Source
Spanner migrations: Automating dual-write with Antigravity CLI for minimal disruption
Google's Finance Engineering team automated their migration to Cloud Spanner using Antigravity CLI in headless mode. This approach refactored dual-write logic across more than 30 Data Access Objects to prevent production downtime.
Why it matters
Automating database migrations reduces the risk of human error and downtime in critical financial systems. This allows engineers to modernize infrastructure faster while maintaining strict data accuracy.
The details
The team used an orchestration script called migration_ui.py to run Antigravity CLI in headless mode, allowing for batch execution. Prompt templates were developed to handle Spanner-specific edge cases such as timestamp serialization and nullability conversions. The pipeline generated the converter, refactored DAO, and unit tests, feeding any linter or test errors back into the AI for self-correction. This enabled engineers to queue batches of DAOs for overnight generation and validation.
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