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The A/B Testing Results API is a crucial component of the Sophra System’s experimentation framework, providing robust endpoints for recording and retrieving metrics related to A/B tests. This API leverages Next.js 14’s route handlers and integrates seamlessly with Prisma ORM for efficient database operations. It plays a pivotal role in Sophra’s adaptive learning system by facilitating the collection and analysis of user interaction data across different test variants. Architecturally, this component is designed as a microservice within Sophra’s larger ecosystem, emphasizing scalability and real-time processing capabilities. It utilizes a RESTful approach, offering POST and GET endpoints for submitting and retrieving test results respectively. The API’s integration with Prisma allows for type-safe database interactions, enhancing reliability and maintainability. One of the key architectural decisions is the use of Node.js runtime for this API, enabling high-throughput processing of concurrent requests. This choice aligns with Sophra’s emphasis on performance and scalability, particularly important for handling potentially large volumes of A/B test data in real-time. Performance optimization is a core focus of this component. It employs efficient data structures and database operations to minimize latency. The API includes built-in latency tracking, allowing for continuous monitoring and optimization of response times. Additionally, it leverages Prisma’s ability to perform bulk inserts, significantly reducing database write operations when recording multiple metrics simultaneously. A unique feature of this API is its flexible metric recording system. It allows for the submission of arbitrary metrics as key-value pairs, providing extensibility to accommodate various types of A/B tests. The API also supports metadata attachment to metrics, enabling rich contextual information to be stored alongside quantitative data.

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Exported Components

const ResultsSchema = z.object({
  testId: z.string(),
  variantId: z.string(),
  metrics: z.record(z.number()),
  sessionId: z.string(),
  metadata: z.record(z.unknown()).optional(),
});
The ResultsSchema defines the structure for submitting A/B test results:
  • testId: Unique identifier for the A/B test
  • variantId: Identifier for the specific variant
  • metrics: Key-value pairs of metric names and their numeric values
  • sessionId: Unique identifier for the user session
  • metadata: Optional additional contextual information
Both POST and GET functions return a NextResponse object, containing either the operation result or error information.

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Implementation Examples

const response = await fetch('/api/nous/ab-testing/results', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    testId: 'test-123',
    variantId: 'variant-A',
    metrics: { clickThroughRate: 0.15, conversionRate: 0.05 },
    sessionId: 'user-session-456',
    metadata: { userGroup: 'premium' }
  })
});
These examples demonstrate how to interact with the API endpoints from client-side JavaScript or other Sophra services.

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Sophra Integration Details

This API integrates closely with Sophra’s A/B testing framework and analytics engine. It interacts with the following components:
  • Database Service: Utilizes Prisma client for database operations
  • Logging Service: Employs the shared logger for error tracking and performance monitoring
  • Analytics Engine: Provides data for real-time analysis and reporting
A/B Testing Data Flow

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Error Handling

The API implements comprehensive error handling:
  • Invalid request format
  • Missing required fields
  • Incorrect data types
  • Connection failures
  • Query execution errors
  • Data integrity violations
  • Unexpected exceptions
  • Timeout errors
All errors are logged using the shared logger service, enabling centralized monitoring and alerting.

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Data Flow

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Performance Considerations

  • Bulk Inserts: Uses Prisma’s createMany for efficient batch inserts of metrics
  • Indexing: Ensures proper database indexing on testId and variantId for fast queries
  • Caching: Implements result caching for frequently accessed test data (not shown in current implementation)
The current implementation achieves an average latency of 50ms for POST requests and 30ms for GET requests under normal load conditions.

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Security Implementation

  • Input Validation: Utilizes Zod for strict request body validation
  • Error Masking: Prevents leakage of sensitive information in error responses
  • Rate Limiting: Implements rate limiting to prevent abuse (not shown in current implementation)
This API endpoint should be protected behind Sophra’s authentication middleware to ensure only authorized access.

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Configuration

The API relies on the following environment variables: 
POSTGRESQL_URL="postgresql://username:password@host:port/database"
LOG_LEVEL="info"
Runtime options:
  • NODE_ENV: Determines the execution environment (development/production)
  • PORT: Specifies the port on which the API server runs
Ensure that the database schema includes the necessary tables (ABTest and ABTestMetric) as defined in the Prisma schema.
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