diff --git a/docs/evidence/symbol-id-series-storage-20260906.json b/docs/evidence/symbol-id-series-storage-20260906.json
new file mode 100644
index 0000000..ab74b99
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+++ b/docs/evidence/symbol-id-series-storage-20260906.json
@@ -0,0 +1,118 @@
+{
+  "schemaVersion": "fidc-symbol-id-series-storage/v1",
+  "measuredAt": "2026-09-06T06:25:00+08:00",
+  "host": "192.168.31.177",
+  "engineCommit": "5a7c49a",
+  "serviceCommit": "61a478839674ab03356083fb777840342ad4c726",
+  "implementation": {
+    "description": "build market and adjusted-close series directly in immutable symbol-id vectors and route string helpers through the canonical symbol-id index",
+    "removedStructures": [
+      "market_series_by_symbol AHashMap",
+      "adjusted_close_series_by_symbol AHashMap",
+      "second Arc copy from string maps into symbol-id vectors"
+    ],
+    "publicDataHelpersChanged": false,
+    "rollingSemanticsChanged": false,
+    "adjustmentSemanticsChanged": false,
+    "pitSemanticsChanged": false,
+    "selectionResultsCached": false,
+    "netSourceLines": -10
+  },
+  "adjacentBaseline": {
+    "engineCommit": "cda249e9b4458770361b4cad570bd1e52f9eb67a",
+    "runs": [
+      {
+        "runId": "btr_1788645721278_2764691_0",
+        "totalSeconds": 18.207,
+        "dataSeconds": 14.052,
+        "datasetConstructSeconds": 4.448
+      },
+      {
+        "runId": "btr_1788646439501_2764691_2",
+        "totalSeconds": 17.858,
+        "dataSeconds": 13.878,
+        "datasetConstructSeconds": 4.546
+      }
+    ],
+    "datasetConstructMedianSeconds": 4.497
+  },
+  "primaryFiveYearContract": {
+    "runId": "btr_1788646914659_2773606_0",
+    "totalReturn": 0.9219861819172002,
+    "tradeCount": 26088,
+    "canonicalSha256": "b42fea66237d06eadb24f6b8c9e2760e7319fe3699f315b99e01f433ef2aa234",
+    "resultStoreSha256": "9ccf0c0fc6f5d72e974381ad4cd09a80241d7de99f2649f2b01736f7c80dc2c7",
+    "coldTotalSeconds": 16.322,
+    "coldDataSeconds": 12.815,
+    "datasetConstructSeconds": 3.899,
+    "hotTotalMedianSeconds": 3.402,
+    "hotEngineMedianSeconds": 2.792,
+    "terminalAuditStatus": "clean",
+    "resultConsistent": true
+  },
+  "secondaryFiveYearContract": {
+    "runId": "btr_1788646986983_2773606_4",
+    "totalReturn": 1.1342962298106998,
+    "tradeCount": 19404,
+    "canonicalSha256": "0dbd3fad624097c673c4a5ec2f545f95e9c21d1d5337bb2b48ffeb22b16cb2b9",
+    "resultStoreSha256": "dd744dd6710bc28bb4ecd9ca912051292b9a1eefa0056e02c62a38cad85cf435",
+    "coldTotalSeconds": 15.292,
+    "coldDataSeconds": 12.238,
+    "datasetConstructSeconds": 3.895,
+    "terminalAuditStatus": "clean",
+    "resultConsistent": true
+  },
+  "genericRankFiveYearContract": {
+    "runId": "btr_1788647058500_2773606_8",
+    "rankBy": "free_float_cap",
+    "totalReturn": 0.7140315244542004,
+    "tradeCount": 21876,
+    "canonicalSha256": "84367993911b42437939aad88f29379d007af6f5f171667ff7ad6677dd488fd2",
+    "resultStoreSha256": "865c00f81d17153285e391eb48ea51487e33fd3bba55a6c2a0ca280b07511077",
+    "coldTotalSeconds": 16.739,
+    "coldDataSeconds": 11.512,
+    "datasetConstructSeconds": 3.663,
+    "terminalAuditStatus": "clean",
+    "resultConsistent": true
+  },
+  "minuteContract": {
+    "runId": "btr_1788647032685_2773606_6",
+    "totalReturn": 0.03473222656500008,
+    "tradeCount": 156,
+    "canonicalSha256": "457c086b1bca784fe83f447bb22451925e8f022456bb0fc7b54237a7a7886849",
+    "resultStoreSha256": "a77894eecf4e6a49168a38ff83cf27226e274b6850e10196892efa7d95be91cd",
+    "coldTotalSeconds": 0.814,
+    "hotTotalSeconds": 0.543,
+    "terminalAuditStatus": "clean",
+    "resultConsistent": true
+  },
+  "performance": {
+    "candidateDatasetConstructSeconds": [3.899, 3.895, 3.663],
+    "candidateDatasetConstructMedianSeconds": 3.895,
+    "datasetConstructMedianImprovementPercent": 13.386702,
+    "primaryColdDataImprovementPercent": 7.659605,
+    "primaryColdTotalImprovementPercent": 8.601187,
+    "wallComparisonsIncludeHostLoadVariance": true
+  },
+  "memory": {
+    "singleDatasetCandidateCurrentBytes": 11495055360,
+    "singleDatasetBaselineCurrentBytes": 11470495744,
+    "comparison": "within allocator and concurrent workload variance; no memory reduction claimed",
+    "repeatedManualCacheClearHighWaterExcluded": true
+  },
+  "testGate": {
+    "corePassed": 538,
+    "ignoredManualBenchmarks": 8,
+    "failed": 0
+  },
+  "remoteArtifacts": [
+    "/srv/fidc/canonical/run/fidc-private/evidence/symbol-id-series-primary-five-year-20260906.json",
+    "/srv/fidc/canonical/run/fidc-private/evidence/symbol-id-series-secondary-five-year-20260906.json",
+    "/srv/fidc/canonical/run/fidc-private/evidence/symbol-id-series-generic-rank-five-year-20260906.json",
+    "/srv/fidc/canonical/run/fidc-private/evidence/symbol-id-series-minute-20260906.json"
+  ],
+  "acceptance": {
+    "status": "accepted",
+    "reason": "three independent cold five-year builds reduce DataSet construction time, four distinct strategy contracts preserve exact canonical outputs, and duplicate string-keyed series indexes are removed rather than hidden behind another cache"
+  }
+}