## Why
Investment and retirement accounts show balance over time, but there's
no way to see how much money was actually put in versus how much is
current value. Users can't tell at a glance whether their investments
are up or down.
## What
Adds an "invested amount" tracking system across the full stack:
**Backend**
- New `invested_amount` column on `account_balances` (nullable
bigInteger, cents, per-date)
- Auto-sync from providers: Indexa Capital (instruments_cost +
cash_amount), Bitpanda (fiat deposit/withdrawal history), Binance
(90-day windowed deposit/withdrawal with crypto→fiat conversion)
- Manual input support via Update Balance dialog
- Historical invested amount data in all balance evolution APIs (net
worth, account detail)
**Frontend**
- Dashed line on sparkline charts (dashboard + accounts page) showing
per-point historical invested amount alongside balance
- Dashed line on account detail charts (daily AreaChart + monthly
ComposedChart)
- Tooltips with labeled rows: Balance, Invested, Gain/loss (color-coded)
- Invested amount column in balances history modal
- Invested amount field in balance import wizard (CSV mapping)
- Demo account seeder updated with invested amount data
## Screenshots
<img width="1301" height="750" alt="image"
src="https://github.com/user-attachments/assets/0f05ecd0-8b98-47b4-9fa4-027f0311e3bb"
/>
<img width="744" height="374" alt="image"
src="https://github.com/user-attachments/assets/c4daa816-dee0-4f94-957f-317a13bc80d5"
/>
<img width="1267" height="738" alt="image"
src="https://github.com/user-attachments/assets/21df350c-6954-4ff5-8b3c-b858df3a8b3a"
/>
<img width="1301" height="828" alt="image"
src="https://github.com/user-attachments/assets/16f5f021-a926-4e8e-a999-c4ca32d1ea3d"
/>
<img width="1274" height="845" alt="image"
src="https://github.com/user-attachments/assets/62f2dfc0-04f0-4bdb-b072-cf7cd1be77d3"
/>
## Summary
- Add Bitpanda as a new exchange provider using a single API key
(`X-Api-Key` header) to sync crypto and fiat wallet balances
- Follow the same architecture as Binance: provider string on
`banking_connections`, dedicated API client, balance sync service,
controller, form request, job wiring, factory state, route, and frontend
dialog
- Convert crypto wallet balances to the user's target currency via
`CurrencyConversionService`; fiat wallets are added directly or
converted if in a different currency
- Bitpanda appears in all countries in the connect dialog (same as
Binance)
- 18 new tests covering controller validation, balance sync scenarios,
sync job delegation, expiry handling, and email suppression
Víctor Falcón