SyncErrorCode:
| "VALIDATION_ERROR"
| "FK_CONSTRAINT_VIOLATION"
| "DUPLICATE_KEY"
| "NETWORK_TIMEOUT"
| "RATE_LIMIT_EXCEEDED"
| "CONNECTOR_ERROR"
| "TRANSFORM_ERROR"
| "MATCH_RESOLUTION_ERROR"
| "DATABASE_ERROR"
| "WRITE_VERIFICATION_ERROR"
| "WATERMARK_INVALID"
| "CONFIGURATION_ERROR"
| "UNKNOWN_ERROR"
Classification of sync errors for retry/alert decisions