## 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.
Co-Authored-By: tinkle-community <tinklefund@gmail.com>
Major database migration to modernize the AI trading system:
• **Database Migration**:
- Add PostgreSQL 15 and Redis 7 services to docker-compose
- Create comprehensive PostgreSQL schema with proper indexes and triggers
- Implement DatabaseInterface for multi-database support
- Add automatic environment-based database selection
• **Infrastructure**:
- PostgreSQL: ACID transactions, better concurrency, JSON support
- Redis: High-performance caching layer (prepared for future use)
- Docker services with health checks and dependency management
- Persistent volumes for data safety
• **Code Refactoring**:
- Abstract database operations through DatabaseInterface
- Implement PostgreSQL-specific operations with proper syntax
- Update all SQL queries to support both SQLite and PostgreSQL
- Fix foreign key constraints and data type conversions
• **Migration Tools**:
- Automated data migration script from SQLite to PostgreSQL
- Complete backup and restore procedures
- One-click migration script with validation
• **Compatibility**:
- Backward compatible with existing SQLite deployments
- Environment variable driven database selection
- Preserved all existing functionality and data
🎯 Benefits: Better performance, scalability, and reliability for production deployments
