DriftInsightPanel (new @/types DriftBill — its own row shape, money in dollars)
and OverdueCommandCenter (TrackerRow[]). Note: TS flags `Date - Date`
arithmetic → use .getTime(); the overdue/net-delta totals need asDollars at the
fmt boundary. typecheck 0, build green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
client/api.js -> api.ts. Types the fetch infrastructure: generic _fetch<T>
and get/post/put/patch/del<T> helpers, an ApiError interface (status/code/
details/data), a QueryParams type for the query-string builder, and File-typed
upload helpers. Endpoint response shapes are typed incrementally — most methods
default to Promise<unknown>; the ones consumed by typed .ts files get real
shapes (quickPay -> PaymentRecord, togglePaid -> TogglePaidResult, settings ->
settings map).
Typing togglePaid's result surfaced a latent narrowing bug in usePaymentActions:
the un-pay Undo closure read result.paymentId (number|undefined) inside a
deferred async callback where TS re-widens the if-narrowed value — fixed by
capturing the id in a const before the closure.
The 16 files importing '@/api.js' with an explicit extension were normalized to
'@/api' so Vite/TS resolve the .ts.
Verified: typecheck 0, lint 0 errors (47 warns), build green, 48 client tests,
and 17/17 e2e probe (every page renders, all API paths respond) — the central
fetch-module rename is runtime-safe.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Detects when a bill's recent payments have diverged from its configured
expected amount for 2+ consecutive months and surfaces it in a new
collapsible amber panel on the Tracker page.
- Migration v0.71: adds `drift_snoozed_until` to bills and
`notify_amount_change` to users
- New `driftService.getDriftReport()`: computes per-bill payment median
over last 3 months, flags drift above a user-configurable threshold
(default 5%, minimum $1 delta)
- New `GET /api/bills/drift-report` and `POST /api/bills/:id/snooze-drift`
routes (registered before `/:id` to avoid routing conflict)
- `runDriftNotifications()` added to daily worker — sends amber digest
email per user listing all changed bills with old → new amounts
- `notify_amount_change` wired through profile and notifications routes
- `DriftInsightPanel`: collapsible amber panel with per-bill
strikethrough old → new amount, ±% badge, TrendingUp/TrendingDown
icons, "Update to $X.XX" (with undo toast) and "Dismiss" (30 days)
actions; teal palette for price decreases
- `drift_threshold_pct` setting added to SettingsPage Billing Behavior
- "Notify on price changes" toggle added to ProfilePage notifications
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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