## Summary
- Replace `subMonths()` with `subMonthsNoOverflow()` across controllers,
commands, and tests to prevent date overflow on months with 31 days
- On Jan 31, `subMonths(2)` overflows: Nov 31 doesn't exist → Carbon
rolls forward to Dec 1, producing wrong date ranges and off-by-one month
counts
## Root cause
Carbon's `subMonths()` allows day overflow. When the target month has
fewer days than the source date, it rolls into the next month. For
example:
- `2026-01-31 subMonths(2)` → Nov 31 → **2025-12-01** (expected Nov 30)
- `2026-01-31 subMonths(11)` → Feb 31 → **2025-03-03** (expected Feb 28)
`subMonthsNoOverflow()` clamps to the last valid day of the target month
instead.
## Files changed
- `app/Http/Controllers/Api/CashflowAnalyticsController.php` — cashflow
trend start date calculation
- `app/Console/Commands/ResetDemoAccountCommand.php` — balance history
date generation (was causing duplicate `balance_date` entries)
- `tests/Feature/AccountControllerTest.php` — balance evolution `from`
param
- `tests/Feature/CashflowAnalyticsTest.php` — transaction date
generation in loop
- `tests/Feature/DashboardAnalyticsTest.php` — net worth evolution
`from` param
## Test plan
- [x] `account balance evolution returns data` — expects 3 months, was
getting 2
- [x] `cashflow trend returns monthly data` — expects 3 months, was
getting 2
- [x] `cashflow trend defaults to 12 months` — expects 12 months, was
getting 11
- [x] `net worth evolution returns monthly data points` — expects 3
months, was getting 2
- [x] `demo:reset creates demo user` — was throwing
UniqueConstraintViolation on duplicate balance dates
Summary
- Add new Cashflow page with income/expense analytics, Sankey chart
visualization, and trend analysis
- Add Cashflow summary widget to the dashboard
- Implement feature flag system using Laravel Pennant to control feature
visibility per user
- Add artisan commands to enable/disable features: `php artisan
feature:enable/disable [feature] [email|all]`
## New Features
- **Cashflow Page**: Period-based income/expense breakdown with category
analysis
- **Sankey Chart**: Visual flow diagram showing money movement between
categories
- **Trend Chart**: 12-month historical cashflow visualization
- **Dashboard Widget**: Quick cashflow summary card
- **Feature Flags**: Cashflow feature hidden behind feature flag,
controllable per-user
## How to enable it
This feature it's under a feature flag until we are sure it's working
fine. If you want to test it, [send us a message on the general channel
in our discord](https://discord.gg/9UQWZECDDv). If you're self hosting
just run `php artisan feature:enable CashflowFeature {your_email}`.
## New Cashflow Page
<img width="1278" height="1185" alt="image"
src="https://github.com/user-attachments/assets/83469f24-9f96-4e5f-bef9-86c076d31243"
/>
<img width="1274" height="1035" alt="image"
src="https://github.com/user-attachments/assets/8949ff9d-c370-4fc4-81c6-268307c587a5"
/>
## New Dashboard Widget
<img width="1180" height="289" alt="image"
src="https://github.com/user-attachments/assets/ad984a66-9ffd-4079-85ce-0b2d28278d76"
/>
<img width="1179" height="286" alt="image"
src="https://github.com/user-attachments/assets/bff60286-8ea2-4e9c-8fa6-22755566648f"
/>
Víctor Falcón