dimas-b commented on code in PR #14196:
URL: https://github.com/apache/iceberg/pull/14196#discussion_r2389527374


##########
open-api/rest-catalog-open-api.yaml:
##########
@@ -1903,6 +1926,39 @@ components:
       schema:
         type: string
 
+    idempotency-key:
+      name: Idempotency-Key
+      in: header
+      required: false
+      schema:
+        type: string
+        format: uuid
+        minLength: 36
+        maxLength: 36
+        example: "550e8400-e29b-41d4-a716-446655440000"
+      description: |
+        Optional client-provided idempotency key for safe request retries.
+
+        When present, the server ensures no additional effects for requests 
that carry the same
+        Idempotency-Key within the same operation/resource scope. If a prior 
request with this key
+        has been finalized, the server returns the previously finalized 
response instead of
+        re-executing the mutation.
+
+        Finalization rules:
+        - Finalize & replay: 200, 201, 204, and deterministic terminal 4xx
+        - Do not finalize (not stored/replayed): 5xx, 409 request_in_progress
+
+        Key Requirements:
+        - Must be unique per client mutation operation (e.g., updateTable, 
createTable)

Review Comment:
   Do we have to relax uniqueness requirements to be "within" operation? If so, 
UUID-based keys may not be so useful because the server will have to use a 
compound key: (operation, UUID)... Why not require the key to be unique within 
the catalog?



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