diff --git a/lambda/po-sync/index.ts b/lambda/po-sync/index.ts
new file mode 100644
index 0000000..be90186
--- /dev/null
+++ b/lambda/po-sync/index.ts
@@ -0,0 +1,247 @@
+import {
+  DynamoDBClient,
+  ScanCommand,
+  type AttributeValue,
+} from '@aws-sdk/client-dynamodb';
+import {
+  S3Client,
+  PutObjectCommand,
+  ListObjectsV2Command,
+  DeleteObjectsCommand,
+} from '@aws-sdk/client-s3';
+import {
+  BedrockAgentClient,
+  StartIngestionJobCommand,
+} from '@aws-sdk/client-bedrock-agent';
+
+const dynamo = new DynamoDBClient({});
+const s3 = new S3Client({});
+const bedrockAgent = new BedrockAgentClient({ region: process.env.REGION! });
+
+const S3_PREFIX = 'purchase-orders/';
+
+/** Unwrap a DynamoDB AttributeValue to a plain JS value. */
+function unwrap(attr: AttributeValue | undefined): any {
+  if (!attr) return undefined;
+  if (attr.S !== undefined) return attr.S;
+  if (attr.N !== undefined) return Number(attr.N);
+  if (attr.BOOL !== undefined) return attr.BOOL;
+  if (attr.NULL) return null;
+  if (attr.L) return attr.L.map(unwrap);
+  if (attr.M) {
+    const obj: Record<string, any> = {};
+    for (const [k, v] of Object.entries(attr.M)) {
+      obj[k] = unwrap(v);
+    }
+    return obj;
+  }
+  return undefined;
+}
+
+/** Convert a raw DynamoDB item to a plain JS object. */
+function itemToRecord(item: Record<string, AttributeValue>): Record<string, any> {
+  const rec: Record<string, any> = {};
+  for (const [k, v] of Object.entries(item)) {
+    rec[k] = unwrap(v);
+  }
+  return rec;
+}
+
+/** Render a PO record as a human-readable markdown document. */
+function poToMarkdown(po: Record<string, any>): string {
+  const lines: string[] = [];
+
+  lines.push(`# Purchase Order ${po.po_number}`);
+  lines.push('');
+
+  if (po.po_status) lines.push(`**Status:** ${po.po_status}`);
+  if (po.email_type === 'cancellation') lines.push(`**Cancelled:** ${po.cancelled_at ?? 'yes'}`);
+  if (po.source_system) lines.push(`**Source:** ${po.source_system}`);
+  if (po.order_date) lines.push(`**Order Date:** ${po.order_date}`);
+  if (po.revision_date) lines.push(`**Revision Date:** ${po.revision_date}`);
+  if (po.payment_terms) lines.push(`**Payment Terms:** ${po.payment_terms}`);
+  if (po.requisition_number) lines.push(`**Requisition #:** ${po.requisition_number}`);
+  if (po.department) lines.push(`**Department:** ${po.department}`);
+  if (po.submitted_by) lines.push(`**Submitted By:** ${po.submitted_by}`);
+  if (po.on_behalf_of) lines.push(`**On Behalf Of:** ${po.on_behalf_of}`);
+
+  if (po.total_amount !== undefined) {
+    lines.push(`**Total:** ${po.currency ?? 'USD'} ${po.total_amount}`);
+  }
+
+  // Supplier
+  if (po.supplier?.name) {
+    lines.push('');
+    lines.push(`## Supplier`);
+    lines.push(`**Name:** ${po.supplier.name}`);
+  }
+
+  // Ship-to
+  const ship = po.ship_to;
+  if (ship) {
+    lines.push('');
+    lines.push(`## Ship To`);
+    if (ship.name) lines.push(`**Name:** ${ship.name}`);
+    if (ship.address) lines.push(`**Address:** ${ship.address}`);
+    if (ship.location_code) lines.push(`**Location Code:** ${ship.location_code}`);
+    if (ship.attn) lines.push(`**Attn:** ${ship.attn}`);
+  }
+
+  // Line items
+  const items = po.line_items;
+  if (Array.isArray(items) && items.length > 0) {
+    lines.push('');
+    lines.push('## Line Items');
+    lines.push('');
+    lines.push('| Description | Amount | Currency | Need By | Category | Account Code | Period |');
+    lines.push('|---|---|---|---|---|---|---|');
+    for (const li of items) {
+      const row = [
+        li.description ?? '',
+        li.amount ?? '',
+        li.currency ?? '',
+        li.need_by ?? '',
+        li.category ?? '',
+        li.account_code ?? '',
+        li.period ?? '',
+      ];
+      lines.push(`| ${row.join(' | ')} |`);
+    }
+  }
+
+  lines.push('');
+  return lines.join('\n');
+}
+
+async function scanAllPOs(): Promise<Record<string, any>[]> {
+  const records: Record<string, any>[] = [];
+  let lastKey: Record<string, AttributeValue> | undefined;
+
+  do {
+    const res = await dynamo.send(
+      new ScanCommand({
+        TableName: process.env.PO_TABLE!,
+        ExclusiveStartKey: lastKey,
+      }),
+    );
+    for (const item of res.Items ?? []) {
+      records.push(itemToRecord(item));
+    }
+    lastKey = res.LastEvaluatedKey;
+  } while (lastKey);
+
+  return records;
+}
+
+/** List all existing S3 keys under the purchase-orders/ prefix. */
+async function listExistingKeys(bucket: string): Promise<Set<string>> {
+  const keys = new Set<string>();
+  let continuationToken: string | undefined;
+
+  do {
+    const res = await s3.send(
+      new ListObjectsV2Command({
+        Bucket: bucket,
+        Prefix: S3_PREFIX,
+        ContinuationToken: continuationToken,
+      }),
+    );
+    for (const obj of res.Contents ?? []) {
+      if (obj.Key) keys.add(obj.Key);
+    }
+    continuationToken = res.NextContinuationToken;
+  } while (continuationToken);
+
+  return keys;
+}
+
+/** Delete S3 keys that no longer correspond to active records. */
+async function deleteStaleKeys(bucket: string, keys: string[]): Promise<void> {
+  if (keys.length === 0) return;
+
+  for (let i = 0; i < keys.length; i += 1000) {
+    await s3.send(
+      new DeleteObjectsCommand({
+        Bucket: bucket,
+        Delete: { Objects: keys.slice(i, i + 1000).map((Key) => ({ Key })) },
+      }),
+    );
+  }
+  console.log(`Deleted ${keys.length} stale PO file(s) from S3`);
+}
+
+export const handler = async (): Promise<void> => {
+  const bucket = process.env.KB_BUCKET_NAME!;
+  const kbId = process.env.KNOWLEDGE_BASE_ID!;
+  const dsId = process.env.DATA_SOURCE_ID!;
+
+  console.log('Listing existing PO files in S3...');
+  const existingKeys = await listExistingKeys(bucket);
+  console.log(`Found ${existingKeys.size} existing file(s) in S3`);
+
+  console.log('Scanning purchase-orders table...');
+  const pos = await scanAllPOs();
+  console.log(`Found ${pos.length} purchase order(s)`);
+
+  const writtenKeys = new Set<string>();
+  let synced = 0;
+  let failed = 0;
+
+  // Upload in batches of 25 concurrent requests
+  const CONCURRENCY = 25;
+  for (let i = 0; i < pos.length; i += CONCURRENCY) {
+    const batch = pos.slice(i, i + CONCURRENCY);
+    const results = await Promise.allSettled(
+      batch.map(async (po) => {
+        const poNumber = po.po_number;
+        if (!poNumber) {
+          console.warn('Skipping record with no po_number');
+          throw new Error('no po_number');
+        }
+
+        const md = poToMarkdown(po);
+        const safeKey = poNumber.replace(/[^a-zA-Z0-9._-]/g, '_');
+        const key = `${S3_PREFIX}${safeKey}.md`;
+
+        await s3.send(
+          new PutObjectCommand({
+            Bucket: bucket,
+            Key: key,
+            Body: md,
+            ContentType: 'text/markdown',
+            Metadata: { 'po-number': poNumber },
+          }),
+        );
+
+        return key;
+      }),
+    );
+
+    for (const r of results) {
+      if (r.status === 'fulfilled') {
+        writtenKeys.add(r.value);
+        synced++;
+      } else {
+        console.error(`Failed to sync PO:`, r.reason);
+        failed++;
+      }
+    }
+  }
+
+  console.log(`Upload complete. ${synced} synced, ${failed} failed.`);
+
+  // Delete S3 files for records that no longer exist in DynamoDB
+  const staleKeys = [...existingKeys].filter((k) => !writtenKeys.has(k));
+  await deleteStaleKeys(bucket, staleKeys);
+
+  console.log('Triggering Bedrock KB ingestion job...');
+  const ingestionRes = await bedrockAgent.send(
+    new StartIngestionJobCommand({
+      knowledgeBaseId: kbId,
+      dataSourceId: dsId,
+    }),
+  );
+  console.log(
+    `Ingestion job started: ${ingestionRes.ingestionJob?.ingestionJobId}`,
+  );
+};
diff --git a/lib/constructs/po-sync.ts b/lib/constructs/po-sync.ts
new file mode 100644
index 0000000..5e6772a
--- /dev/null
+++ b/lib/constructs/po-sync.ts
@@ -0,0 +1,71 @@
+import * as cdk from 'aws-cdk-lib';
+import { Construct } from 'constructs';
+import * as lambda from 'aws-cdk-lib/aws-lambda';
+import * as lambdaNodejs from 'aws-cdk-lib/aws-lambda-nodejs';
+import * as s3 from 'aws-cdk-lib/aws-s3';
+import * as dynamodb from 'aws-cdk-lib/aws-dynamodb';
+import * as events from 'aws-cdk-lib/aws-events';
+import * as targets from 'aws-cdk-lib/aws-events-targets';
+import * as iam from 'aws-cdk-lib/aws-iam';
+import * as path from 'path';
+
+export interface PoSyncProps {
+  region: string;
+  kbDocsBucket: s3.Bucket;
+  knowledgeBaseId: string;
+  dataSourceId: string;
+}
+
+export class PoSyncConstruct extends Construct {
+  public readonly syncLambda: lambdaNodejs.NodejsFunction;
+
+  constructor(scope: Construct, id: string, props: PoSyncProps) {
+    super(scope, id);
+
+    // Import the purchase-orders DynamoDB table (owned by po-ingest stack)
+    const poTable = dynamodb.Table.fromTableName(
+      this, 'PurchaseOrdersTable', 'purchase-orders',
+    );
+
+    // Lambda — scans purchase-orders table, uploads markdown to S3, triggers KB ingestion
+    this.syncLambda = new lambdaNodejs.NodejsFunction(this, 'SyncLambda', {
+      functionName: 'seahaven-po-sync',
+      entry: path.join(__dirname, '../../lambda/po-sync/index.ts'),
+      runtime: lambda.Runtime.NODEJS_22_X,
+      memorySize: 512,
+      timeout: cdk.Duration.minutes(15),
+      environment: {
+        PO_TABLE: poTable.tableName,
+        KB_BUCKET_NAME: props.kbDocsBucket.bucketName,
+        KNOWLEDGE_BASE_ID: props.knowledgeBaseId,
+        DATA_SOURCE_ID: props.dataSourceId,
+        REGION: props.region,
+      },
+    });
+
+    // Grant read access to the purchase-orders table
+    poTable.grantReadData(this.syncLambda);
+
+    // Grant read/write to the KB docs bucket (read to list+delete old, write new)
+    props.kbDocsBucket.grantReadWrite(this.syncLambda);
+
+    // Allow Lambda to start a Bedrock KB ingestion job
+    this.syncLambda.addToRolePolicy(
+      new iam.PolicyStatement({
+        actions: ['bedrock:StartIngestionJob'],
+        resources: [
+          `arn:aws:bedrock:${props.region}:*:knowledge-base/${props.knowledgeBaseId}`,
+        ],
+      }),
+    );
+
+    // EventBridge rule — fires daily at 02:00 UTC
+    const dailyRule = new events.Rule(this, 'DailySyncRule', {
+      ruleName: 'seahaven-po-daily-sync',
+      description: 'Daily purchase-orders → KB sync at 02:00 UTC',
+      schedule: events.Schedule.cron({ minute: '0', hour: '2' }),
+    });
+
+    dailyRule.addTarget(new targets.LambdaFunction(this.syncLambda));
+  }
+}
diff --git a/lib/seahaven-slack-bot-stack.ts b/lib/seahaven-slack-bot-stack.ts
index f5cbca0..daa0d82 100644
--- a/lib/seahaven-slack-bot-stack.ts
+++ b/lib/seahaven-slack-bot-stack.ts
@@ -5,6 +5,7 @@ import { KnowledgeBaseConstruct } from './constructs/knowledge-base';
 import { BedrockAgentConstruct } from './constructs/bedrock-agent';
 import { SlackHandlerConstruct } from './constructs/slack-handler';
 import { NotionSyncConstruct } from './constructs/notion-sync';
+import { PoSyncConstruct } from './constructs/po-sync';
 
 export class SeahavenSlackBotStack extends cdk.Stack {
   constructor(scope: Construct, id: string, props?: cdk.StackProps) {
@@ -44,6 +45,14 @@ export class SeahavenSlackBotStack extends cdk.Stack {
       dataSourceId: knowledgeBase.dataSource.dataSourceId,
     });
 
+    // ── Purchase Orders → KB daily sync (EventBridge + Lambda) ────────────────
+    new PoSyncConstruct(this, 'PoSync', {
+      region: this.region,
+      kbDocsBucket: knowledgeBase.docsBucket,
+      knowledgeBaseId: knowledgeBase.knowledgeBase.knowledgeBaseId,
+      dataSourceId: knowledgeBase.dataSource.dataSourceId,
+    });
+
     // ── Slack webhook handler (API Gateway + Lambda) ───────────────────────────
     new SlackHandlerConstruct(this, 'SlackHandler', {
       accountId: this.account,