# MR: Reports frontend — spec-driven generate form, sliceable viewer, dimension bars
**Branch:** `cached-reporting` → **Target:** `main`
## Summary
Reports UI rebuilt to treat the backend OpenAPI spec as the source of truth: the
generate-report form renders generically from `ReportQuery`, and the viewer displays
API-computed metrics verbatim instead of recomputing them client-side.
## Changes
### react-openapi (library)
- `MultiEnumField` renderer for array-of-enum fields; dispatch branch in
`FormFieldRenderer`
- `useFkFieldOptions` hook + `FKFieldConfig.value` (FK options keyed by a non-PK
field — accounts resolve by `name`)
- `FieldConfig.defaultValue` seeding in `extractFields`; enum lift for
`items.enum` arrays; sanitize-payload bypasses FK resolution when `fk.value` is set
### Reports page
- **GenerateReportPanel**: rewritten (~275 → ~110 lines) — fields extracted from the
served `ReportQuery` schema (labels, order, defaults, multi-enum, account picker);
server-side validation only
- **ReportViewer**:
- Period groups built from cube buckets keyed by canonical `period_id`; buckets
merged per period (disjoint slices), txn ids deduped
- Cards/bars/metric strips read `metrics` verbatim (outflows/inflows/sum/count/
avg/min/max/cadence/frequency); Net = one subtraction at render
- Dimension-switchable bar strip (Period / Payees / Tags): segmented pill control
with sliding indicator; pills disabled when the report has ≤1 distinct value;
top-10 bars in a fixed view paged by chevrons (hidden scrollbar)
- Active dim requests the full distribution via `payee=*` / `tags=*` when its own
filter is unselected; explicit selections always slice normally
- **TransactionList**: shared component with optional `groups` prop (API periods +
metrics) used by the viewer; Expense page keeps the client-side fallback path;
group strip shows Sum · Avg · Min · Max · Cadence (or Frequency /day when
cadence < 1)
### Fixes
- Strict DD-MM-YYYY parsing (`parseOccurredAt`) in period merges and date ordering —
`new Date()` mis-read dates as MM-DD-YYYY and corrupted merged cadence
(Aug Zomato: 12.89 days displayed vs 0.76 actual)
- Bar widths magnitude-based so all-outflow slices render at proper width
Reviewed-on: #16
Co-authored-by: Vishesh 'ironeagle' Bangotra <aetoskia@gmail.com>
Co-committed-by: Vishesh 'ironeagle' Bangotra <aetoskia@gmail.com>
