diff --git a/services/session-ingest/src/dos/session-metrics.test.ts b/services/session-ingest/src/dos/session-metrics.test.ts
index 82689150f5..c85fbcd845 100644
--- a/services/session-ingest/src/dos/session-metrics.test.ts
+++ b/services/session-ingest/src/dos/session-metrics.test.ts
@@ -148,6 +148,31 @@ describe('computeSessionMetrics', () => {
     expect(result.totalCost).toBeCloseTo(0.15);
   });
 
+  it('clamps negative token and cost totals to 0', () => {
+    const items = [
+      makeItem('message', {
+        role: 'assistant',
+        time: { created: 1000 },
+        tokens: {
+          input: -10,
+          output: -20,
+          reasoning: -30,
+          cache: { read: -40, write: -50 },
+        },
+        cost: -0.05,
+      }),
+    ];
+    const result = computeSessionMetrics(items, 'completed');
+    expect(result.totalTokens).toEqual({
+      input: 0,
+      output: 0,
+      reasoning: 0,
+      cacheRead: 0,
+      cacheWrite: 0,
+    });
+    expect(result.totalCost).toBe(0);
+  });
+
   it('counts compaction parts', () => {
     const items = [
       makeItem('part', { type: 'compaction', auto: true }),
diff --git a/services/session-ingest/src/dos/session-metrics.ts b/services/session-ingest/src/dos/session-metrics.ts
index db2ac9bbdd..7c6f456be1 100644
--- a/services/session-ingest/src/dos/session-metrics.ts
+++ b/services/session-ingest/src/dos/session-metrics.ts
@@ -147,6 +147,10 @@ function freshAccumulator(): Accumulator {
   };
 }
 
+function nonNegative(value: number): number {
+  return Math.max(0, value);
+}
+
 function processKiloMeta(acc: Accumulator, raw: unknown) {
   const parsed = KiloMetaSchema.safeParse(raw);
   if (!parsed.success) return;
@@ -303,8 +307,14 @@ export function computeSessionMetrics(
     totalErrors: acc.totalErrors,
     errorsByType: acc.errorsByType,
     stuckToolCallCount,
-    totalTokens: acc.totalTokens,
-    totalCost: acc.totalCost,
+    totalTokens: {
+      input: nonNegative(acc.totalTokens.input),
+      output: nonNegative(acc.totalTokens.output),
+      reasoning: nonNegative(acc.totalTokens.reasoning),
+      cacheRead: nonNegative(acc.totalTokens.cacheRead),
+      cacheWrite: nonNegative(acc.totalTokens.cacheWrite),
+    },
+    totalCost: nonNegative(acc.totalCost),
     compactionCount: acc.compactionCount,
     autoCompactionCount: acc.autoCompactionCount,
     terminationReason: closeReason,
diff --git a/services/session-ingest/src/queue-consumer.ts b/services/session-ingest/src/queue-consumer.ts
index a80a824c99..becbebb223 100644
--- a/services/session-ingest/src/queue-consumer.ts
+++ b/services/session-ingest/src/queue-consumer.ts
@@ -20,6 +20,10 @@ export interface IngestQueueMessage {
   ingestedAt: number;
 }
 
+function elapsedMs(startedAt: number): number {
+  return Date.now() - startedAt;
+}
+
 /**
  * Creates a streaming item extractor that uses a low-level Tokenizer to parse
  * items from `$.data[]` one at a time, with a per-item byte budget.
@@ -194,6 +198,7 @@ async function processMessage(
     while (pending.length > 0) {
       const rawItem = pending.shift();
       if (!rawItem) break;
+      const itemStartedAt = Date.now();
       try {
         await processItem(
           env,
@@ -209,6 +214,7 @@ async function processMessage(
         console.error('Error processing single item in queue consumer, continuing', {
           r2Key,
           type: rawItem['type'],
+          durationMs: elapsedMs(itemStartedAt),
           error: err instanceof Error ? err.message : String(err),
         });
       }
@@ -253,25 +259,45 @@ async function processItem(
 
   const item = parsed.data;
   const { item_id } = getItemIdentity(item);
+  const startedAt = Date.now();
 
   // Check if item data exceeds DO SQLite row limit (use byte length for non-ASCII safety)
   const itemDataJson = JSON.stringify(item.data);
+  const itemDataBytes = new TextEncoder().encode(itemDataJson).byteLength;
   let r2References: Record<string, string> | undefined;
-  if (new TextEncoder().encode(itemDataJson).byteLength > MAX_INGEST_ITEM_BYTES) {
+  let r2PutMs = 0;
+  if (itemDataBytes > MAX_INGEST_ITEM_BYTES) {
     const itemR2Key = `items/${kiloUserId}/${sessionId}/${item_id}/${ingestedAt}`;
+    const r2PutStartedAt = Date.now();
     await env.SESSION_INGEST_R2.put(itemR2Key, itemDataJson);
+    r2PutMs = elapsedMs(r2PutStartedAt);
     r2References = { [item_id]: itemR2Key };
   }
 
+  const doIngestStartedAt = Date.now();
   const ingestResult = await withDORetry(
     () => getSessionIngestDO(env, { kiloUserId, sessionId }),
     stub => stub.ingest([item], kiloUserId, sessionId, ingestVersion, ingestedAt, r2References),
     'SessionIngestDO.ingest'
   );
+  const doIngestMs = elapsedMs(doIngestStartedAt);
 
   for (const change of ingestResult.changes) {
     mergedChanges.set(change.name, change.value);
   }
+
+  const durationMs = elapsedMs(startedAt);
+  console.info('session-ingest processItem timing', {
+    r2Key,
+    sessionId,
+    type: item.type,
+    itemDataBytes,
+    r2Referenced: r2References !== undefined,
+    r2PutMs,
+    doIngestMs,
+    durationMs,
+    changes: ingestResult.changes.length,
+  });
 }
 
 type SessionMetadataUpdates = Partial<
@@ -349,6 +375,7 @@ async function applyMetadataChanges(
     mergedChanges.has('gitBranch') ||
     parentSessionId !== undefined;
 
+  const transactionStartedAt = Date.now();
   const notification = await db.transaction(async tx => {
     const statusChange =
       status === undefined
@@ -454,6 +481,12 @@ async function applyMetadataChanges(
       session: mapSessionEventRow(persistedRow),
     };
   });
+  const transactionMs = elapsedMs(transactionStartedAt);
+  console.info('session-ingest applyMetadataChanges transaction timing', {
+    sessionId,
+    metadataChanges: mergedChanges.size,
+    transactionMs,
+  });
 
   if (!notification) return;
 
diff --git a/services/session-ingest/src/session-events.ts b/services/session-ingest/src/session-events.ts
index 2fdb33d06c..61b448bfe8 100644
--- a/services/session-ingest/src/session-events.ts
+++ b/services/session-ingest/src/session-events.ts
@@ -52,9 +52,16 @@ export function notifyUserSessionEvent(
   ctx?: { waitUntil(promise: Promise<unknown>): void }
 ): void {
   const notify = async () => {
+    const startedAt = Date.now();
     try {
       const stub = getUserConnectionDO(env, { kiloUserId });
       await stub.notifySessionEvent(event);
+      const durationMs = Date.now() - startedAt;
+      console.info('session-ingest notify timing', {
+        event: event.type,
+        sessionId: 'session' in event.data ? event.data.session.sessionId : event.data.sessionId,
+        durationMs,
+      });
     } catch (error) {
       console.error('Failed to notify session event (non-fatal)', {
         event: event.type,