expect(result[0].name).toBe('more-popular')
+    expect(result[0].score).toBe(120)
+    expect(result[1].name).toBe('less-popular')
+    expect(result[1].score).toBe(12)
+  })
+})

src/services/analytics.js

@@ -194,9 +194,7 @@ export function getTopRepositories(repos, limit = 10) {
       const score =
         (repo.stargazers_count ?? 0) +
         (repo.forks_count ?? 0) * 2 +
-        (repo.watchers_count ?? 0) * 1.5 +
         activityBonus;
-
       return {
         ...repo,
         score,