## Summary
This PR adds a comprehensive billing usage analytics feature that
provides detailed breakdowns of credit consumption across execution
types, users, resources, and time periods. The implementation includes a
new ClickHouse-backed analytics service, GraphQL API endpoint, and a
frontend dashboard component.
## Key Changes
### Backend
- **New BillingAnalyticsService**: Queries ClickHouse for usage
breakdowns by user, resource, execution type, and time series data
- **BillingEventWriterService**: Writes billing events to ClickHouse for
analytics while maintaining best-effort semantics (never blocks Stripe
billing)
- **ClickHouse Schema**: Added `billingEvent` table with 3-year TTL for
storing detailed billing event data
- **GraphQL Resolver**: New `getBillingAnalytics` query that aggregates
usage data for the current billing period, protected by feature flag and
billing permissions
- **Enhanced BillingUsageEvent**: Added `userWorkspaceId` field to track
per-user credit consumption
- **AI Billing Integration**: Updated AI billing service to pass
`userWorkspaceId` when recording usage events
### Frontend
- **SettingsBillingAnalyticsSection**: New component displaying:
- Usage breakdown by execution type with progress bars
- Daily usage time series chart (28-day view)
- Per-user credit consumption breakdown
- Per-resource (agent/workflow) credit consumption breakdown
- **SettingsUsage Page**: Dedicated page for viewing usage analytics
- **GraphQL Query**: `GetBillingAnalytics` query with generated hooks
- **Navigation**: Added Usage menu item in settings (feature-flagged)
- **Mock Data**: Included screenshot mock data for preview/testing
### Feature Flag
- Added `IS_USAGE_ANALYTICS_ENABLED` feature flag to control visibility
and access to analytics features
## Implementation Details
- Analytics data is queried in parallel for performance
- ClickHouse writes are non-blocking to ensure billing operations never
fail
- Progress bars use dynamic coloring from a predefined palette
- Time series visualization normalizes bar heights relative to max value
- Empty state handling when no analytics data is available
- Responsive UI with proper text truncation for long names
https://claude.ai/code/session_01Y1EqrX6PFq3EJxJq89h7DF
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Co-authored-by: Claude <noreply@anthropic.com>
