feat: Add Advanced Data Integrity Patterns for Business Rules

- Cross-table data validation with comprehensive rule engine
- Hierarchical data consistency management for parent-child relationships
- Conditional field dependencies with dynamic requirements
- Data versioning and audit trail with field-level change tracking
- Comprehensive documentation with implementation guidelines

Each pattern includes:
- Production-ready business rule implementations
- Advanced validation and error handling
- Performance optimization considerations
- Security best practices and compliance features
- Extensive inline documentation and usage examples

Author: ashvin2005

Server-Side Components/Business Rules/Advanced Data Integrity Patterns/README.md

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+# Advanced Data Integrity Patterns for ServiceNow Business Rules
+
+This collection provides sophisticated business rule patterns for maintaining data integrity, implementing complex validation logic, and ensuring consistent data state across ServiceNow applications.
+
+## 📋 Table of Contents
+
+- [Cross-Table Data Validation](#cross-table-data-validation)
+- [Hierarchical Data Consistency](#hierarchical-data-consistency)
+- [Conditional Field Dependencies](#conditional-field-dependencies)
+- [Data Versioning and Audit](#data-versioning-and-audit)
+- [Real-Time Data Synchronization](#real-time-data-synchronization)
+
+## 🔍 Cross-Table Data Validation
+
+**Files:** `cross_table_validation.js`, `relational_integrity_checker.js`
+
+Advanced validation patterns that ensure data consistency across multiple tables:
+- Foreign key integrity validation
+- Cross-reference validation with custom error messages
+- Dependent table updates with rollback capability
+- Complex business rule validation across entities
+
+## 🏗️ Hierarchical Data Consistency  
+
+**Files:** `hierarchical_consistency.js`, `parent_child_sync.js`
+
+Maintain data consistency in hierarchical structures:
+- Parent-child relationship validation
+- Cascading updates with conflict resolution
+- Recursive validation for tree structures
+- Orphaned record prevention and cleanup
+
+## ⚡ Conditional Field Dependencies
+
+**Files:** `conditional_field_logic.js`, `dynamic_mandatory_fields.js`
+
+Implement complex field dependency logic:
+- Dynamic required field validation
+- Conditional field visibility and read-only states
+- Multi-level dependency chains
+- Context-aware validation rules
+
+## 📝 Data Versioning and Audit
+
+**Files:** `data_versioning.js`, `comprehensive_audit_trail.js`
+
+Track and manage data changes with sophisticated auditing:
+- Field-level change tracking with metadata
+- Data versioning with restore capability
+- Audit trail with business context
+- Compliance reporting and data lineage
+
+## 🔄 Real-Time Data Synchronization
+
+**Files:** `real_time_sync.js`, `distributed_data_consistency.js`
+
+Maintain data consistency across distributed systems:
+- Real-time synchronization patterns
+- Conflict resolution strategies
+- Eventual consistency implementation
+- Cross-instance data synchronization
+
+## 🎯 Key Features
+
+### Advanced Validation Engine
+- Multi-table validation with transaction safety
+- Complex business rule implementation
+- Error aggregation and user-friendly messages
+- Performance-optimized validation chains
+
+### Intelligent Automation
+- Context-aware field updates
+- Smart default value assignment
+- Automated relationship management
+- Conditional workflow triggers
+
+### Data Integrity Enforcement
+- Referential integrity validation
+- Business rule constraint enforcement
+- Data quality scoring and monitoring
+- Automated data cleansing routines
+
+## 📊 Pattern Categories
+
+### Validation Patterns
+- **Input Validation**: Comprehensive data sanitization and validation
+- **Business Logic Validation**: Complex multi-field business rules
+- **Cross-Reference Validation**: Inter-table relationship validation
+- **Temporal Validation**: Time-based validation and constraints
+
+### Synchronization Patterns
+- **Master-Detail Sync**: Parent-child data synchronization
+- **Cross-Table Sync**: Related table data consistency
+- **External System Sync**: Integration with external data sources
+- **Real-Time Updates**: Event-driven data synchronization
+
+### Audit Patterns
+- **Change Tracking**: Comprehensive audit trail implementation
+- **Version Control**: Data versioning with rollback capability
+- **Compliance Logging**: Regulatory compliance audit trails
+- **Performance Monitoring**: Data operation performance tracking
+
+## 🔧 Implementation Guidelines
+
+### Performance Considerations
+- Minimize database queries in business rules
+- Use efficient GlideRecord query patterns
+- Implement proper error handling and rollback
+- Consider asynchronous processing for heavy operations
+
+### Security Best Practices
+- Validate user permissions before data operations
+- Sanitize input data to prevent injection attacks
+- Implement proper access control for sensitive operations
+- Log security-relevant data changes
+
+### Maintainability
+- Use modular business rule design
+- Implement proper logging for troubleshooting
+- Document complex business logic thoroughly
+- Follow ServiceNow coding standards
+
+## 📚 Related Documentation
+
+- [ServiceNow Business Rules Documentation](https://developer.servicenow.com/dev.do#!/learn/learning-plans/tokyo/new_to_servicenow/app_store_learnv2_automatingapps_tokyo_business_rules)
+- [GlideRecord API Reference](https://developer.servicenow.com/dev.do#!/reference/api/tokyo/server/no-namespace/c_GlideRecordScopedAPI)
+- [Server-side Scripting Best Practices](https://developer.servicenow.com/dev.do#!/guides/tokyo/now-platform/tpb-guide/scripting_technical_best_practices)