diff --git a/.github/workflows/server-parity.yml b/.github/workflows/server-parity.yml
index 5440e0f6b..36bc297d0 100644
--- a/.github/workflows/server-parity.yml
+++ b/.github/workflows/server-parity.yml
@@ -2399,6 +2399,7 @@ jobs:
             --mode http --url http://parity-server:8080 --target php --output /evidence/php.json \
             --exclude-fixture tests/Fixtures/ServerParity/service-calls.json \
             --exclude-fixture tests/Fixtures/ServerParity/schedule-catalog.json \
+            --exclude-fixture tests/Fixtures/ServerParity/namespace-delete-payloads.json \
             --include-fixture tests/Fixtures/ServerParityPending/patch-insertion-activity-pending.json \
             --include-fixture tests/Fixtures/ServerParityPending/patch-insertion-activity-completed.json \
             --include-fixture tests/Fixtures/ServerParityPending/patch-created-activity-pending.json \
@@ -2413,6 +2414,7 @@ jobs:
             --mode embedded --application-root /app --target embedded --output /evidence/embedded.json \
             --exclude-fixture tests/Fixtures/ServerParity/service-calls.json \
             --exclude-fixture tests/Fixtures/ServerParity/schedule-catalog.json \
+            --exclude-fixture tests/Fixtures/ServerParity/namespace-delete-payloads.json \
             --include-fixture tests/Fixtures/ServerParityPending/patch-insertion-activity-pending.json \
             --include-fixture tests/Fixtures/ServerParityPending/patch-insertion-activity-completed.json \
             --include-fixture tests/Fixtures/ServerParityPending/patch-created-activity-pending.json \
@@ -2427,6 +2429,7 @@ jobs:
             --mode http --url http://parity-rust:8080 --target rust --output /evidence/rust.json \
             --exclude-fixture tests/Fixtures/ServerParity/service-calls.json \
             --exclude-fixture tests/Fixtures/ServerParity/schedule-catalog.json \
+            --exclude-fixture tests/Fixtures/ServerParity/namespace-delete-payloads.json \
             --include-fixture tests/Fixtures/ServerParityPending/patch-insertion-activity-pending.json \
             --include-fixture tests/Fixtures/ServerParityPending/patch-insertion-activity-completed.json \
             --include-fixture tests/Fixtures/ServerParityPending/patch-created-activity-pending.json \
@@ -2440,6 +2443,7 @@ jobs:
             scripts/conformance/server-parity.mjs compare /evidence/php.json /evidence/rust.json /evidence/embedded.json \
             --exclude-fixture tests/Fixtures/ServerParity/service-calls.json \
             --exclude-fixture tests/Fixtures/ServerParity/schedule-catalog.json \
+            --exclude-fixture tests/Fixtures/ServerParity/namespace-delete-payloads.json \
             --include-fixture tests/Fixtures/ServerParityPending/patch-insertion-activity-pending.json \
             --include-fixture tests/Fixtures/ServerParityPending/patch-insertion-activity-completed.json \
             --include-fixture tests/Fixtures/ServerParityPending/patch-created-activity-pending.json \
@@ -2457,12 +2461,17 @@ jobs:
           # reference's SQLite maintenance writer even after five retries.
           schedule_catalog_status=0
           bash scripts/conformance/server-parity/update-validation-sqlite.sh http://parity-server:8080 http://parity-rust:8080 schedule-catalog || schedule_catalog_status=$?
+          # Server #1018: post-commit payload deletion can remain pending
+          # under the frozen PHP reference's SQLite maintenance writer.
+          namespace_delete_payloads_status=0
+          bash scripts/conformance/server-parity/update-validation-sqlite.sh http://parity-server:8080 http://parity-rust:8080 namespace-delete-payloads || namespace_delete_payloads_status=$?
           # A native fixture difference fails the step only after the
           # comparison has run, so one difference cannot hide the rest.
           test "$native_record_status" -eq 0
           test "$compare_status" -eq 0
           test "$service_calls_status" -eq 0
           test "$schedule_catalog_status" -eq 0
+          test "$namespace_delete_payloads_status" -eq 0
       - name: Compare published patch, legacy-marker and range-repair profiles
         if: ${{ matrix.part == 'restarts' }}
         env:
diff --git a/scripts/conformance/server-parity/native-image-corpus.sh b/scripts/conformance/server-parity/native-image-corpus.sh
index 405c84acf..4a1a70b8e 100755
--- a/scripts/conformance/server-parity/native-image-corpus.sh
+++ b/scripts/conformance/server-parity/native-image-corpus.sh
@@ -30,10 +30,11 @@ DW_PARITY_RUNNER_REVISION=$(git rev-parse HEAD)
 image=$(jq -r '.server.images["linux/amd64"] | sub("^durableworkflow/server@"; "ghcr.io/durable-workflow/server@")' tests/Fixtures/ServerParityBaselines/php-2.11.8.json)
 
 # The frozen PHP reference loses SQLite writes under maintenance contention.
-# service-calls (#796) and schedule-catalog (#1021) record separately below
-# with PHP's loop stopped; native maintenance remains enabled.
+# service-calls (#796), schedule-catalog (#1021) and namespace-delete-payloads
+# (#1018) record separately with PHP's loop stopped; native maintenance remains enabled.
 selection=(--exclude-fixture tests/Fixtures/ServerParity/service-calls.json
-  --exclude-fixture tests/Fixtures/ServerParity/schedule-catalog.json)
+  --exclude-fixture tests/Fixtures/ServerParity/schedule-catalog.json
+  --exclude-fixture tests/Fixtures/ServerParity/namespace-delete-payloads.json)
 for pending in patch-insertion-activity-pending patch-insertion-activity-completed patch-created-activity-pending \
   patch-created-activity-completed workflow-waiting-history-type workflow-waiting-history-message workflow-task-transient-retry; do
   selection+=(--include-fixture "tests/Fixtures/ServerParityPending/$pending.json")
@@ -119,15 +120,19 @@ bash scripts/conformance/server-parity/update-validation-sqlite.sh http://parity
 schedule_catalog_status=0
 bash scripts/conformance/server-parity/update-validation-sqlite.sh http://parity-server:8080 http://parity-rust:8080 schedule-catalog \
   || schedule_catalog_status=$?
+namespace_delete_payloads_status=0
+bash scripts/conformance/server-parity/update-validation-sqlite.sh http://parity-server:8080 http://parity-rust:8080 namespace-delete-payloads \
+  || namespace_delete_payloads_status=$?
 
 native_id=$(docker image inspect --format '{{.Id}}' "$native")
 jq -n --arg native "$native" --arg id "$native_id" --arg php "$image" --arg revision "$DW_PARITY_RUNNER_REVISION" \
   --argjson reference "$status" --argjson nativeStatus "$native_status" --argjson compare "$compare_status" \
   --argjson serviceCalls "$service_calls_status" \
   --argjson scheduleCatalog "$schedule_catalog_status" \
+  --argjson namespaceDeletePayloads "$namespace_delete_payloads_status" \
   '{schema:"durable-workflow.native-image-corpus.v1", native_image:$native, native_image_id:$id, php_reference:$php,
     runner_revision:$revision, backend:"sqlite",
-    status:{reference_records:$reference, native_record:$nativeStatus, compare:$compare, service_calls:$serviceCalls, schedule_catalog:$scheduleCatalog}}' \
+    status:{reference_records:$reference, native_record:$nativeStatus, compare:$compare, service_calls:$serviceCalls, schedule_catalog:$scheduleCatalog, namespace_delete_payloads:$namespaceDeletePayloads}}' \
   > parity-evidence/native-image-corpus.json
 cat parity-evidence/native-image-corpus.json
 test "$status" -eq 0
@@ -135,3 +140,4 @@ test "$native_status" -eq 0
 test "$compare_status" -eq 0
 test "$service_calls_status" -eq 0
 test "$schedule_catalog_status" -eq 0
+test "$namespace_delete_payloads_status" -eq 0
diff --git a/scripts/conformance/server-parity/update-validation-sqlite.sh b/scripts/conformance/server-parity/update-validation-sqlite.sh
index 9a9e67873..b1e1ae7ae 100644
--- a/scripts/conformance/server-parity/update-validation-sqlite.sh
+++ b/scripts/conformance/server-parity/update-validation-sqlite.sh
@@ -6,6 +6,8 @@
 # optional third argument names another fixture recorded the same way:
 # service-calls (#796) or schedule-catalog, whose backfill can lose an
 # occurrence to PHP's concurrent SQLite maintenance writer (#1021).
+# namespace-delete-payloads can leave a post-commit deletion pending (#1018).
+# These fixtures keep their exact assertions in the same PHP-only window.
 #
 # The published PHP record runs with PHP's maintenance loop stopped. On SQLite
 # the API server and that loop share one database file. Under the loop's writer
diff --git a/tests/Unit/NativeImageCorpusTest.mjs b/tests/Unit/NativeImageCorpusTest.mjs
index 060703346..932ac30c3 100644
--- a/tests/Unit/NativeImageCorpusTest.mjs
+++ b/tests/Unit/NativeImageCorpusTest.mjs
@@ -68,10 +68,10 @@ esac`,
   }
 }
 
-test('native image qualification records every selected fixture once across the two partitions', () => {
+test('native image qualification records every selected fixture once across main and isolated records', () => {
   const result = run();
   assert.equal(result.status, 0, result.stderr);
-  assert.deepEqual(result.helpers, ['service-calls', 'schedule-catalog']);
+  assert.deepEqual(result.helpers, ['service-calls', 'schedule-catalog', 'namespace-delete-payloads']);
   const commands = result.calls.filter(args => args.includes('scripts/conformance/server-parity.mjs'));
   assert.equal(commands.length, 4, 'three main records and their comparison');
   let first;
@@ -87,16 +87,19 @@ test('native image qualification records every selected fixture once across the
     if (first) assert.deepEqual(all, first, 'all record and comparison selections agree');
     first = all;
   }
-  assert.deepEqual(result.receipt.status, {reference_records: 0, native_record: 0, compare: 0, service_calls: 0, schedule_catalog: 0});
+  assert.deepEqual(result.receipt.status, {reference_records: 0, native_record: 0, compare: 0,
+    service_calls: 0, schedule_catalog: 0, namespace_delete_payloads: 0});
   assert.equal(result.receipt.runner_revision, revision);
 });
 
 for (const [stage, field] of [
   ['php', 'reference_records'], ['embedded', 'reference_records'], ['rust', 'native_record'],
   ['compare', 'compare'], ['service-calls', 'service_calls'], ['schedule-catalog', 'schedule_catalog'],
+  ['namespace-delete-payloads', 'namespace_delete_payloads'],
 ]) test(`failure in ${stage} is retained in the receipt and fails image qualification`, () => {
   const result = run(stage);
   assert.notEqual(result.status, 0, result.stderr);
   assert.equal(result.receipt.status[field], 17);
-  assert.deepEqual(result.helpers, ['service-calls', 'schedule-catalog'], 'one failure does not hide the separate checks');
+  assert.deepEqual(result.helpers, ['service-calls', 'schedule-catalog', 'namespace-delete-payloads'],
+    'one failure does not hide the separate checks');
 });
diff --git a/tests/Unit/ServerParityFixtureSelectionTest.mjs b/tests/Unit/ServerParityFixtureSelectionTest.mjs
index 6468ae19b..95d363010 100644
--- a/tests/Unit/ServerParityFixtureSelectionTest.mjs
+++ b/tests/Unit/ServerParityFixtureSelectionTest.mjs
@@ -57,7 +57,7 @@ function mainCorpusCommands(job) {
   return job.split(/(?=docker run )/).filter(command => /server-parity\.mjs (record|compare)/.test(command));
 }
 
-test('the SQLite job keeps update-validation in its main corpus and isolates service-calls and schedule-catalog', () => {
+test('the SQLite job keeps update-validation in its main corpus and isolates the three contention-sensitive fixtures', () => {
   const sqlite = jobs()['execution-and-codec'];
   const commands = mainCorpusCommands(sqlite);
   assert.equal(commands.length, 4, 'php, embedded and rust records plus their comparison');
@@ -65,6 +65,7 @@ test('the SQLite job keeps update-validation in its main corpus and isolates ser
     assert.deepEqual(command.match(/--exclude-fixture \S+/g), [
       '--exclude-fixture tests/Fixtures/ServerParity/service-calls.json',
       '--exclude-fixture tests/Fixtures/ServerParity/schedule-catalog.json',
+      '--exclude-fixture tests/Fixtures/ServerParity/namespace-delete-payloads.json',
     ]);
   }
   assert.ok(corpus.includes('update-validation.json'));
@@ -73,6 +74,8 @@ test('the SQLite job keeps update-validation in its main corpus and isolates ser
   assert.match(sqlite, /test "\$service_calls_status" -eq 0/);
   assert.match(sqlite, /schedule_catalog_status=0\n\s+bash scripts\/conformance\/server-parity\/update-validation-sqlite\.sh http:\/\/parity-server:8080 http:\/\/parity-rust:8080 schedule-catalog \|\| schedule_catalog_status=\$\?/);
   assert.match(sqlite, /test "\$schedule_catalog_status" -eq 0/);
+  assert.match(sqlite, /namespace_delete_payloads_status=0\n\s+bash scripts\/conformance\/server-parity\/update-validation-sqlite\.sh http:\/\/parity-server:8080 http:\/\/parity-rust:8080 namespace-delete-payloads \|\| namespace_delete_payloads_status=\$\?/);
+  assert.match(sqlite, /test "\$namespace_delete_payloads_status" -eq 0/);
   assert.doesNotMatch(sqlite, /update-validation-sqlite\.sh http:\/\/parity-server:8080 http:\/\/parity-rust:8080 \|\|/);
 });
 
diff --git a/tests/Unit/ServerParityUpdateValidationRetryTest.mjs b/tests/Unit/ServerParityUpdateValidationRetryTest.mjs
index 1209e7558..3d211ef7a 100644
--- a/tests/Unit/ServerParityUpdateValidationRetryTest.mjs
+++ b/tests/Unit/ServerParityUpdateValidationRetryTest.mjs
@@ -158,7 +158,7 @@ test('a native or embedded failure is never retried, even after a PHP retry', ()
   }
 });
 
-for (const fixture of ['service-calls', 'schedule-catalog']) test(`${fixture} records and retries under its own evidence names`, () => {
+for (const fixture of ['service-calls', 'schedule-catalog', 'namespace-delete-payloads']) test(`${fixture} records and retries under its own evidence names`, () => {
   const result = run('php1=fail-locked', fixture);
   assert.equal(result.status, 0, result.stderr);
   assert.deepEqual(result.records, ['php parity-v1', 'php parity-v1-retry', 'embedded parity-v1-retry', 'rust parity-v1-retry']);