Build a Custom Memory Connector That Can Recover from Failure

A reliable custom connector requires more than fetching and uploading data: it must preserve stable source identities, distinguish content revisions from delivery attempts, track recoverable progress, respect permissions, and handle deletions. The design should begin with a single source collection and a clear acceptance contract, separating source-specific retrieval logic from the ingestion adapter and retaining key metadata such as source, collection, record ID, revision, timestamps, access scope, and content or references. Sync cursors should advance only after durable acceptance, while rejected records remain visible with explanations rather than being silently treated as successful. Connectors should apply source ordering rules to late revisions, propagate removals through derived records and caches, define how lost access is handled, and periodically reconcile source inventories because event feeds may be incomplete. Testing should simulate failures and edge cases including duplicate events, delayed old revisions, deletions, permission changes, and crashes between ingestion and cursor updates, using Supermemory’s document operations and ingestion guidance to validate one source before broadening the implementation.

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