ZhouYongyou dd035900b4 fix(api): add balance sync endpoint with smart detection ...

## Summary
- Add POST /traders/:id/sync-balance endpoint (Option B)
- Add smart detection showing balance change percentage (Option C)
- Fix balance display bug caused by commit 2b9c4d2

## Changes

### api/server.go
- Add handleSyncBalance() handler
- Query actual exchange balance via trader.GetBalance()
- Calculate change percentage for smart detection
- Update initial_balance in database
- Reload trader into memory after update

### config/database.go
- Add UpdateTraderInitialBalance() method
- Update traders.initial_balance field

## Root Cause
Commit 2b9c4d2 auto-queries exchange balance at trader creation time,
but never updates after user deposits more funds, causing:
- Wrong initial_balance (400 USDT vs actual 3000 USDT)
- Wrong P&L calculations (-2598.55 USDT instead of actual)

## Solution
Provides manual sync API + smart detection to update initial_balance
when user deposits funds after trader creation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

2025-11-04 19:55:16 +08:00

..

server.go

fix(api): add balance sync endpoint with smart detection

2025-11-04 19:55:16 +08:00