12.55Common bad patterns

Bad #1

Query Salesforce
if not found:
    Create

under concurrency.

Race condition.

Bad #2

Retry all timeouts with Create

Duplicates.

Bad #3

Use email as universal idempotency key

Unstable/non-unique business identity.

Bad #4

Deduplicate messages but ignore ordering

Stale state can still win.

Bad #5

Upsert Salesforce, therefore entire workflow is idempotent

Other side effects may duplicate.