diff --git a/services/api/src/app.module.ts b/services/api/src/app.module.ts
index 3e3ba59c..c4a6ff9e 100644
--- a/services/api/src/app.module.ts
+++ b/services/api/src/app.module.ts
@@ -53,8 +53,11 @@ import {
   SessionRequestTenantContextAdapter,
   UnavailableWorkspaceAuthorizationEpochResolverAdapter,
 } from './platform/http/session-tenant-context.adapter.js';
+import { IamHierarchyDashboardProjectResolverAdapter } from './platform/http/iam-hierarchy-dashboard-project-resolver.adapter.js';
 import { PrismaSessionLifecycleAdapter } from './features/iam/adapter/prisma-session-lifecycle.adapter.js';
 import { PrismaIamRepositoryAdapter } from './features/iam/adapter/prisma-iam-repository.adapter.js';
+import { PrismaIamHierarchyRepositoryAdapter } from './features/iam/adapter/prisma-iam-hierarchy-repository.adapter.js';
+import type { IdentityBootstrapDatabaseClientV1 } from './features/iam/adapter/prisma-identity-bootstrap-repository.adapter.js';
 import { PrismaAgentGrantRepositoryAdapter } from './features/iam/adapter/prisma-agent-grant-repository.adapter.js';
 import { InMemoryAgentGrantRepositoryAdapter } from './features/iam/adapter/in-memory-agent-grant-repository.adapter.js';
 import { PrismaServiceAccountRepositoryAdapter } from './features/iam/adapter/prisma-service-account-repository.adapter.js';
@@ -206,6 +209,24 @@ export class AppModule {
       (options.iamDatabase === undefined
         ? undefined
         : new PrismaIamRepositoryAdapter(options.iamDatabase));
+    const hierarchyRepository =
+      options.hierarchyRepository ??
+      (options.hierarchyDatabase === undefined
+        ? undefined
+        : new PrismaIamHierarchyRepositoryAdapter(
+            options.hierarchyDatabase,
+            {},
+            options.identityBootstrapPolicyProvisionerFactory === undefined
+              ? undefined
+              : (transaction: unknown) =>
+                  options.identityBootstrapPolicyProvisionerFactory!(
+                    transaction as IdentityBootstrapDatabaseClientV1,
+                  ),
+          ));
+    const dashboardProjectResolver =
+      hierarchyRepository === undefined
+        ? undefined
+        : new IamHierarchyDashboardProjectResolverAdapter(hierarchyRepository);
     const iaeAuthorization =
       options.iaeAuthorization ??
       (iamRepository === undefined
@@ -293,9 +314,12 @@ export class AppModule {
                 : {}),
             },
             workspaceEpochResolver,
-            options.dashboardProjectId === undefined
-              ? {}
-              : { dashboardProjectId: options.dashboardProjectId },
+            {
+              ...(options.dashboardProjectId === undefined
+                ? {}
+                : { dashboardProjectId: options.dashboardProjectId }),
+              ...(dashboardProjectResolver === undefined ? {} : { dashboardProjectResolver }),
+            },
           )
         : undefined);
     const platformOperatorAuthority =
@@ -667,6 +691,7 @@ export class AppModule {
       ...(landingFeedbackIpAdmission === undefined ? {} : { landingFeedbackIpAdmission }),
       ...(landingFeedbackAdmissionDigest === undefined ? {} : { landingFeedbackAdmissionDigest }),
       ...(iamRepository === undefined ? {} : { iamRepository }),
+      ...(hierarchyRepository === undefined ? {} : { hierarchyRepository }),
       ...(iaeAuthorization === undefined ? {} : { iaeAuthorization }),
       ...(iaeOriginalViewPort === undefined ? {} : { iaeOriginalViewPort }),
       accessPresetService,
diff --git a/services/api/src/platform/http/dashboard-project-resolver.port.ts b/services/api/src/platform/http/dashboard-project-resolver.port.ts
new file mode 100644
index 00000000..73ef3928
--- /dev/null
+++ b/services/api/src/platform/http/dashboard-project-resolver.port.ts
@@ -0,0 +1,8 @@
+import type { StableIdentifierV1 } from '@databreeze/domain/tenant-scope/v1';
+
+import type { IamTenantContextV1 } from '../../features/iam/application/tenant-context.js';
+
+/** Resolve a server-owned dashboard project inside the authenticated tenant scope. */
+export interface DashboardProjectResolverPortV1 {
+  resolveDashboardProject(context: IamTenantContextV1): Promise<StableIdentifierV1 | undefined>;
+}
diff --git a/services/api/src/platform/http/iam-hierarchy-dashboard-project-resolver.adapter.ts b/services/api/src/platform/http/iam-hierarchy-dashboard-project-resolver.adapter.ts
new file mode 100644
index 00000000..80060eca
--- /dev/null
+++ b/services/api/src/platform/http/iam-hierarchy-dashboard-project-resolver.adapter.ts
@@ -0,0 +1,26 @@
+import type { IamHierarchyRepositoryPortV1 } from '../../features/iam/application/hierarchy-repository.port.js';
+import type { IamTenantContextV1 } from '../../features/iam/application/tenant-context.js';
+import type { DashboardProjectResolverPortV1 } from './dashboard-project-resolver.port.js';
+
+/**
+ * IAM-002 / DDA-013: project dashboard routes may use the only active project
+ * belonging to the authenticated workspace. Ambiguous or foreign rows fail closed.
+ */
+export class IamHierarchyDashboardProjectResolverAdapter implements DashboardProjectResolverPortV1 {
+  public constructor(private readonly hierarchy: IamHierarchyRepositoryPortV1) {}
+
+  public async resolveDashboardProject(context: IamTenantContextV1) {
+    if (context.tenantScope.scopeType !== 'workspace') return undefined;
+
+    const { organizationId, workspaceId } = context.tenantScope;
+    const projects = await this.hierarchy.listProjects(context, workspaceId);
+    const activeProjects = projects.filter(
+      (project) =>
+        project.status === 'ACTIVE' &&
+        project.organizationId === organizationId &&
+        project.workspaceId === workspaceId,
+    );
+
+    return activeProjects.length === 1 ? activeProjects[0]?.id : undefined;
+  }
+}
diff --git a/services/api/src/platform/http/session-tenant-context.adapter.ts b/services/api/src/platform/http/session-tenant-context.adapter.ts
index 5a845685..9edcef67 100644
--- a/services/api/src/platform/http/session-tenant-context.adapter.ts
+++ b/services/api/src/platform/http/session-tenant-context.adapter.ts
@@ -8,6 +8,7 @@ import {
   type RequestTenantContextPortV1,
 } from './request-tenant-context.port.js';
 import { getRequestContext } from './request-context.js';
+import type { DashboardProjectResolverPortV1 } from './dashboard-project-resolver.port.js';
 
 type HeaderValueV1 = string | readonly string[] | undefined;
 const SAFE_METHODS_V1 = new Set(['GET', 'HEAD', 'OPTIONS']);
@@ -96,6 +97,8 @@ export class SessionRequestTenantContextAdapter implements RequestTenantContextP
        * dashboard routes; ordinary workspace APIs keep their workspace scope.
        */
       readonly dashboardProjectId?: string;
+      /** Production projection resolved inside the authenticated workspace. */
+      readonly dashboardProjectResolver?: DashboardProjectResolverPortV1;
     } = {},
   ) {}
 
@@ -145,20 +148,33 @@ export class SessionRequestTenantContextAdapter implements RequestTenantContextP
     } catch {
       throw new RequestTenantContextProblemError('AUTHENTICATION_UNAVAILABLE');
     }
-    const projectId = this.options.dashboardProjectId;
     const requestUrl = typeof input.url === 'string' ? input.url : '';
-    const dashboardRequest =
-      /^\/(?:v1|v3)\/dda\/dashboards(?:\/|$)/u.test(requestUrl) && projectId !== undefined;
+    const dashboardRequest = /^\/(?:v1|v3)\/dda\/dashboards(?:\/|$)/u.test(requestUrl);
+    let projectId = this.options.dashboardProjectId;
+    if (
+      dashboardRequest &&
+      projectId === undefined &&
+      this.options.dashboardProjectResolver !== undefined
+    ) {
+      try {
+        projectId = await this.options.dashboardProjectResolver.resolveDashboardProject(
+          context.value,
+        );
+      } catch {
+        throw new RequestTenantContextProblemError('AUTHENTICATION_UNAVAILABLE');
+      }
+    }
     const resolved = createIamTenantContextV1({
       ...context.value,
-      tenantScope: dashboardRequest
-        ? {
-            scopeType: 'project',
-            organizationId: principal.organizationId,
-            workspaceId: principal.workspaceId,
-            projectId,
-          }
-        : context.value.tenantScope,
+      tenantScope:
+        dashboardRequest && projectId !== undefined
+          ? {
+              scopeType: 'project',
+              organizationId: principal.organizationId,
+              workspaceId: principal.workspaceId,
+              projectId,
+            }
+          : context.value.tenantScope,
       workspaceAuthorizationEpoch,
     });
     if (!resolved.accepted) throw new RequestTenantContextProblemError('CONTEXT_INVALID');
diff --git a/services/api/test/platform/http/iam-hierarchy-dashboard-project-resolver.test.ts b/services/api/test/platform/http/iam-hierarchy-dashboard-project-resolver.test.ts
new file mode 100644
index 00000000..5fbc93cb
--- /dev/null
+++ b/services/api/test/platform/http/iam-hierarchy-dashboard-project-resolver.test.ts
@@ -0,0 +1,83 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import { createProjectIdentityV1, type ProjectIdentityV1 } from '@databreeze/domain/identity/v1';
+
+import { IamHierarchyDashboardProjectResolverAdapter } from '../../../src/platform/http/iam-hierarchy-dashboard-project-resolver.adapter.js';
+import type { IamHierarchyRepositoryPortV1 } from '../../../src/features/iam/application/hierarchy-repository.port.js';
+import { createIamTenantContextV1 } from '../../../src/features/iam/application/tenant-context.js';
+
+const ids = {
+  actor: '00000000-0000-4000-8000-000000000101',
+  organization: '00000000-0000-4000-8000-000000000102',
+  workspace: '00000000-0000-4000-8000-000000000103',
+  project: '00000000-0000-4000-8000-000000000104',
+  archivedProject: '00000000-0000-4000-8000-000000000105',
+  secondProject: '00000000-0000-4000-8000-000000000106',
+  otherOrganization: '00000000-0000-4000-8000-000000000107',
+  otherWorkspace: '00000000-0000-4000-8000-000000000108',
+  correlation: '00000000-0000-4000-8000-000000000109',
+};
+
+const parsedContext = createIamTenantContextV1({
+  tenantScope: {
+    scopeType: 'workspace',
+    organizationId: ids.organization,
+    workspaceId: ids.workspace,
+  },
+  actorId: ids.actor,
+  correlationId: ids.correlation,
+  idempotencyKey: 'dashboard-project-resolution',
+  authorizationEpoch: 1,
+  workspaceAuthorizationEpoch: 1,
+});
+assert.equal(parsedContext.accepted, true);
+if (!parsedContext.accepted) throw new Error('invalid tenant context fixture');
+const context = parsedContext.value;
+
+function project(
+  id: string,
+  status: 'ACTIVE' | 'ARCHIVED',
+  organizationId = ids.organization,
+  workspaceId = ids.workspace,
+): ProjectIdentityV1 {
+  const parsed = createProjectIdentityV1({
+    id,
+    organizationId,
+    workspaceId,
+    kind: 'INTERNAL',
+    name: `Project ${id}`,
+    status,
+    createdAt: '2026-08-21T00:00:00.000Z',
+  });
+  assert.equal(parsed.accepted, true);
+  if (!parsed.accepted) throw new Error('invalid project fixture');
+  return parsed.value;
+}
+
+function repository(projects: readonly ProjectIdentityV1[]): IamHierarchyRepositoryPortV1 {
+  return {
+    listProjects: () => Promise.resolve(projects),
+  } as unknown as IamHierarchyRepositoryPortV1;
+}
+
+void test('[IAM-002, DDA-013] resolves the only active project in the exact authenticated workspace', async () => {
+  const resolver = new IamHierarchyDashboardProjectResolverAdapter(
+    repository([
+      project(ids.archivedProject, 'ARCHIVED'),
+      project(ids.project, 'ACTIVE'),
+      project(ids.secondProject, 'ACTIVE', ids.otherOrganization, ids.workspace),
+      project(ids.secondProject, 'ACTIVE', ids.organization, ids.otherWorkspace),
+    ]),
+  );
+
+  assert.equal(await resolver.resolveDashboardProject(context), ids.project);
+});
+
+void test('[IAM-002] refuses an ambiguous active-project scope instead of selecting arbitrarily', async () => {
+  const resolver = new IamHierarchyDashboardProjectResolverAdapter(
+    repository([project(ids.project, 'ACTIVE'), project(ids.secondProject, 'ACTIVE')]),
+  );
+
+  assert.equal(await resolver.resolveDashboardProject(context), undefined);
+});
diff --git a/services/api/test/platform/http/session-tenant-context.test.ts b/services/api/test/platform/http/session-tenant-context.test.ts
index b53b7a05..376a36a7 100644
--- a/services/api/test/platform/http/session-tenant-context.test.ts
+++ b/services/api/test/platform/http/session-tenant-context.test.ts
@@ -1,6 +1,8 @@
 import assert from 'node:assert/strict';
 import test from 'node:test';
 
+import { parseStableIdentifierV1 } from '@databreeze/domain/tenant-scope/v1';
+
 import { SessionRequestTenantContextAdapter } from '../../../src/platform/http/session-tenant-context.adapter.js';
 
 const principal = {
@@ -12,6 +14,10 @@ const principal = {
   mfaReenrollmentRequired: false,
 };
 const correlationId = '00000000-0000-4000-8000-000000000010';
+const parsedDashboardProjectId = parseStableIdentifierV1('00000000-0000-4000-8000-000000000004');
+assert.equal(parsedDashboardProjectId.accepted, true);
+if (!parsedDashboardProjectId.accepted) throw new Error('invalid dashboard project fixture');
+const dashboardProjectId = parsedDashboardProjectId.value;
 
 function workspaceEpoch(value = principal.securityEpoch) {
   return {
@@ -92,6 +98,73 @@ void test('derives the configured local project only for dashboard routes', asyn
   });
 });
 
+void test('[IAM-002, DDA-013] resolves the authenticated workspace project only for dashboard routes', async () => {
+  const resolvedScopes: unknown[] = [];
+  const adapter = new SessionRequestTenantContextAdapter(
+    { findPrincipalByAccessToken: () => Promise.resolve(principal) },
+    workspaceEpoch(),
+    {
+      dashboardProjectResolver: {
+        resolveDashboardProject: (context) => {
+          resolvedScopes.push(context.tenantScope);
+          return Promise.resolve(dashboardProjectId);
+        },
+      },
+    },
+  );
+
+  const dashboard = await adapter.resolve({
+    method: 'GET',
+    url: '/v3/dda/dashboards/workspace-history',
+    headers: { authorization: 'Bearer opaque-access-token-123456789' },
+  });
+  assert.deepEqual(dashboard.tenantScope, {
+    scopeType: 'project',
+    organizationId: principal.organizationId,
+    workspaceId: principal.workspaceId,
+    projectId: '00000000-0000-4000-8000-000000000004',
+  });
+  assert.deepEqual(resolvedScopes, [
+    {
+      scopeType: 'workspace',
+      organizationId: principal.organizationId,
+      workspaceId: principal.workspaceId,
+    },
+  ]);
+
+  const data = await adapter.resolve({
+    method: 'GET',
+    url: '/v1/datasets',
+    headers: { authorization: 'Bearer opaque-access-token-123456789' },
+  });
+  assert.equal(data.tenantScope.scopeType, 'workspace');
+  assert.equal(resolvedScopes.length, 1);
+});
+
+void test('[IAM-002] fails closed when dashboard project resolution is unavailable', async () => {
+  const adapter = new SessionRequestTenantContextAdapter(
+    { findPrincipalByAccessToken: () => Promise.resolve(principal) },
+    workspaceEpoch(),
+    {
+      dashboardProjectResolver: {
+        resolveDashboardProject: () => Promise.reject(new Error('database unavailable')),
+      },
+    },
+  );
+
+  await assert.rejects(
+    adapter.resolve({
+      method: 'GET',
+      url: '/v3/dda/dashboards/workspace-history',
+      headers: { authorization: 'Bearer opaque-access-token-123456789' },
+    }),
+    (error: unknown) => {
+      assert.equal((error as { code?: unknown }).code, 'AUTHENTICATION_UNAVAILABLE');
+      return true;
+    },
+  );
+});
+
 void test('rejects missing, ambiguous, malformed, and unknown bearer credentials', async () => {
   const adapter = new SessionRequestTenantContextAdapter(
     {
diff --git a/services/api/test/platform/iam-dataset-restriction-root-composition.test.ts b/services/api/test/platform/iam-dataset-restriction-root-composition.test.ts
index 3dfef6cb..b2024280 100644
--- a/services/api/test/platform/iam-dataset-restriction-root-composition.test.ts
+++ b/services/api/test/platform/iam-dataset-restriction-root-composition.test.ts
@@ -44,6 +44,7 @@ const ids = {
   foreignVersion: '00000000-0000-4000-8000-000000000b0a',
   retiredVersion: '00000000-0000-4000-8000-000000000b0b',
   correlation: '00000000-0000-4000-8000-000000000b0c',
+  project: '00000000-0000-4000-8000-000000000b0e',
 };
 
 function stable(value: string): StableIdentifierV1 {
@@ -264,6 +265,77 @@ void test('[IAM-024, DSM-018] production-shaped root selects durable IAM, DSM, a
   assert.ok(provider(iam, REQUEST_TENANT_CONTEXT) instanceof SessionRequestTenantContextAdapter);
 });
 
+void test('[IAM-002, DDA-013] production root resolves dashboard project from the exact hierarchy database scope', async () => {
+  const projectQueries: unknown[] = [];
+  const hierarchyDatabase = {
+    organizationIdentity: {},
+    workspaceIdentity: {},
+    projectIdentity: {
+      findMany: (input: unknown) => {
+        projectQueries.push(input);
+        return Promise.resolve([
+          {
+            id: ids.project,
+            organizationId: ids.organization,
+            workspaceId: ids.workspace,
+            kind: 'INTERNAL',
+            name: 'Personal project',
+            status: 'ACTIVE',
+            createdAt: new Date('2026-08-21T00:00:00.000Z'),
+          },
+        ]);
+      },
+    },
+    $transaction: () => Promise.reject(new Error('transaction not used by project resolution')),
+  };
+  const root = AppModule.register({
+    runtimeMode: 'production',
+    allowInMemoryAdapters: false,
+    sessions: {
+      findPrincipalByAccessToken: () =>
+        Promise.resolve({
+          userId: ids.owner,
+          organizationId: ids.organization,
+          workspaceId: ids.workspace,
+          securityEpoch: 7,
+          mfaRequired: false,
+          mfaReenrollmentRequired: false,
+        }),
+    } as never,
+    agentGrantRepository: new InMemoryAgentGrantRepositoryAdapter(),
+    hierarchyDatabase: hierarchyDatabase as never,
+    ddaDatabase: {} as never,
+    approvalDatabase: {} as never,
+  });
+  const iam = imported(root, IamModule);
+  const requestContext = provider(
+    iam,
+    REQUEST_TENANT_CONTEXT,
+  ) as SessionRequestTenantContextAdapter;
+
+  const resolved = await requestContext.resolve({
+    method: 'GET',
+    url: '/v3/dda/dashboards/workspace-history',
+    headers: { authorization: 'Bearer opaque-access-token-123456789' },
+  });
+
+  assert.deepEqual(resolved.tenantScope, {
+    scopeType: 'project',
+    organizationId: stable(ids.organization),
+    workspaceId: stable(ids.workspace),
+    projectId: stable(ids.project),
+  });
+  assert.deepEqual(projectQueries, [
+    {
+      where: {
+        organizationId: stable(ids.organization),
+        workspaceId: stable(ids.workspace),
+      },
+      orderBy: { id: 'asc' },
+    },
+  ]);
+});
+
 void test('[IAM-024] root session context is stale immediately after restriction mutation and re-resolves current epoch', async () => {
   const iamRepository = new InMemoryIamRepositoryAdapter();
   iamRepository.seed([