feat: Implement comprehensive Market Manager with database and logging

- Add complete Market Manager package with in-memory storage and CRUD operations
- Implement arbitrage detection with profit calculations and thresholds
- Add database adapter with PostgreSQL schema for persistence
- Create comprehensive logging system with specialized log files
- Add detailed documentation and implementation plans
- Include example application and comprehensive test suite
- Update Makefile with market manager build targets
- Add check-implementations command for verification

Makefile.old

@@ -0,0 +1,134 @@
+# Makefile for MEV Bot
+
+# Variables
+BINARY=mev-bot
+MAIN_FILE=cmd/mev-bot/main.go
+BINARY_PATH=bin/$(BINARY)
+
+# Default target
+.PHONY: all
+all: build
+
+# Build the application
+.PHONY: build
+build:
+	@echo "Building $(BINARY)..."
+	@mkdir -p bin
+	@go build -o $(BINARY_PATH) $(MAIN_FILE)
+	@echo "Build successful!"
+
+# Run the application
+.PHONY: run
+run: build
+	@echo "Running $(BINARY)..."
+	@$(BINARY_PATH)
+
+# Run tests
+.PHONY: test
+test:
+	@echo "Running tests..."
+	@go test -v ./...
+
+# Run tests for a specific package
+.PHONY: test-pkg
+test-pkg:
+	@echo "Running tests for package..."
+	@go test -v ./$(PKG)/...
+
+# Run tests with coverage
+.PHONY: test-coverage
+test-coverage:
+	@echo "Running tests with coverage..."
+	@go test -coverprofile=coverage.out ./...
+	@go tool cover -html=coverage.out -o coverage.html
+	@echo "Coverage report generated: coverage.html"
+
+# Run unit tests
+.PHONY: test-unit
+test-unit:
+	@echo "Running unit tests..."
+	@go test -v ./test/unit/...
+
+# Run integration tests
+.PHONY: test-integration
+test-integration:
+	@echo "Running integration tests..."
+	@go test -v ./test/integration/...
+
+# Run end-to-end tests
+.PHONY: test-e2e
+test-e2e:
+	@echo "Running end-to-end tests..."
+	@go test -v ./test/e2e/...
+
+# Clean build artifacts
+.PHONY: clean
+clean:
+	@echo "Cleaning..."
+	@rm -rf bin/
+	@rm -f coverage.out coverage.html
+	@echo "Clean complete!"
+
+# Install dependencies
+.PHONY: deps
+deps:
+	@echo "Installing dependencies..."
+	@go mod tidy
+	@echo "Dependencies installed!"
+
+# Format code
+.PHONY: fmt
+fmt:
+	@echo "Formatting code..."
+	@go fmt ./...
+
+# Vet code
+.PHONY: vet
+vet:
+	@echo "Vetting code..."
+	@go vet ./...
+
+# Lint code (requires golangci-lint)
+.PHONY: lint
+lint:
+	@echo "Linting code..."
+	@which golangci-lint > /dev/null || (echo "golangci-lint not found, installing..." && go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest)
+	@golangci-lint run
+
+# Update dependencies
+.PHONY: update
+update:
+	@echo "Updating dependencies..."
+	@go get -u ./...
+	@go mod tidy
+	@echo "Dependencies updated!"
+
+# Install test dependencies
+.PHONY: test-deps
+test-deps:
+	@echo "Installing test dependencies..."
+	@go get github.com/stretchr/testify/assert
+	@go mod tidy
+	@echo "Test dependencies installed!"
+
+# Help
+.PHONY: help
+help:
+	@echo "Available targets:"
+	@echo "  all             - Build the application (default)"
+	@echo "  build           - Build the application"
+	@echo "  run             - Build and run the application"
+	@echo "  test            - Run tests"
+	@echo "  test-pkg        - Run tests for a specific package (use PKG=package_name)"
+	@echo "  test-coverage   - Run tests with coverage report"
+	@echo "  test-unit       - Run unit tests"
+	@echo "  test-integration - Run integration tests"
+	@echo "  test-e2e        - Run end-to-end tests"
+	@echo "  clean           - Clean build artifacts"
+	@echo "  deps            - Install dependencies"
+	@echo "  test-deps       - Install test dependencies"
+	@echo "  fmt             - Format code"
+	@echo "  vet             - Vet code"
+	@echo "  lint            - Lint code (requires golangci-lint)"
+	@echo "  update          - Update dependencies"
+	@echo "  help            - Show this help"