X API v2 and External Database: Synchronization Strategy for Zero-Downtime Migration

Data Migration and Stream Integration

A small application currently managing user-specific tweet data in a local database needs to migrate to a new architecture while maintaining continuous uptime. The goal is to transition historical data and real-time updates to a new storage layer without interrupting the user experience.

The integration involves using the X API v2 REST endpoints for historical retrieval via cursor-based pagination and the Filtered Stream endpoint for real-time event ingestion. However, there is a technical uncertainty regarding the overlap between the final pagination token of the historical fetch and the initial events received by the real-time stream.

Given the rate limits associated with the Basic and Pro tiers, the migration must avoid redundant requests while ensuring no data gaps occur during the switchover.

• How can the application reconcile the gap between the last retrieved record via next_token and the first event delivered by the Filtered Stream?
• What is the recommended method for deduplicating records that may appear in both the REST retrieval and the real-time stream during the migration window?