Implement DB-backed contributor stats with queued updates and UI sidebar contributors

[lunny]

Related to #30132
Fix #22129
Fix #7796

• Replace git-log-based contributor stats with DB aggregation and daily storage.
• Add contributor stats queues, cron backfill, and notifier-driven updates.
• Provide commits-over-time endpoint and reuse stats for activity pulse data.
• Add repository sidebar contributor avatars and split template for reuse.
• Add tests covering contributors aggregation, activity stats, and commits-over-time.

A new option for Addtions + Deletions

Add time period for contributors

Add repository sidebar contributors

[lunny]

It seems it's a good time to implement #29183 in this PR.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR migrates contributor/activity statistics from git-log based, on-demand computation to DB-backed daily aggregates with queued updates, adds a commits-over-time endpoint, and surfaces contributors in the repository sidebar and contributors UI.

Changes:

• Introduces DB tables and aggregation/query APIs for contributor daily/weekly stats, plus queues + notifier + cron backfill for generating/updating stats.
• Updates web endpoints and UI charts to consume DB-backed “commits/code frequency/contributors” data (including new “additions + deletions” mode and time-range filter).
• Adds API endpoint + swagger schema for listing repository contributors with stats, and updates tests accordingly.

Reviewed changes

Copilot reviewed 42 out of 42 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
web_src/js/utils/time.ts	Normalizes computed week start timestamps to UTC midnight.
web_src/js/utils/color.ts	Adds chart color key for combined additions+deletions series.
web_src/js/components/RepoRecentCommits.vue	Switches to new “commits over time” semantics and data handling.
web_src/js/components/RepoContributors.vue	Adds time-range filter and combined additions+deletions contribution type.
web_src/js/components/RepoCodeFrequency.vue	Improves single-point chart rendering.
tests/integration/api_repo_contributors_test.go	Adds integration coverage for new contributors API stats fields.
tests/integration/api_admin_test.go	Updates cron task count expectations due to new cron task.
templates/swagger/v1_json.tmpl	Adds swagger path + schemas for contributors endpoint and fields.
templates/repo/pulse.tmpl	Updates pulse template to use new DB-backed commit counts/fields.
templates/repo/home_sidebar_contributors.tmpl	New sidebar partial rendering top contributor avatars.
templates/repo/home_sidebar_bottom.tmpl	Includes contributors sidebar partial on repo home.
services/repository/repository.go	Initializes contributor stats queues during repository service init.
services/repository/contributors_stats.go	Implements queues + update/rebuild processing and daily stat generation.
services/repository/contributors_over_time.go	Adds weekly totals query for “commits over time” and similar charts.
services/repository/contributors_over_time_test.go	Unit tests for weekly totals aggregation.
services/repository/contributors_notify.go	Hooks push/default-branch changes to enqueue stats updates/rebuilds.
services/repository/contributors_graph.go	Replaces cache/git-log contributor stats with DB-backed aggregation.
services/repository/contributors_graph_test.go	Updates contributor graph tests and adds parser + gitstats tests.
services/cron/tasks_extended.go	Adds daily cron to enqueue rebuilds for repos missing contributor stats.
routers/web/web.go	Routes recent-commits data to new handler.
routers/web/repo/view_home.go	Prepares repo-home sidebar contributor data.
routers/web/repo/recent_commits.go	Adds RecentCommitsData endpoint powered by weekly stats.
routers/web/repo/contributors.go	Adds from/to query params and switches to DB-backed contributor stats.
routers/web/repo/code_frequency.go	Switches code-frequency JSON to weekly DB stats.
routers/api/v1/api.go	Registers new API route for listing contributors.
routers/api/v1/repo/contributors.go	Implements contributors API endpoint returning stats + user info.
routers/api/v1/swagger/repo.go	Adds swagger response type for ContributorList.
options/locale/locale_en-US.json	Adds admin locale key for rebuild contributor stats cron.
modules/structs/repo_commit.go	Adds changed_files to commit stats struct.
modules/structs/contributor.go	Adds Contributor API struct + custom JSON marshaling.
models/git/repo_stats.go	Removes old git-based code activity stats implementation.
modules/git/repo_stats_test.go	Removes tests tied to old git-based code activity stats.
models/user/list.go	Moves/introduces GetUsersMapByIDs/GetPossibleUserFromMap into main list file.
models/user/user_list.go	Removes now-duplicated user list helpers file.
models/repo/contribution/main_test.go	Adds TestMain for contribution model tests.
models/repo/contribution/contributor_meta.go	Adds repo_contributor_meta model for tracking processing state.
models/repo/contribution/contributor_daily.go	Adds repo_contributor_daily model and query/update APIs.
models/repo/contribution/contributor_daily_test.go	Adds comprehensive tests for contributor stats aggregation APIs.
models/migrations/v1_27/v331.go	Adds migration creating contributor daily/meta tables.
models/migrations/migrations.go	Registers migration 331.
models/activities/repo_activity.go	Switches activity code stats/top authors to DB-backed contributor daily stats.
models/activities/repo_activity_test.go	Adds tests for DB-backed activity code stats.

Comments suppressed due to low confidence (2)

web_src/js/components/RepoRecentCommits.vue:1

• Removing the previous .slice(-52) means the chart may render an unbounded number of weeks (potentially years), which can noticeably degrade chart rendering performance and UX in large repos. Consider reintroducing a reasonable cap (or a default range) and/or adding server-side date range parameters so the endpoint returns a bounded window by default.
  web_src/js/components/RepoContributors.vue:1
• The dropdown labels should use proper pluralization (“Months”) for values > 1, and ideally be localized via ctx.Locale rather than hardcoded English strings. Updating these strings improves UX and keeps i18n consistent with the rest of the page.

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