apollo-migration-deep-dive

# Apollo Migration Deep Dive

## Overview
Comprehensive guide for migrating to Apollo.io from other CRMs and data sources, including data mapping, validation, and rollback strategies.

## Migration Planning

### Pre-Migration Assessment

```typescript
// scripts/migration-assessment.ts
interface MigrationAssessment {
  source: {
    system: string;
    recordCount: number;
    dataQuality: DataQualityReport;
    fieldMapping: FieldMappingAnalysis;
  };
  target: {
    apolloPlan: string;
    creditBudget: number;
    apiLimits: APILimits;
  };
  risk: {
    level: 'low' | 'medium' | 'high';
    factors: string[];
    mitigations: string[];
  };
  timeline: {
    estimatedDuration: string;
    phases: Phase[];
  };
}

async function assessMigration(sourceConfig: any): Promise<MigrationAssessment> {
  // Analyze source data
  const sourceAnalysis = await analyzeSourceData(sourceConfig);

  // Check Apollo capacity
  const apolloCapacity = await checkApolloCapacity();

  // Calculate risks
  const risks = calculateRisks(sourceAnalysis, apolloCapacity);

  // Estimate timeline
  const timeline = estimateTimeline(sourceAnalysis, apolloCapacity);

  return {
    source: sourceAnalysis,
    target: apolloCapacity,
    risk: risks,
    timeline,
  };
}

async function analyzeSourceData(config: any): Promise<SourceAnalysis> {
  const records = await fetchSourceRecords(config);

  return {
    system: config.system,
    recordCount: records.length,
    dataQuality: {
      emailValid: records.filter(r => isValidEmail(r.email)).length / records.length,
      emailPresent: records.filter(r => r.email).length / records.length,
      phonePresent: records.filter(r => r.phone).length / records.length,
      companyPresent: records.filter(r => r.company).length / records.length,
      duplicates: findDuplicates(records).length,
    },
    fieldMapping: analyzeFields(records),
  };
}
```

### Field Mapping

```typescript
// src/migration/field-mapper.ts
interface FieldMapping {
  so