The What-If form was a 14-field stack with always-visible hint
paragraphs — ~1500px scroll before "Run". The user is single-allocation
(100% stocks), so the glide-path knob was noise. Hardcoded
`static(1.0)` at the API layer; dropped `glide_path` from
`SimulateRequest` (extra field on persisted Scenario rows still
honoured for Cartesian sweeps).
Frontend reorganised into anchor numbers (NW / spend / horizon at
text-2xl), a Plan card (jurisdiction + leave-UK + strategy chips +
conditional Floor/Custom sub-card), a Returns card (3-chip segmented
control with inline manual %), and a folded Advanced section
(savings, MC paths, seed). Verbose hints moved into ⓘ popovers next
to each label. Two new primitives: SegmentedControl + InfoTip.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Until now life events were stored but ignored by the engine — pure
metadata. Now they actually move portfolios.
Engine:
- simulator.simulate() takes optional cashflow_adjustments: a (n_years,)
real-GBP array applied each year *after* savings + return but
*before* withdrawal. Positive = inflow, negative = outflow.
- New fire_planner/life_events.py with EventInput dataclass +
events_to_cashflow_array(events, horizon). Handles ranged deltas,
one-time amounts, disabled events, year clipping past horizon,
negative year_start (clipped to 0), and summing multiple events.
API:
- /simulate accepts optional life_events list. Server converts each
to EventInput, builds cashflow_adjustments, passes to simulate().
- Frontend Run-now on scenario detail now fetches the scenario's
life events and includes them in the request — projections finally
reflect "retire at 50, kid born at y3, inheritance at y22".
Tests: 11 events helper + 4 end-to-end engine + 1 API integration =
16 new tests. 188 total (was 172). mypy strict + ruff clean.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Three small UX wins:
- /scenarios/:id Run now — POSTs /simulate with the scenario's params
and renders the result in a "Live preview run" card below the
persisted projection. Removes the recompute-or-wait friction.
- /what-if Save as scenario — appears once a simulation has run.
Prompts for a name (with a sensible default), POSTs the form values
to /scenarios as a user scenario, redirects to its detail page.
- /scenarios/:id/edit — PATCH form for user scenarios. Pre-fills from
current scenario; on save invalidates the scenarios query and
navigates back to detail. Backend already rejects PATCH on
cartesian; the UI also hides the Edit button for them.
api.scenarios gained patch(). 7 tests pass, typecheck + build clean.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Two new nested CRUD sections on /scenarios/:id, each list + add form
in one card:
- Life events: name, kind (free-text with datalist suggestions —
retirement, kid_born, mortgage_payoff, sabbatical, inheritance...),
year_start, optional year_end (one-time vs ranged), £/year delta.
One-line summary per row; Delete button per item.
- Goals: name, kind (target_nw, never_run_out, inheritance,
spending_floor), comparator (>= < etc), target amount, target year,
success threshold (probability bar). Same list+add+delete layout.
Both wire through the existing FastAPI endpoints (POST/GET on
nested paths, DELETE on flat /life-events/{id} and /goals/{id})
already shipped in Phase 0c. Mutations invalidate per-scenario
queries so the list refreshes immediately.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
/scenarios/new — form posts to POST /scenarios with name, description,
jurisdiction, strategy, glide path, leave-UK year, spending, NW seed,
savings, horizon. Required-name validation; on success invalidates the
scenarios query and navigates to the new detail page.
/scenarios/:id — Delete button (user scenarios only; cartesian are
backend-protected). Browser confirm prompt + DELETE /scenarios/{id} +
invalidate + redirect to list.
api.scenarios gains create() and delete(). New ScenarioCreateBody type.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
/scenarios — table of all scenarios with filter chips (all/cartesian/
user). Cartesian scenarios get a neutral badge; user-defined get an
emerald accent. Empty-state nudges the user to run /recompute.
/scenarios/:id — params summary + the latest persisted MC projection.
Reuses FanChart so chart code is shared with /what-if. 404 on the
projection endpoint is treated as "no run yet" (don't retry); other
errors surface normally.
Nav grew a Scenarios tab. typecheck + 5 tests + build pass.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
