February 2026 monthly summary for microsoft/documentdb: What was delivered: - Implemented Historical Change Streams, enabling retrieval of historical data from local and archived WAL logs. Delivered new data structures, background indexing tasks, and updated token parsing to support V3 resume tokens. The feature is backed by libCURL-based downloads and WAL reuse and is gated behind a new config flag for safe rollout. Impact and business value: - Addresses a critical customer blocker by enabling access to historical change data, supporting auditing, compliance, and complex debugging use cases. - Extends data availability across timelines by resuming from archived WAL segments, reducing data gaps and improving recoverability. Tech and quality achievements: - Introduced WAL archival integration, background workers, and resume-token parsing enhancements. - Added feature flag (pgmongo.enable_historical_change_streams) with tests both with and without the flag. - Comprehensive validation through SQL regressions, .NET integration tests, and Python tests; long-haul stress tests documented. - PR merged: c76f6c3220842b91454b3defd343372f121c23fa (Merged PR 1892659: Historical Change Streams Implementation with libCURL based downloads and WAL reuse). Team and collaboration: - Cross-language testing and validation across SQL, .NET, Python pipelines; design documentation and testing pipelines updated to support historical streams.