Building a Postgres proxy to write back to APIs

Sequin, an integration service, explored the challenges and solutions of writing data back to APIs from a Postgres database, initially attempting asynchronous writes that presented issues such as indeterminate API validation and potential data drift. The company sought synchronous writes, ensuring immediate error handling and API validation but faced limitations with existing methods like synchronous replication and foreign data wrappers. Ultimately, they developed a Postgres proxy, allowing seamless synchronous writes with support for SQL operations and returning clauses, though it introduced challenges such as increased latency and inability to support Postgres transactions. Despite these hurdles, Sequin sees potential in refining this approach in the future, prioritizing HTTP for current API interactions.

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