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xarmian
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* feat(admin): add /api/v1/admin/billing-stats proxy + cloud client (TASK-827)
New admin endpoint that powers the upcoming Pad Cloud Billing dashboard:
GET /api/v1/admin/billing-stats merges Stripe-derived metrics from pad-cloud
(active subs, MRR, ARR, churn, 30-day cancellations) with locally-computed
aggregates from the users table (customers_by_plan, new_signups_30d in the
last 30 days for plan='pro').
Architecture (PLAN-825 Option B):
- pad-cloud (TASK-826, already merged) hosts the Stripe API access in one
place; this PR adds the reverse pad → pad-cloud client method.
- Existing internal/billing.CloudClient gains GetBillingMetrics(): GET on
/admin/metrics/billing with the X-Cloud-Secret header (the same secret
pad-cloud already validates inbound calls with).
- New CloudSidecar.GetBillingMetrics() interface method keeps the server
package free of HTTP/Stripe dependencies and lets tests inject fakes.
- Existing fakeSidecar in handlers_account_test.go grows a no-op stub so
the account-delete tests still satisfy the extended interface.
Degradation contract:
- The endpoint always returns 200. Two booleans tell the UI which fallback
to render: cloud_unreachable=true (sidecar errored or unwired) and
stripe_configured=false (sidecar reachable but no STRIPE_SECRET_KEY yet).
- requireCloudMode + requireAdmin gate the route. Self-host gets 404,
non-admin gets 403.
Web glue:
- Added AdminBillingStats type to web/src/lib/types/index.ts.
- Added api.admin.getBillingStats() to web/src/lib/api/client.ts.
The Billing tab and metric cards land in TASK-828.
Tests:
- Billing package: GetBillingMetrics happy path (verifies method, path,
X-Cloud-Secret header, Accept header), Stripe-not-configured pass-through,
non-200 → SidecarError, transport error stays bare, malformed JSON,
nil/unconfigured client guards.
- Server package: self-host 404, non-admin 403, admin happy path
(merges local + remote correctly, handles plan="" → "free", filters
new_signups_30d to plan='pro' AND created_at >30d ago), no-sidecar
degrades to local-only, transport error degrades, sidecar 5xx degrades,
stripe_configured=false propagates verbatim with cloud_unreachable=false.
Part of PLAN-825 (Pad Cloud Admin Billing Dashboard).
* fix(admin): address Codex review (round 1) on billing-stats proxy
- Replace handler-side ListUsers walk with store.CountBillingAggregates
(two scalar SQL queries: COUNT(*) GROUP BY plan + a single COUNT(*)
for new pro signups). Removes the per-row TOTP decrypt overhead that
ListUsers performs and bounds CPU/bandwidth as the user table grows.
- Fix misleading TS comment on AdminBillingStats: clarify that "fully
healthy" requires cloud_unreachable=false AND stripe_configured=true,
not "both flags false" as previously stated.
Adds TestCountBillingAggregates exercising empty store, mixed plans,
empty-plan → "free" bucketing, and the 30-day cutoff filter for new
pro signups.
* fix(store): GROUP BY normalised plan expression in CountBillingAggregates
Codex round 2 caught a real bug: SELECT projected the COALESCE'd plan but
GROUP BY operated on the raw `plan` column, so users with plan='' and
plan='free' produced two distinct result rows that both scanned as "free"
in Go — the second iteration overwrote the first in CustomersByPlan,
silently underreporting the free-tier count.
Fix: GROUP BY COALESCE(NULLIF(plan, ''), 'free') so the grouping matches
the projection. Test updated: insertWithPlanAndDate now seeds an explicit
'' plan alongside two explicit 'free' rows and asserts the aggregate
rolls them up to 3 — the previous test only used CreateUser which always
inserts the column default ('free') and never exercised the empty-string
path.