diff --git a/packages/ql3-local-application/src/production-process/legacyDataApplicationCommitment.ts b/packages/ql3-local-application/src/production-process/legacyDataApplicationCommitment.ts
new file mode 100644
index 00000000..c1f6626d
--- /dev/null
+++ b/packages/ql3-local-application/src/production-process/legacyDataApplicationCommitment.ts
@@ -0,0 +1,160 @@
+import fs from 'node:fs';
+
+import {
+  LocalDataDirectoryApplicationCommitError,
+  normalizeLocalDataDirectoryApplicationCommit,
+  type LocalDataDirectoryApplicationCommit,
+} from '@qinglong/local-sqlite/data-directory-application-commit';
+
+import {
+  LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V4,
+  type LocalApplicationProcessConfig,
+} from './processConfig';
+
+const MAX_COMMIT_BYTES = 64 * 1024;
+
+export class LocalApplicationLegacyDataCommitmentError extends Error {
+  readonly code = 'QL3_LOCAL_APPLICATION_LEGACY_DATA_COMMITMENT_INVALID';
+
+  constructor(message: string, options?: ErrorOptions) {
+    super(
+      `Local application legacy data commitment is invalid: ${message}`,
+      options,
+    );
+    this.name = 'LocalApplicationLegacyDataCommitmentError';
+  }
+}
+
+function currentIdentity(): Readonly<{ uid: number; gid: number }> {
+  if (
+    typeof process.getuid !== 'function' ||
+    typeof process.geteuid !== 'function' ||
+    typeof process.getgid !== 'function' ||
+    typeof process.getegid !== 'function' ||
+    process.getuid() !== process.geteuid() ||
+    process.getgid() !== process.getegid()
+  ) {
+    throw new LocalApplicationLegacyDataCommitmentError(
+      'real and effective POSIX identities must match',
+    );
+  }
+  return Object.freeze({ uid: process.getuid(), gid: process.getgid() });
+}
+
+function readCommit(
+  filePath: string,
+): Readonly<LocalDataDirectoryApplicationCommit> {
+  const identity = currentIdentity();
+  let descriptor: number | undefined;
+  let bytes: Buffer | undefined;
+  try {
+    const before = fs.lstatSync(filePath, { bigint: true });
+    descriptor = fs.openSync(
+      filePath,
+      fs.constants.O_RDONLY | (fs.constants.O_NOFOLLOW ?? 0),
+    );
+    const opened = fs.fstatSync(descriptor, { bigint: true });
+    if (
+      !opened.isFile() ||
+      opened.isSymbolicLink() ||
+      opened.dev !== before.dev ||
+      opened.ino !== before.ino ||
+      Number(opened.uid) !== identity.uid ||
+      Number(opened.gid) !== identity.gid ||
+      (Number(opened.mode) & 0o777) !== 0o600 ||
+      opened.nlink !== 1n ||
+      opened.size < 2n ||
+      opened.size > BigInt(MAX_COMMIT_BYTES)
+    ) {
+      throw new LocalApplicationLegacyDataCommitmentError(
+        'commit file identity is invalid',
+      );
+    }
+    bytes = Buffer.alloc(Number(opened.size));
+    let offset = 0;
+    while (offset < bytes.byteLength) {
+      const count = fs.readSync(
+        descriptor,
+        bytes,
+        offset,
+        bytes.byteLength - offset,
+        offset,
+      );
+      if (count === 0) break;
+      offset += count;
+    }
+    const after = fs.fstatSync(descriptor, { bigint: true });
+    if (
+      offset !== bytes.byteLength ||
+      after.dev !== opened.dev ||
+      after.ino !== opened.ino ||
+      after.size !== opened.size ||
+      after.mtimeNs !== opened.mtimeNs ||
+      after.ctimeNs !== opened.ctimeNs ||
+      after.uid !== opened.uid ||
+      after.gid !== opened.gid ||
+      after.mode !== opened.mode ||
+      after.nlink !== opened.nlink
+    ) {
+      throw new LocalApplicationLegacyDataCommitmentError(
+        'commit file identity changed while reading',
+      );
+    }
+    let value: unknown;
+    try {
+      value = JSON.parse(
+        new TextDecoder('utf-8', { fatal: true }).decode(bytes),
+      );
+    } catch (error) {
+      throw new LocalApplicationLegacyDataCommitmentError(
+        'commit file is not canonical UTF-8 JSON',
+        { cause: error },
+      );
+    }
+    try {
+      return normalizeLocalDataDirectoryApplicationCommit(value);
+    } catch (error) {
+      if (error instanceof LocalDataDirectoryApplicationCommitError) {
+        throw new LocalApplicationLegacyDataCommitmentError(
+          'commit document is invalid',
+          { cause: error },
+        );
+      }
+      throw error;
+    }
+  } catch (error) {
+    if (error instanceof LocalApplicationLegacyDataCommitmentError) throw error;
+    throw new LocalApplicationLegacyDataCommitmentError(
+      'commit file cannot be read',
+      { cause: error },
+    );
+  } finally {
+    bytes?.fill(0);
+    if (descriptor !== undefined) fs.closeSync(descriptor);
+  }
+}
+
+export function verifyLocalApplicationLegacyDataCommitment(
+  config: Readonly<LocalApplicationProcessConfig>,
+): Readonly<LocalDataDirectoryApplicationCommit> | undefined {
+  if (config.schema !== LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V4) {
+    return undefined;
+  }
+  const binding = config.legacyDataApplication;
+  if (binding === undefined) {
+    throw new LocalApplicationLegacyDataCommitmentError(
+      'v4 binding is unavailable',
+    );
+  }
+  const commit = readCommit(binding.commitPath);
+  if (
+    commit.profile !== config.profile ||
+    commit.commitDigest !== binding.expectedCommitDigest ||
+    commit.receiptDigest !== binding.expectedReceiptDigest
+  ) {
+    throw new LocalApplicationLegacyDataCommitmentError(
+      'commit does not match the application binding',
+    );
+  }
+  return commit;
+}
diff --git a/packages/ql3-local-application/src/production-process/processApplication.ts b/packages/ql3-local-application/src/production-process/processApplication.ts
index 97a2ba33..f433bf9c 100644
--- a/packages/ql3-local-application/src/production-process/processApplication.ts
+++ b/packages/ql3-local-application/src/production-process/processApplication.ts
@@ -19,6 +19,7 @@ import {
   type LocalApplicationProcessConfig,
 } from './processConfig';
 import { verifyLocalApplicationCutoverCommitment } from './cutoverCommitment';
+import { verifyLocalApplicationLegacyDataCommitment } from './legacyDataApplicationCommitment';
 import { recordLocalApplicationShutdownReceipt } from './shutdownReceipt';
 import { recordLocalApplicationStartupReceipt } from './startupReceipt';
 
@@ -221,6 +222,7 @@ export async function runProductionLocalApplicationProcess(
     throw new TypeError('Local application process options are invalid');
   }
   const config = loadLocalApplicationProcessConfig(options.configFilePath);
+  verifyLocalApplicationLegacyDataCommitment(config);
   verifyLocalApplicationCutoverCommitment(config);
   const selectedAi = aiOptions(config, options);
   const start = options.start ?? defaultStarter;
diff --git a/packages/ql3-local-application/src/production-process/processConfig.ts b/packages/ql3-local-application/src/production-process/processConfig.ts
index 3819b8d5..d992fc26 100644
--- a/packages/ql3-local-application/src/production-process/processConfig.ts
+++ b/packages/ql3-local-application/src/production-process/processConfig.ts
@@ -2,9 +2,7 @@ import path from 'node:path';
 
 import { readPrivateLocalCommandFile } from '@qinglong/local-command-file';
 import { MAX_PLUGIN_PACKAGE_INSTALL_RECOVERY_PAGE_SIZE } from '@qinglong/runtime-core/plugin-package-install';
-import {
-  MAX_PLUGIN_PACKAGE_RECOVERY_PAGES,
-} from '@qinglong/runtime-core/plugin-package-recovery';
+import { MAX_PLUGIN_PACKAGE_RECOVERY_PAGES } from '@qinglong/runtime-core/plugin-package-recovery';
 import {
   MAX_PLUGIN_PACKAGE_TASK_PUBLICATION_RECOVERY_PAGES,
   MAX_PLUGIN_PACKAGE_TASK_PUBLICATION_RECOVERY_PAGE_SIZE,
@@ -18,6 +16,8 @@ export const LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V2 =
   'qinglong/local-application-process@v2' as const;
 export const LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V3 =
   'qinglong/local-application-process@v3' as const;
+export const LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V4 =
+  'qinglong/local-application-process@v4' as const;
 
 const MAX_PATH_BYTES = 4_096;
 const INSTANCE_ID_PATTERN = /^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$/;
@@ -56,6 +56,12 @@ export interface LocalApplicationProcessCutoverConfig {
   readonly expectedCommitmentDigest: string;
 }
 
+export interface LocalApplicationProcessLegacyDataApplicationConfig {
+  readonly commitPath: string;
+  readonly expectedCommitDigest: string;
+  readonly expectedReceiptDigest: string;
+}
+
 export type LocalApplicationProcessPluginPackageRecoverySourceConfig =
   | Readonly<{ mode: 'disabled' }>
   | Readonly<{
@@ -89,7 +95,8 @@ export interface LocalApplicationProcessConfig {
   readonly schema:
     | typeof LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA
     | typeof LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V2
-    | typeof LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V3;
+    | typeof LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V3
+    | typeof LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V4;
   readonly instanceId: string;
   readonly profile: LocalApplicationProfile;
   readonly storage: Readonly<LocalApplicationProcessStorageConfig>;
@@ -97,13 +104,17 @@ export interface LocalApplicationProcessConfig {
   readonly pluginPackages: Readonly<LocalApplicationProcessPluginPackageConfig>;
   readonly ai: LocalApplicationProcessAiConfig;
   readonly cutover?: Readonly<LocalApplicationProcessCutoverConfig>;
+  readonly legacyDataApplication?: Readonly<LocalApplicationProcessLegacyDataApplicationConfig>;
 }
 
 export class LocalApplicationProcessConfigError extends TypeError {
   readonly code = 'QL3_LOCAL_APPLICATION_PROCESS_CONFIG_INVALID';
 
   constructor(message: string, options?: ErrorOptions) {
-    super(`Local application process configuration is invalid: ${message}`, options);
+    super(
+      `Local application process configuration is invalid: ${message}`,
+      options,
+    );
     this.name = 'LocalApplicationProcessConfigError';
   }
 }
@@ -175,7 +186,8 @@ function storageConfig(
   schema:
     | typeof LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA
     | typeof LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V2
-    | typeof LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V3,
+    | typeof LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V3
+    | typeof LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V4,
 ): Readonly<LocalApplicationProcessStorageConfig> {
   const storage = record(value, 'storage');
   if (schema !== LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA) {
@@ -218,9 +230,7 @@ function storageConfig(
       'recoveryPath',
       'sourcePath',
       'targetPath',
-      ...(schema !== LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA
-        ? ['mode']
-        : []),
+      ...(schema !== LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA ? ['mode'] : []),
       ...optionalKeys,
     ],
     'storage',
@@ -297,6 +307,32 @@ function cutoverConfig(
   });
 }
 
+function legacyDataApplicationConfig(
+  value: unknown,
+): Readonly<LocalApplicationProcessLegacyDataApplicationConfig> {
+  const application = record(value, 'legacyDataApplication');
+  exactKeys(
+    application,
+    ['commitPath', 'expectedCommitDigest', 'expectedReceiptDigest'],
+    'legacyDataApplication',
+  );
+  if (
+    typeof application.expectedCommitDigest !== 'string' ||
+    !DIGEST_PATTERN.test(application.expectedCommitDigest) ||
+    typeof application.expectedReceiptDigest !== 'string' ||
+    !DIGEST_PATTERN.test(application.expectedReceiptDigest)
+  ) {
+    throw new LocalApplicationProcessConfigError(
+      'legacyDataApplication digest is invalid',
+    );
+  }
+  return Object.freeze({
+    commitPath: absolutePath(application.commitPath, 'commitPath'),
+    expectedCommitDigest: application.expectedCommitDigest,
+    expectedReceiptDigest: application.expectedReceiptDigest,
+  });
+}
+
 function runtimeConfig(
   value: unknown,
 ): Readonly<LocalApplicationProcessRuntimeConfig> {
@@ -498,7 +534,8 @@ export function normalizeLocalApplicationProcessConfig(
   if (
     config.schema !== LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA &&
     config.schema !== LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V2 &&
-    config.schema !== LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V3
+    config.schema !== LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V3 &&
+    config.schema !== LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V4
   ) {
     throw new LocalApplicationProcessConfigError('schema is invalid');
   }
@@ -506,10 +543,14 @@ export function normalizeLocalApplicationProcessConfig(
     config,
     [
       'ai',
-      ...(config.schema === LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V3
+      ...(config.schema === LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V3 ||
+      config.schema === LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V4
         ? ['cutover']
         : []),
       'instanceId',
+      ...(config.schema === LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V4
+        ? ['legacyDataApplication']
+        : []),
       'pluginPackages',
       'profile',
       'runtime',
@@ -528,7 +569,8 @@ export function normalizeLocalApplicationProcessConfig(
     throw new LocalApplicationProcessConfigError('profile is invalid');
   }
   if (
-    config.schema === LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V3 &&
+    (config.schema === LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V3 ||
+      config.schema === LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V4) &&
     record(config.storage, 'storage').mode !== 'adopted'
   ) {
     throw new LocalApplicationProcessConfigError(
@@ -543,9 +585,17 @@ export function normalizeLocalApplicationProcessConfig(
     runtime: runtimeConfig(config.runtime),
     pluginPackages: pluginPackageConfig(config.pluginPackages),
     ai: aiConfig(config.ai),
-    ...(config.schema === LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V3
+    ...(config.schema === LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V3 ||
+    config.schema === LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V4
       ? { cutover: cutoverConfig(config.cutover) }
       : {}),
+    ...(config.schema === LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V4
+      ? {
+          legacyDataApplication: legacyDataApplicationConfig(
+            config.legacyDataApplication,
+          ),
+        }
+      : {}),
   } as const;
   const authorityPaths = [
     ...(normalized.storage.mode === 'fresh'
@@ -565,8 +615,10 @@ export function normalizeLocalApplicationProcessConfig(
     ...(normalized.cutover === undefined
       ? []
       : [normalized.cutover.commitmentPath]),
-    ...(normalized.pluginPackages.recoverySource.mode ===
-    'materialized_catalog'
+    ...(normalized.legacyDataApplication === undefined
+      ? []
+      : [normalized.legacyDataApplication.commitPath]),
+    ...(normalized.pluginPackages.recoverySource.mode === 'materialized_catalog'
       ? [
           normalized.pluginPackages.recoverySource.catalogRoot,
           normalized.pluginPackages.recoverySource.bundleRoot,
diff --git a/packages/ql3-local-application/test/legacyDataApplicationCommitment.test.cjs b/packages/ql3-local-application/test/legacyDataApplicationCommitment.test.cjs
new file mode 100644
index 00000000..a85531ff
--- /dev/null
+++ b/packages/ql3-local-application/test/legacyDataApplicationCommitment.test.cjs
@@ -0,0 +1,204 @@
+const assert = require('node:assert/strict');
+const crypto = require('node:crypto');
+const fs = require('node:fs');
+const os = require('node:os');
+const path = require('node:path');
+const { test } = require('node:test');
+
+const {
+  createLocalDataDirectoryApplicationCommit,
+} = require('@qinglong/local-sqlite/data-directory-application-commit');
+const {
+  LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V3,
+  LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V4,
+  LocalApplicationProcessConfigError,
+  normalizeLocalApplicationProcessConfig,
+} = require('../dist/production-process/processConfig.js');
+const {
+  LocalApplicationLegacyDataCommitmentError,
+  verifyLocalApplicationLegacyDataCommitment,
+} = require('../dist/production-process/legacyDataApplicationCommitment.js');
+const {
+  runProductionLocalApplicationProcess,
+} = require('../dist/production-process/processApplication.js');
+
+function temporaryRoot(t) {
+  const root = fs.mkdtempSync(path.join(os.tmpdir(), 'ql3-data-commitment-'));
+  t.after(() => fs.rmSync(root, { recursive: true, force: true }));
+  return root;
+}
+
+function commitDocument(profile = 'edge') {
+  return createLocalDataDirectoryApplicationCommit({
+    mutationId: '00000000-0000-4000-8000-000000000001',
+    projectId: 'project-edge-1',
+    profile,
+    sourceStageManifestDigest: '1'.repeat(64),
+    transformationDigest: '2'.repeat(64),
+    modelDigest: '3'.repeat(64),
+    publicationDigest: '4'.repeat(64),
+    receiptDigest: '5'.repeat(64),
+    committedAtMs: 1_000,
+    receipt: {
+      secretCount: 2,
+      environmentSecretCount: 1,
+      sshSecretCount: 1,
+    },
+  });
+}
+
+function v4Config(root, commit) {
+  const cutoverPayload = {
+    schemaVersion: 1,
+    kind: 'qinglong3-local-legacy-silence-commitment',
+    state: 'legacy_stopped',
+    cutoverId: 'cutover-data-1',
+    profile: 'edge',
+    instanceId: 'edge-router-1',
+    activationDigest: 'a'.repeat(64),
+    previousRecordDigest: 'b'.repeat(64),
+    requestedAtMs: 1_000,
+    observedAtMs: 1_000,
+    controller: {
+      kind: 'docker',
+      endpointDigest: 'c'.repeat(64),
+      legacyContainerId: 'd'.repeat(64),
+      legacyContainerIdentityDigest: 'e'.repeat(64),
+      legacySourceBindingDigest: 'f'.repeat(64),
+    },
+  };
+  return {
+    schema: LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V4,
+    instanceId: 'edge-router-1',
+    profile: 'edge',
+    storage: {
+      mode: 'adopted',
+      sourcePath: path.join(root, 'legacy.sqlite'),
+      targetPath: path.join(root, 'qinglong3.sqlite'),
+      recoveryPath: path.join(root, 'recovery.sqlite'),
+      manifestPath: path.join(root, 'manifest.json'),
+      activationPath: path.join(root, 'activation.json'),
+      expectedActivationDigest: 'a'.repeat(64),
+      busyTimeoutMs: 100,
+    },
+    runtime: {
+      receiptRoot: path.join(root, 'receipts'),
+      artifactRoot: path.join(root, 'artifacts'),
+      secretKeyringPath: path.join(root, 'secret-keyring.json'),
+    },
+    pluginPackages: {
+      stagingRoot: path.join(root, 'plugin-staging'),
+      activationRoot: path.join(root, 'plugin-activation'),
+      recoverySource: { mode: 'disabled' },
+      pageSize: 4,
+      maxPages: 4,
+      taskPublicationPageSize: 4,
+      taskPublicationMaxPages: 4,
+    },
+    ai: { deployment: 'excluded' },
+    cutover: {
+      cutoverId: cutoverPayload.cutoverId,
+      commitmentPath: path.join(root, 'legacy-stopped.json'),
+      expectedCommitmentDigest: crypto
+        .createHash('sha256')
+        .update(JSON.stringify(cutoverPayload), 'utf8')
+        .digest('hex'),
+    },
+    legacyDataApplication: {
+      commitPath: path.join(root, 'commit.json'),
+      expectedCommitDigest: commit.commitDigest,
+      expectedReceiptDigest: commit.receiptDigest,
+    },
+  };
+}
+
+function writeCommit(config, commit) {
+  fs.writeFileSync(
+    config.legacyDataApplication.commitPath,
+    `${JSON.stringify(commit)}\n`,
+    { mode: 0o600 },
+  );
+}
+
+test('v4 config binds and verifies a canonical committed data application', (t) => {
+  const root = temporaryRoot(t);
+  const commit = commitDocument();
+  const config = v4Config(root, commit);
+  writeCommit(config, commit);
+  const normalized = normalizeLocalApplicationProcessConfig(config);
+  assert.equal(normalized.schema, LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V4);
+  assert.deepEqual(
+    verifyLocalApplicationLegacyDataCommitment(normalized),
+    commit,
+  );
+});
+
+test('v4 config rejects fresh storage and missing receipt binding', (t) => {
+  const root = temporaryRoot(t);
+  const commit = commitDocument();
+  const config = v4Config(root, commit);
+  assert.throws(
+    () =>
+      normalizeLocalApplicationProcessConfig({
+        ...config,
+        storage: {
+          mode: 'fresh',
+          databasePath: path.join(root, 'fresh.sqlite'),
+        },
+      }),
+    LocalApplicationProcessConfigError,
+  );
+  const { legacyDataApplication, ...missing } = config;
+  assert.ok(legacyDataApplication);
+  assert.throws(
+    () => normalizeLocalApplicationProcessConfig(missing),
+    LocalApplicationProcessConfigError,
+  );
+});
+
+test('commit and receipt drift fail before signal or storage authority', async (t) => {
+  const root = temporaryRoot(t);
+  const commit = commitDocument();
+  const config = v4Config(root, commit);
+  writeCommit(config, commit);
+  config.legacyDataApplication.expectedReceiptDigest = '0'.repeat(64);
+  const configPath = path.join(root, 'local-application.json');
+  fs.writeFileSync(configPath, `${JSON.stringify(config)}\n`, { mode: 0o600 });
+  let subscriptions = 0;
+  let starts = 0;
+  await assert.rejects(
+    () =>
+      runProductionLocalApplicationProcess({
+        configFilePath: configPath,
+        signals: {
+          subscribe() {
+            subscriptions += 1;
+            return () => undefined;
+          },
+        },
+        emit() {},
+        async start() {
+          starts += 1;
+          throw new Error('must not start');
+        },
+      }),
+    (error) =>
+      error instanceof LocalApplicationLegacyDataCommitmentError &&
+      error.code === 'QL3_LOCAL_APPLICATION_LEGACY_DATA_COMMITMENT_INVALID',
+  );
+  assert.equal(subscriptions, 0);
+  assert.equal(starts, 0);
+});
+
+test('v3 remains SQLite-only and does not claim a data application receipt', (t) => {
+  const root = temporaryRoot(t);
+  const commit = commitDocument();
+  const config = v4Config(root, commit);
+  const { legacyDataApplication, ...withoutDataApplication } = config;
+  assert.ok(legacyDataApplication);
+  const v3 = normalizeLocalApplicationProcessConfig({
+    ...withoutDataApplication,
+    schema: LOCAL_APPLICATION_PROCESS_CONFIG_SCHEMA_V3,
+  });
+  assert.equal(verifyLocalApplicationLegacyDataCommitment(v3), undefined);
+});
diff --git a/packages/ql3-local-owner-cli/src/lifecycle/data-directory-adoption/application/cleanup.ts b/packages/ql3-local-owner-cli/src/lifecycle/data-directory-adoption/application/cleanup.ts
index fccc4ba7..c39fd3ce 100644
--- a/packages/ql3-local-owner-cli/src/lifecycle/data-directory-adoption/application/cleanup.ts
+++ b/packages/ql3-local-owner-cli/src/lifecycle/data-directory-adoption/application/cleanup.ts
@@ -2,7 +2,9 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 import {
+  createLocalDataDirectoryApplicationCommit,
   createLocalDataDirectorySourceNameDigest,
+  type LocalDataDirectoryApplicationCommit,
   type LocalDataDirectoryAdoptionRecord,
 } from '@qinglong/local-sqlite/data-directory-adoption';
 
@@ -13,7 +15,6 @@ import {
   sortedNames,
   syncDirectory,
 } from '../filesystem';
-import { sha256Text } from '../manifest';
 import {
   readStablePrivateUtf8File,
   writePrivateJson,
@@ -29,34 +30,6 @@ const MODEL_NAME = 'model';
 const MAX_JSON_BYTES = 1024 * 1024;
 const ZERO_CHUNK = Buffer.alloc(64 * 1024);
 
-interface LocalDataDirectoryApplicationCommitPayload {
-  readonly schemaVersion: 1;
-  readonly kind: 'qinglong3-legacy-data-directory-application';
-  readonly state: 'committed';
-  readonly mutationId: string;
-  readonly profile: 'edge' | 'standalone';
-  readonly projectIdDigest: string;
-  readonly sourceStageManifestDigest: string;
-  readonly transformationDigest: string;
-  readonly modelDigest: string;
-  readonly publicationDigest: string;
-  readonly receiptDigest: string;
-  readonly secretCount: number;
-  readonly environmentSecretCount: number;
-  readonly sshSecretCount: number;
-  readonly committedAtMs: number;
-  readonly reclamation: Readonly<{
-    modelRemoved: true;
-    plaintextFilesRemoved: true;
-    physicalErasureGuaranteed: false;
-  }>;
-}
-
-export interface LocalDataDirectoryApplicationCommit
-  extends LocalDataDirectoryApplicationCommitPayload {
-  readonly commitDigest: string;
-}
-
 function exactKeys(value: object, expected: readonly string[]): boolean {
   const actual = Object.keys(value).sort();
   const canonical = [...expected].sort();
@@ -66,37 +39,6 @@ function exactKeys(value: object, expected: readonly string[]): boolean {
   );
 }
 
-function expectedCommit(
-  adoption: Readonly<LocalDataDirectoryAdoptionRecord>,
-): Readonly<LocalDataDirectoryApplicationCommit> {
-  const payload: LocalDataDirectoryApplicationCommitPayload = {
-    schemaVersion: 1,
-    kind: 'qinglong3-legacy-data-directory-application',
-    state: 'committed',
-    mutationId: adoption.mutationId,
-    profile: adoption.profile,
-    projectIdDigest: sha256Text(adoption.projectId),
-    sourceStageManifestDigest: adoption.sourceStageManifestDigest,
-    transformationDigest: adoption.transformationDigest,
-    modelDigest: adoption.modelDigest,
-    publicationDigest: adoption.publicationDigest,
-    receiptDigest: adoption.receiptDigest,
-    secretCount: adoption.receipt.secretCount,
-    environmentSecretCount: adoption.receipt.environmentSecretCount,
-    sshSecretCount: adoption.receipt.sshSecretCount,
-    committedAtMs: adoption.committedAtMs,
-    reclamation: Object.freeze({
-      modelRemoved: true,
-      plaintextFilesRemoved: true,
-      physicalErasureGuaranteed: false,
-    }),
-  };
-  return Object.freeze({
-    ...payload,
-    commitDigest: sha256Text(JSON.stringify(payload)),
-  });
-}
-
 function readJson(filePath: string, uid: number, label: string): unknown {
   try {
     return JSON.parse(
@@ -167,7 +109,7 @@ function verifyCommit(
     authority.uid,
     'application commit',
   );
-  const expected = expectedCommit(adoption);
+  const expected = createLocalDataDirectoryApplicationCommit(adoption);
   if (!sameJson(actual, expected)) {
     throw new LocalDataDirectoryAdoptionConfigurationError(
       'application commit does not match the durable database receipt',
@@ -415,7 +357,10 @@ export function reclaimCommittedTransformationModel(options: {
 
   const commitPath = path.join(root, APPLICATION_COMMIT_NAME);
   if (!fs.existsSync(commitPath)) {
-    writePrivateJson(commitPath, expectedCommit(adoption));
+    writePrivateJson(
+      commitPath,
+      createLocalDataDirectoryApplicationCommit(adoption),
+    );
     syncDirectory(root);
   }
   const commit = verifyCommit(authority, adoption);
diff --git a/packages/ql3-local-sqlite/package.json b/packages/ql3-local-sqlite/package.json
index 8e32d133..fc4680bf 100644
--- a/packages/ql3-local-sqlite/package.json
+++ b/packages/ql3-local-sqlite/package.json
@@ -80,6 +80,11 @@
       "require": "./dist/adoption/data-directory/dataDirectoryAdoptionDatabase.js",
       "default": "./dist/adoption/data-directory/dataDirectoryAdoptionDatabase.js"
     },
+    "./data-directory-application-commit": {
+      "types": "./dist/adoption/data-directory/applicationCommit.d.ts",
+      "require": "./dist/adoption/data-directory/applicationCommit.js",
+      "default": "./dist/adoption/data-directory/applicationCommit.js"
+    },
     "./plugin-package-install": {
       "types": "./dist/plugin-package/pluginPackageInstallRepository.d.ts",
       "require": "./dist/plugin-package/pluginPackageInstallRepository.js",
diff --git a/packages/ql3-local-sqlite/src/adoption/data-directory/applicationCommit.ts b/packages/ql3-local-sqlite/src/adoption/data-directory/applicationCommit.ts
new file mode 100644
index 00000000..0fae810a
--- /dev/null
+++ b/packages/ql3-local-sqlite/src/adoption/data-directory/applicationCommit.ts
@@ -0,0 +1,230 @@
+import { createHash } from 'node:crypto';
+
+import type { LocalDataDirectoryAdoptionRecord } from './dataDirectoryAdoptionDatabase';
+
+const DIGEST_PATTERN = /^[0-9a-f]{64}$/;
+const UUID_V4_PATTERN =
+  /^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/;
+
+export const LOCAL_DATA_DIRECTORY_APPLICATION_COMMIT_KIND =
+  'qinglong3-legacy-data-directory-application' as const;
+
+export interface LocalDataDirectoryApplicationCommitPayload {
+  readonly schemaVersion: 1;
+  readonly kind: typeof LOCAL_DATA_DIRECTORY_APPLICATION_COMMIT_KIND;
+  readonly state: 'committed';
+  readonly mutationId: string;
+  readonly profile: 'edge' | 'standalone';
+  readonly projectIdDigest: string;
+  readonly sourceStageManifestDigest: string;
+  readonly transformationDigest: string;
+  readonly modelDigest: string;
+  readonly publicationDigest: string;
+  readonly receiptDigest: string;
+  readonly secretCount: number;
+  readonly environmentSecretCount: number;
+  readonly sshSecretCount: number;
+  readonly committedAtMs: number;
+  readonly reclamation: Readonly<{
+    modelRemoved: true;
+    plaintextFilesRemoved: true;
+    physicalErasureGuaranteed: false;
+  }>;
+}
+
+export interface LocalDataDirectoryApplicationCommit
+  extends LocalDataDirectoryApplicationCommitPayload {
+  readonly commitDigest: string;
+}
+
+export class LocalDataDirectoryApplicationCommitError extends TypeError {
+  readonly code = 'LOCAL_DATA_DIRECTORY_APPLICATION_COMMIT_INVALID';
+
+  constructor(message: string) {
+    super(`Local data directory application commit is invalid: ${message}`);
+    this.name = 'LocalDataDirectoryApplicationCommitError';
+  }
+}
+
+function digest(value: string): string {
+  return createHash('sha256').update(value, 'utf8').digest('hex');
+}
+
+function record(value: unknown, label: string): Record<string, unknown> {
+  if (
+    !value ||
+    typeof value !== 'object' ||
+    Array.isArray(value) ||
+    (Object.getPrototypeOf(value) !== Object.prototype &&
+      Object.getPrototypeOf(value) !== null)
+  ) {
+    throw new LocalDataDirectoryApplicationCommitError(
+      `${label} must be an object`,
+    );
+  }
+  return value as Record<string, unknown>;
+}
+
+function exact(
+  value: Record<string, unknown>,
+  keys: readonly string[],
+  label: string,
+): void {
+  const actual = Object.keys(value).sort();
+  const expected = [...keys].sort();
+  if (
+    actual.length !== expected.length ||
+    actual.some((key, index) => key !== expected[index])
+  ) {
+    throw new LocalDataDirectoryApplicationCommitError(
+      `${label} shape is invalid`,
+    );
+  }
+}
+
+function count(value: unknown, label: string): number {
+  if (!Number.isSafeInteger(value) || (value as number) < 0) {
+    throw new LocalDataDirectoryApplicationCommitError(`${label} is invalid`);
+  }
+  return value as number;
+}
+
+export function localDataDirectoryApplicationCommitDigest(
+  payload: Readonly<LocalDataDirectoryApplicationCommitPayload>,
+): string {
+  return digest(JSON.stringify(payload));
+}
+
+export function normalizeLocalDataDirectoryApplicationCommit(
+  value: unknown,
+): Readonly<LocalDataDirectoryApplicationCommit> {
+  const commit = record(value, 'commit');
+  exact(
+    commit,
+    [
+      'commitDigest',
+      'committedAtMs',
+      'environmentSecretCount',
+      'kind',
+      'modelDigest',
+      'mutationId',
+      'profile',
+      'projectIdDigest',
+      'publicationDigest',
+      'receiptDigest',
+      'reclamation',
+      'schemaVersion',
+      'secretCount',
+      'sourceStageManifestDigest',
+      'sshSecretCount',
+      'state',
+      'transformationDigest',
+    ],
+    'commit',
+  );
+  const reclamation = record(commit.reclamation, 'reclamation');
+  exact(
+    reclamation,
+    ['modelRemoved', 'physicalErasureGuaranteed', 'plaintextFilesRemoved'],
+    'reclamation',
+  );
+  const secretCount = count(commit.secretCount, 'secretCount');
+  const environmentSecretCount = count(
+    commit.environmentSecretCount,
+    'environmentSecretCount',
+  );
+  const sshSecretCount = count(commit.sshSecretCount, 'sshSecretCount');
+  const digestValues = [
+    commit.projectIdDigest,
+    commit.sourceStageManifestDigest,
+    commit.transformationDigest,
+    commit.modelDigest,
+    commit.publicationDigest,
+    commit.receiptDigest,
+  ];
+  if (
+    commit.schemaVersion !== 1 ||
+    commit.kind !== LOCAL_DATA_DIRECTORY_APPLICATION_COMMIT_KIND ||
+    commit.state !== 'committed' ||
+    typeof commit.mutationId !== 'string' ||
+    !UUID_V4_PATTERN.test(commit.mutationId) ||
+    (commit.profile !== 'edge' && commit.profile !== 'standalone') ||
+    digestValues.some(
+      (candidate) =>
+        typeof candidate !== 'string' || !DIGEST_PATTERN.test(candidate),
+    ) ||
+    secretCount !== environmentSecretCount + sshSecretCount ||
+    !Number.isSafeInteger(commit.committedAtMs) ||
+    (commit.committedAtMs as number) < 0 ||
+    reclamation.modelRemoved !== true ||
+    reclamation.plaintextFilesRemoved !== true ||
+    reclamation.physicalErasureGuaranteed !== false
+  ) {
+    throw new LocalDataDirectoryApplicationCommitError(
+      'commit values are invalid',
+    );
+  }
+  const payload: LocalDataDirectoryApplicationCommitPayload = {
+    schemaVersion: 1,
+    kind: LOCAL_DATA_DIRECTORY_APPLICATION_COMMIT_KIND,
+    state: 'committed',
+    mutationId: commit.mutationId,
+    profile: commit.profile,
+    projectIdDigest: commit.projectIdDigest as string,
+    sourceStageManifestDigest: commit.sourceStageManifestDigest as string,
+    transformationDigest: commit.transformationDigest as string,
+    modelDigest: commit.modelDigest as string,
+    publicationDigest: commit.publicationDigest as string,
+    receiptDigest: commit.receiptDigest as string,
+    secretCount,
+    environmentSecretCount,
+    sshSecretCount,
+    committedAtMs: commit.committedAtMs as number,
+    reclamation: Object.freeze({
+      modelRemoved: true,
+      plaintextFilesRemoved: true,
+      physicalErasureGuaranteed: false,
+    }),
+  };
+  if (
+    typeof commit.commitDigest !== 'string' ||
+    !DIGEST_PATTERN.test(commit.commitDigest) ||
+    localDataDirectoryApplicationCommitDigest(payload) !== commit.commitDigest
+  ) {
+    throw new LocalDataDirectoryApplicationCommitError(
+      'commit digest is invalid',
+    );
+  }
+  return Object.freeze({ ...payload, commitDigest: commit.commitDigest });
+}
+
+export function createLocalDataDirectoryApplicationCommit(
+  adoption: Readonly<LocalDataDirectoryAdoptionRecord>,
+): Readonly<LocalDataDirectoryApplicationCommit> {
+  const payload: LocalDataDirectoryApplicationCommitPayload = {
+    schemaVersion: 1,
+    kind: LOCAL_DATA_DIRECTORY_APPLICATION_COMMIT_KIND,
+    state: 'committed',
+    mutationId: adoption.mutationId,
+    profile: adoption.profile,
+    projectIdDigest: digest(adoption.projectId),
+    sourceStageManifestDigest: adoption.sourceStageManifestDigest,
+    transformationDigest: adoption.transformationDigest,
+    modelDigest: adoption.modelDigest,
+    publicationDigest: adoption.publicationDigest,
+    receiptDigest: adoption.receiptDigest,
+    secretCount: adoption.receipt.secretCount,
+    environmentSecretCount: adoption.receipt.environmentSecretCount,
+    sshSecretCount: adoption.receipt.sshSecretCount,
+    committedAtMs: adoption.committedAtMs,
+    reclamation: Object.freeze({
+      modelRemoved: true,
+      plaintextFilesRemoved: true,
+      physicalErasureGuaranteed: false,
+    }),
+  };
+  return Object.freeze({
+    ...payload,
+    commitDigest: localDataDirectoryApplicationCommitDigest(payload),
+  });
+}
diff --git a/packages/ql3-local-sqlite/src/adoption/data-directory/dataDirectoryAdoptionDatabase.ts b/packages/ql3-local-sqlite/src/adoption/data-directory/dataDirectoryAdoptionDatabase.ts
index 002778ac..684fbb81 100644
--- a/packages/ql3-local-sqlite/src/adoption/data-directory/dataDirectoryAdoptionDatabase.ts
+++ b/packages/ql3-local-sqlite/src/adoption/data-directory/dataDirectoryAdoptionDatabase.ts
@@ -34,6 +34,8 @@ import {
   type LocalSqliteProfile,
 } from '../../storage/config';
 
+export * from './applicationCommit';
+
 const DIGEST_PATTERN = /^[0-9a-f]{64}$/;
 const UUID_V4_PATTERN =
   /^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/;
diff --git a/packages/ql3-local-sqlite/test/dataDirectoryApplicationCommit.test.cjs b/packages/ql3-local-sqlite/test/dataDirectoryApplicationCommit.test.cjs
new file mode 100644
index 00000000..08bf3e88
--- /dev/null
+++ b/packages/ql3-local-sqlite/test/dataDirectoryApplicationCommit.test.cjs
@@ -0,0 +1,60 @@
+const assert = require('node:assert/strict');
+const { test } = require('node:test');
+
+const {
+  LocalDataDirectoryApplicationCommitError,
+  createLocalDataDirectoryApplicationCommit,
+  normalizeLocalDataDirectoryApplicationCommit,
+} = require('../dist/adoption/data-directory/dataDirectoryAdoptionDatabase.js');
+
+function adoptionRecord() {
+  return {
+    mutationId: '00000000-0000-4000-8000-000000000001',
+    projectId: 'project-edge-1',
+    profile: 'edge',
+    sourceStageManifestDigest: '1'.repeat(64),
+    transformationDigest: '2'.repeat(64),
+    modelDigest: '3'.repeat(64),
+    publicationDigest: '4'.repeat(64),
+    receiptDigest: '5'.repeat(64),
+    committedAtMs: 1_000,
+    receipt: {
+      secretCount: 3,
+      environmentSecretCount: 2,
+      sshSecretCount: 1,
+    },
+  };
+}
+
+test('canonical data application commit is exact and replayable', () => {
+  const commit = createLocalDataDirectoryApplicationCommit(adoptionRecord());
+  assert.equal(commit.kind, 'qinglong3-legacy-data-directory-application');
+  assert.equal(commit.state, 'committed');
+  assert.equal(commit.profile, 'edge');
+  assert.equal(commit.receiptDigest, '5'.repeat(64));
+  assert.equal(commit.commitDigest.length, 64);
+  assert.deepEqual(
+    normalizeLocalDataDirectoryApplicationCommit(
+      JSON.parse(JSON.stringify(commit)),
+    ),
+    commit,
+  );
+});
+
+test('data application commit rejects shape, count, and digest drift', () => {
+  const commit = createLocalDataDirectoryApplicationCommit(adoptionRecord());
+  for (const drift of [
+    { ...commit, unexpected: true },
+    { ...commit, secretCount: 4 },
+    { ...commit, receiptDigest: '0'.repeat(64) },
+    {
+      ...commit,
+      reclamation: { ...commit.reclamation, physicalErasureGuaranteed: true },
+    },
+  ]) {
+    assert.throws(
+      () => normalizeLocalDataDirectoryApplicationCommit(drift),
+      LocalDataDirectoryApplicationCommitError,
+    );
+  }
+});
diff --git a/scripts/ql3-cluster-dependency-audit.cjs b/scripts/ql3-cluster-dependency-audit.cjs
index 2e6b7d04..801c42bb 100644
--- a/scripts/ql3-cluster-dependency-audit.cjs
+++ b/scripts/ql3-cluster-dependency-audit.cjs
@@ -2649,6 +2649,14 @@ function auditSourceImports(root, packagePath, findings) {
       ) {
         continue;
       }
+      if (
+        packagePath === 'packages/ql3-local-application' &&
+        path.relative(packageDirectory, filePath) ===
+          'src/production-process/legacyDataApplicationCommitment.ts' &&
+        specifier === '@qinglong/local-sqlite/data-directory-application-commit'
+      ) {
+        continue;
+      }
       if (
         packagePath === 'packages/ql3-local-owner-cli' &&
         path.relative(packageDirectory, filePath) ===
diff --git a/test/back/ql3ClusterDependencyAudit.test.cjs b/test/back/ql3ClusterDependencyAudit.test.cjs
index f2df099c..a031c5b0 100644
--- a/test/back/ql3ClusterDependencyAudit.test.cjs
+++ b/test/back/ql3ClusterDependencyAudit.test.cjs
@@ -2477,6 +2477,47 @@ test('local application imports only reviewed execution subpaths and process bou
   );
 });
 
+test('local application receives only the pure data application commit codec', (t) => {
+  const root = fs.mkdtempSync(
+    path.join(os.tmpdir(), 'ql3-local-data-commit-codec-boundary-'),
+  );
+  const sourceDirectory = path.join(
+    root,
+    'packages/ql3-local-application/src/production-process',
+  );
+  fs.mkdirSync(sourceDirectory, { recursive: true });
+  fs.writeFileSync(
+    path.join(sourceDirectory, 'legacyDataApplicationCommitment.ts'),
+    [
+      "import { normalize } from '@qinglong/local-sqlite/data-directory-application-commit';",
+      "import { mutate } from '@qinglong/local-sqlite/data-directory-adoption';",
+    ].join('\n'),
+  );
+  fs.writeFileSync(
+    path.join(sourceDirectory, 'neighbor.ts'),
+    "import { normalize } from '@qinglong/local-sqlite/data-directory-application-commit';",
+  );
+  t.after(() => fs.rmSync(root, { recursive: true, force: true }));
+
+  const findings = [];
+  auditSourceImports(root, 'packages/ql3-local-application', findings);
+  assert.deepEqual(
+    findings.map(({ code, file, specifier }) => ({ code, file, specifier })),
+    [
+      {
+        code: 'FORBIDDEN_PACKAGE_SOURCE_IMPORT',
+        file: 'packages/ql3-local-application/src/production-process/legacyDataApplicationCommitment.ts',
+        specifier: '@qinglong/local-sqlite/data-directory-adoption',
+      },
+      {
+        code: 'FORBIDDEN_PACKAGE_SOURCE_IMPORT',
+        file: 'packages/ql3-local-application/src/production-process/neighbor.ts',
+        specifier: '@qinglong/local-sqlite/data-directory-application-commit',
+      },
+    ],
+  );
+});
+
 test('local AI application imports only the reviewed dynamic composition subpaths', (t) => {
   const root = fs.mkdtempSync(
     path.join(os.tmpdir(), 'ql3-local-ai-application-boundary-'),
diff --git a/test/back/ql3PackageBoundaryAudit.test.cjs b/test/back/ql3PackageBoundaryAudit.test.cjs
index 5021f9d8..6d059c6c 100644
--- a/test/back/ql3PackageBoundaryAudit.test.cjs
+++ b/test/back/ql3PackageBoundaryAudit.test.cjs
@@ -540,10 +540,10 @@ test('current QL3 workspace has exactly eighteen reviewed package boundaries', (
       rootSourceFileRoles: localSqlite.rootSourceFileRoles,
     },
     {
-      sourceFiles: 201,
+      sourceFiles: 202,
       rootSourceFiles: 1,
       rootSourceLines: 31,
-      nestedSourceFiles: 200,
+      nestedSourceFiles: 201,
       rootSourceFileRoles: { 'index.ts': 'public_export' },
     },
   );