Add Slack activity digest scheduling with GoodJob and fix zero-total percentage handling in Wakatime summaries

[LittleCodr]

• Guard the Wakatime summary percentage calculation against zero totals to prevent division errors.
• Reuse a cached helper reference when building summary chunks to avoid repeated lookups.
• Update [wakatime_service_test.rb] to assert on the :err key and cover the zero-total case.

Testing

docker compose run web rails test test/lib/wakatime_service_test.rb

Overview

• add SlackActivityDigestSubscription model, service, and migration to store channel preferences
• wire up GoodJob scheduler + worker to build and post daily digest blocks to Slack
• expose management UI under my/activity_digest_subscription and surface link from Slack settings
• document required SLACK_ACTIVITY_DIGEST_BOT_TOKEN in the README and add coverage for scheduler, service, and job payloads

Testing

• docker compose run web rails test test/models/slack_activity_digest_subscription_test.rb
• docker compose run web rails test test/services/slack_activity_digest_service_test.rb
• docker compose run web rails test test/jobs/slack_activity_digest_job_test.rb

[3kh0]

Tests fail due to migrations

Error:
SlackActivityDigestSubscriptionTest#test_not_due_when_already_sent_today:
ActiveRecord::RecordNotUnique: PG::UniqueViolation: ERROR:  duplicate key value violates unique constraint "index_api_keys_on_token"
DETAIL:  Key (token)=(MyText) already exists.

[Copilot]

Pull Request Overview

This pull request adds a scheduled Slack activity digest feature that posts daily coding summaries to Slack channels using GoodJob scheduling, and includes a defensive fix to prevent division-by-zero errors in Wakatime summary percentage calculations.

• Introduces daily digest scheduling infrastructure with subscription management
• Guards Wakatime percentage calculations against zero totals and optimizes helper lookups
• Adds comprehensive test coverage for models, services, and jobs

Reviewed Changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
app/models/slack_activity_digest_subscription.rb	New model with timezone-aware delivery scheduling logic and validation
app/services/slack_activity_digest_service.rb	Service to build digest blocks with user/project activity summaries
app/jobs/slack_activity_digest_scheduler_job.rb	Hourly cron job to check and enqueue digest deliveries
app/jobs/slack_activity_digest_job.rb	Worker to build and post digest messages to Slack API
app/controllers/my/activity_digest_subscriptions_controller.rb	CRUD controller for user digest preference management
app/views/my/activity_digest_subscriptions/show.html.erb	UI for configuring digest timezone and delivery hour
app/views/users/edit.html.erb	Adds navigation link to digest preferences
config/routes.rb	Registers digest subscription resource routes
config/initializers/good_job.rb	Configures scheduler to run every hour at 15 minutes past
db/migrate/20251114120000_create_slack_activity_digest_subscriptions.rb	Creates subscriptions table with channel and delivery settings
lib/wakatime_service.rb	Fixes zero-division error in percentage calculation and caches helper reference
test/models/slack_activity_digest_subscription_test.rb	Tests delivery scheduling logic across timezones and dates
test/services/slack_activity_digest_service_test.rb	Tests digest block building with and without activity data
test/jobs/slack_activity_digest_job_test.rb	Tests Slack API integration and subscription update
test/lib/wakatime_service_test.rb	Updates assertion key from :error to :err and adds zero-total test
README.md	Documents required SLACK_ACTIVITY_DIGEST_BOT_TOKEN environment variable

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