diff --git a/index.js b/index.js
index 4de1b72..249dcba 100644
--- a/index.js
+++ b/index.js
@@ -3083,6 +3083,21 @@ async function exportAuthoritySqlSnapshotProbe(chatId = "", settings = getSettin
   }
 }
 
+async function exportAuthoritySqlSnapshotForCheckpoint(chatId = "", settings = getSettings()) {
+  const normalizedChatId = normalizeChatIdCandidate(chatId);
+  if (!normalizedChatId) return null;
+  const db = new AuthorityGraphStore(
+    normalizedChatId,
+    buildAuthorityGraphStoreOptions(settings),
+  );
+  try {
+    await db.open();
+    return await db.exportSnapshot({ includeTombstones: false });
+  } finally {
+    await db.close?.().catch(() => null);
+  }
+}
+
 async function readAuthorityTriviumStat({
   chatId = "",
   collectionId = "",
@@ -3346,33 +3361,68 @@ async function writeAuthorityCheckpointFromCurrentGraph(options = {}) {
     };
   }
 
-  ensureCurrentGraphRuntimeState();
-  if (!currentGraph) {
-    return {
-      success: false,
-      error: "Authority runtime graph unavailable",
-    };
+  const reason = String(options.reason || "manual-authority-checkpoint");
+  const authoritySqlPrimary = shouldUseAuthorityGraphStore(settings, capability);
+  let checkpointGraph = null;
+  let revision = 0;
+  let integrity = "";
+  let checkpointSource = "runtime";
+
+  if (authoritySqlPrimary) {
+    try {
+      const sqlSnapshot = await exportAuthoritySqlSnapshotForCheckpoint(chatId, settings);
+      const sqlRevision = Number(sqlSnapshot?.meta?.revision || 0);
+      if (!Number.isFinite(sqlRevision) || sqlRevision <= 0) {
+        return {
+          success: false,
+          error: "authority-sql-checkpoint-source-empty",
+        };
+      }
+      checkpointGraph = buildGraphFromSnapshot(sqlSnapshot, { chatId });
+      revision = sqlRevision;
+      integrity =
+        normalizeChatIdCandidate(options.integrity) ||
+        normalizeChatIdCandidate(sqlSnapshot?.meta?.integrity) ||
+        getChatMetadataIntegrity(getContext()) ||
+        graphPersistenceState.metadataIntegrity;
+      checkpointSource = "authority-sql";
+    } catch (error) {
+      return {
+        success: false,
+        error: error?.message || String(error) || "authority-sql-checkpoint-source-failed",
+      };
+    }
   }
 
-  const revision = Math.max(
-    1,
-    Number(options.revision || 0),
-    Number(currentGraph?.meta?.revision || 0),
-    Number(getGraphPersistedRevision(currentGraph) || 0),
-    Number(graphPersistenceState.revision || 0),
-  );
-  const integrity =
-    normalizeChatIdCandidate(options.integrity) ||
-    normalizeChatIdCandidate(getGraphPersistenceMeta(currentGraph)?.integrity) ||
-    getChatMetadataIntegrity(getContext()) ||
-    graphPersistenceState.metadataIntegrity;
-  const reason = String(options.reason || "manual-authority-checkpoint");
-  const checkpoint = buildLukerGraphCheckpointV2(currentGraph, {
+  if (!checkpointGraph) {
+    ensureCurrentGraphRuntimeState();
+    if (!currentGraph) {
+      return {
+        success: false,
+        error: "Authority runtime graph unavailable",
+      };
+    }
+    checkpointGraph = currentGraph;
+    revision = Math.max(
+      1,
+      Number(options.revision || 0),
+      Number(currentGraph?.meta?.revision || 0),
+      Number(getGraphPersistedRevision(currentGraph) || 0),
+      Number(graphPersistenceState.revision || 0),
+    );
+    integrity =
+      normalizeChatIdCandidate(options.integrity) ||
+      normalizeChatIdCandidate(getGraphPersistenceMeta(currentGraph)?.integrity) ||
+      getChatMetadataIntegrity(getContext()) ||
+      graphPersistenceState.metadataIntegrity;
+  }
+
+  const checkpoint = buildLukerGraphCheckpointV2(checkpointGraph, {
     revision,
     chatId,
     integrity,
     reason,
-    storageTier: "authority-sql-primary",
+    storageTier: authoritySqlPrimary ? "authority-sql-primary" : "runtime-checkpoint",
     persistedAt: updatedAt,
   });
   if (!checkpoint) {
@@ -3410,6 +3460,7 @@ async function writeAuthorityCheckpointFromCurrentGraph(options = {}) {
       path: writeResult.path,
       revision,
       checkpointRevision: Number(checkpoint.revision || revision || 0),
+      source: checkpointSource,
       auditSummary: auditResult?.audit?.summary || null,
       auditActions: auditResult?.audit?.actions || [],
     },
diff --git a/tests/graph-persistence.mjs b/tests/graph-persistence.mjs
index d5383d2..dd82cea 100644
--- a/tests/graph-persistence.mjs
+++ b/tests/graph-persistence.mjs
@@ -155,6 +155,7 @@ function normalizeAuthorityVectorConfig(settings = {}, overrides = {}) {
 function createAuthorityBlobAdapter() {
   return {
     async writeJson(path = "", payload = null) {
+      globalThis.__authorityBlobWrites?.set(String(path || ""), structuredClone(payload));
       return { path, payload, written: true };
     },
   };
@@ -351,6 +352,8 @@ async function createGraphPersistenceHarness({
   }
 
   const authoritySnapshotMap = new Map();
+  const authorityBlobWrites = new Map();
+  globalThis.__authorityBlobWrites = authorityBlobWrites;
 
   function getAuthoritySnapshotForChat(targetChatId = "") {
     const normalizedChatId = String(targetChatId || "");
@@ -673,6 +676,7 @@ async function createGraphPersistenceHarness({
     ),
     __indexedDbSnapshots: indexedDbSnapshotMap,
     __authoritySnapshots: authoritySnapshotMap,
+    __authorityBlobWrites: authorityBlobWrites,
     __getAuthoritySnapshotForChat: getAuthoritySnapshotForChat,
     __setAuthoritySnapshotForChat: setAuthoritySnapshotForChat,
     sessionStorage: storage,
@@ -1645,6 +1649,7 @@ result = {
   persistExtractionBatchResult,
   shouldUseAuthorityJobs,
   shouldUseAuthorityGraphStore,
+  writeAuthorityCheckpointFromCurrentGraph,
   onRebuildLocalCacheFromLukerSidecar,
   saveGraphToIndexedDb,
   cloneGraphForPersistence,
@@ -1735,6 +1740,12 @@ result = {
   getAuthoritySnapshotForChat(chatId) {
     return globalThis.__getAuthoritySnapshotForChat(chatId);
   },
+  getAuthorityBlobWrites() {
+    return Array.from(globalThis.__authorityBlobWrites.entries()).map(([path, payload]) => [
+      path,
+      structuredClone(payload),
+    ]);
+  },
 };
       `,
     ].join("\n"),
@@ -4779,6 +4790,28 @@ result = {
     result.revision,
     "Authority SQL snapshot should receive the accepted persist revision",
   );
+  harness.api.setCurrentGraph(
+    stampPersistedGraph(
+      createMeaningfulGraph(chatId, "runtime-stale-checkpoint"),
+      {
+        revision: 1,
+        integrity: persistenceChatId,
+        chatId,
+        reason: "runtime-stale-checkpoint",
+      },
+    ),
+  );
+  const checkpointResult = await harness.api.writeAuthorityCheckpointFromCurrentGraph({
+    reason: "authority-sql-checkpoint-source-test",
+  });
+  assert.equal(checkpointResult.success, true);
+  assert.equal(checkpointResult.result.source, "authority-sql");
+  assert.equal(checkpointResult.result.checkpointRevision, result.revision);
+  const checkpointPayload = Array.from(globalThis.__authorityBlobWrites.entries()).at(-1)?.[1];
+  assert.equal(checkpointPayload?.revision, result.revision);
+  const checkpointGraph = deserializeGraph(checkpointPayload?.serializedGraph || "{}");
+  assert.equal(checkpointGraph.nodes[0]?.fields?.title, "事件-luker-authority-sql");
+  assert.notEqual(checkpointGraph.nodes[0]?.fields?.title, "事件-runtime-stale-checkpoint");
 }
 
 {