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@Service
public class QueryService {
    @Autowired
    private SimpleQueryExecutor queryExecutor;
    
    public QueryResponse processNaturalLanguageQuery(String userQuery) {
        // 1. Get SQL from LLM (from your previous implementation)
        String generatedSQL = llmService.generateSQL(userQuery);
        
        // 2. Validate SQL (important!)
        validateSQL(generatedSQL);
        
        // 3. Execute query
        List<Map<String, Object>> results = queryExecutor.executeQuery(generatedSQL);
        
        // 4. Format response
        return formatResponse(results);
    }
}