adding data-services

REFACTORING.md

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+# Stock Bot Project Structure Refactoring
+
+This document outlines the changes made to improve separation of concerns in the stock-bot project architecture.
+
+## Directory Structure Changes
+
+1. Created a dedicated `libs/` directory (replacing the previous `packages/` approach)
+2. Split monolithic type definitions into domain-specific modules
+3. Created specialized libraries for cross-cutting concerns
+
+## New Libraries
+
+### 1. `@stock-bot/shared-types`
+Domain-specific type definitions organized by functional area:
+- `market/` - Market data structures (OHLCV, OrderBook, etc.)
+- `trading/` - Trading types (Orders, Positions, etc.)
+- `strategy/` - Strategy and signal types
+- `events/` - Event definitions for the event bus
+- `api/` - Common API request/response types
+- `config/` - Configuration type definitions
+
+### 2. `@stock-bot/event-bus`
+A Redis-based event bus implementation for inter-service communication:
+- Publish/subscribe pattern for asynchronous messaging
+- Support for typed events
+- Reliable message delivery
+
+### 3. `@stock-bot/utils`
+Common utility functions shared across services:
+- `dateUtils` - Date/time helpers for market data
+- `financialUtils` - Financial calculations (Sharpe ratio, drawdown)
+- `logger` - Standardized logging service
+
+### 4. `@stock-bot/api-client`
+Type-safe API clients for inter-service communication:
+- `BaseApiClient` - Common HTTP client functionality
+- Service-specific clients (BacktestClient, StrategyClient)
+
+## Benefits of the New Architecture
+
+1. **Better Separation of Concerns**
+   - Each library has a clear, focused purpose
+   - Domain types are logically grouped
+
+2. **Improved Maintainability**
+   - Smaller, focused modules
+   - Clear dependencies between modules
+
+3. **Type Safety**
+   - Consistent types across the entire system
+   - Better IDE autocompletion and error checking
+
+4. **Reduced Duplication**
+   - Shared utilities in a central location
+   - Consistent implementation of common patterns
+
+## Next Steps
+
+1. Update service implementations to use the new libraries
+2. Migrate from the old packages directory to the new libs structure
+3. Implement domain-specific validations in each type module
+4. Add unit tests for each library