diff --git a/public/locales/de-DE/translation.json b/public/locales/de-DE/translation.json
index 5f7d6a9..20de05e 100644
--- a/public/locales/de-DE/translation.json
+++ b/public/locales/de-DE/translation.json
@@ -273,6 +273,8 @@
     "definition-id": "Definitions-ID",
     "definition-details": "Definitionsdetails",
     "tenant-id": "Mandanten-ID",
+    "history-ttl": "Verlaufs-Aufbewahrungsdauer",
+    "history-ttl-updated": "Verlaufs-Aufbewahrungsdauer aktualisiert.",
     "click-to-copy": "Klicken zum Kopieren",
     "history-mode-active": "Verlaufsmodus aktiv",
     "enable-history-mode": "Verlaufsmodus aktivieren",
diff --git a/public/locales/en-US/translation.json b/public/locales/en-US/translation.json
index ac20fbe..d9f36e4 100644
--- a/public/locales/en-US/translation.json
+++ b/public/locales/en-US/translation.json
@@ -273,6 +273,8 @@
     "definition-id": "Definition ID",
     "definition-details": "Definition details",
     "tenant-id": "Tenant ID",
+    "history-ttl": "History Time To Live",
+    "history-ttl-updated": "History time to live updated.",
     "click-to-copy": "Click to copy",
     "history-mode-active": "History Mode Active",
     "enable-history-mode": "Enable History Mode",
diff --git a/public/locales/es-ES/translation.json b/public/locales/es-ES/translation.json
index 121792c..43f3584 100644
--- a/public/locales/es-ES/translation.json
+++ b/public/locales/es-ES/translation.json
@@ -265,6 +265,8 @@
     "change-definition": "Cambiar definición",
     "definition-id": "ID de definición",
     "tenant-id": "ID del inquilino",
+    "history-ttl": "Tiempo de vida del historial",
+    "history-ttl-updated": "Tiempo de vida del historial actualizado.",
     "click-to-copy": "Clic para copiar",
     "history-mode-active": "Modo historial activo",
     "enable-history-mode": "Activar modo historial",
diff --git a/public/locales/fr-FR/translation.json b/public/locales/fr-FR/translation.json
index 43e715f..24946b4 100644
--- a/public/locales/fr-FR/translation.json
+++ b/public/locales/fr-FR/translation.json
@@ -265,6 +265,8 @@
     "change-definition": "Changer de définition",
     "definition-id": "ID de définition",
     "tenant-id": "ID du locataire",
+    "history-ttl": "Durée de conservation de l'historique",
+    "history-ttl-updated": "Durée de conservation de l'historique mise à jour.",
     "click-to-copy": "Cliquer pour copier",
     "history-mode-active": "Mode historique actif",
     "enable-history-mode": "Activer le mode historique",
diff --git a/public/locales/nl-NL/translation.json b/public/locales/nl-NL/translation.json
index a27f3a1..23b616d 100644
--- a/public/locales/nl-NL/translation.json
+++ b/public/locales/nl-NL/translation.json
@@ -265,6 +265,8 @@
     "change-definition": "Definitie wijzigen",
     "definition-id": "Definitie-ID",
     "tenant-id": "Tenant-ID",
+    "history-ttl": "Bewaartermijn geschiedenis",
+    "history-ttl-updated": "Bewaartermijn geschiedenis bijgewerkt.",
     "click-to-copy": "Klik om te kopiëren",
     "history-mode-active": "Geschiedenismodus actief",
     "enable-history-mode": "Geschiedenismodus inschakelen",
diff --git a/src/api/resources/process_definition.js b/src/api/resources/process_definition.js
index 0ec18ac..b890a9c 100644
--- a/src/api/resources/process_definition.js
+++ b/src/api/resources/process_definition.js
@@ -106,6 +106,14 @@ const activate_process_definition = (state, id) =>
     state.api.process.definition.suspend,
   )
 
+const update_history_ttl = (state, id, historyTimeToLive) =>
+  PUT(
+    `/process-definition/${id}/history-time-to-live`,
+    { historyTimeToLive },
+    state,
+    state.api.process.definition.update_history_ttl,
+  )
+
 const delete_process_definition = (state, id) =>
   DELETE(
     `/process-definition/${id}?cascade=true`,
@@ -129,6 +137,7 @@ const process_definition = {
   activity_instance_statistics: get_activity_instance_statistics,
   suspend: suspend_process_definition,
   activate: activate_process_definition,
+  update_history_ttl,
   remove: delete_process_definition,
 }
 
diff --git a/src/api/resources/process_definition.test.js b/src/api/resources/process_definition.test.js
index fec6547..31292e6 100644
--- a/src/api/resources/process_definition.test.js
+++ b/src/api/resources/process_definition.test.js
@@ -175,6 +175,16 @@ describe("api/resources/process_definition", () => {
     });
   });
 
+  it("update_history_ttl() PUTs the history time to live", () => {
+    process_definition.update_history_ttl(state, "def-1", 30);
+    expect_api_call(PUT, {
+      url: "/process-definition/def-1/history-time-to-live",
+      body: { historyTimeToLive: 30 },
+      state,
+      signal: state.api.process.definition.update_history_ttl,
+    });
+  });
+
   it("remove() DELETEs with cascade=true", () => {
     process_definition.remove(state, "def-1");
     expect_api_call(DELETE, {
diff --git a/src/pages/Processes.jsx b/src/pages/Processes.jsx
index d6ac79e..ae899cc 100644
--- a/src/pages/Processes.jsx
+++ b/src/pages/Processes.jsx
@@ -1,4 +1,4 @@
-import { useSignal } from "@preact/signals";
+import { useSignal, useSignalEffect } from "@preact/signals";
 import { useContext, useEffect } from "preact/hooks";
 import { useLocation, useRoute } from "preact-iso";
 import { useTranslation } from "react-i18next";
@@ -686,7 +686,7 @@ const DefinitionsEmpty = () => {
       <a
         href="https://docs.operaton.org/manual/latest/installation/full/tomcat/manual/"
         target="_blank"
-        rel="noopener"
+        rel="noreferrer"
       >
         {t("processes.empty.how-to")}
       </a>
@@ -716,14 +716,32 @@ const ProcessDefinitionDetails = () => {
 };
 
 const DefinitionOverview = () => {
-  const {
+  const state = useContext(AppState),
+    {
       api: {
         process: {
-          definition: { one: process_definition, statistics },
+          definition: { one: process_definition, statistics, update_history_ttl },
         },
       },
-    } = useContext(AppState),
-    [t] = useTranslation();
+    } = state,
+    [t] = useTranslation(),
+    history_ttl = useSignal("");
+
+  useSignalEffect(() => {
+    history_ttl.value =
+      process_definition.value?.data?.historyTimeToLive ?? "";
+  });
+
+  const submit_history_ttl = async (e, id) => {
+    e.preventDefault();
+    const raw = history_ttl.peek();
+    await engine_rest.process_definition.update_history_ttl(
+      state,
+      id,
+      raw === "" ? null : Number(raw),
+    );
+    void engine_rest.process_definition.one(state, id);
+  };
 
   /** @namespace process_definition.value.data.tenantId **/
   /** @namespace process_definition.value.data.deploymentId **/
@@ -771,6 +789,29 @@ const DefinitionOverview = () => {
               <dt>{t("processes.tabs.incidents")}</dt>
               <dd>{total_incidents}</dd>
             </dl>
+            <RequestState
+              signal={update_history_ttl}
+              on_nothing={() => <></>}
+              on_success={() => (
+                <p class="success">{t("processes.history-ttl-updated")}</p>
+              )}
+            />
+            <form
+              class="history-ttl-form"
+              onSubmit={(e) => submit_history_ttl(e, def.id)}
+            >
+              <label for="history-ttl">{t("processes.history-ttl")}</label>
+              <input
+                id="history-ttl"
+                name="historyTimeToLive"
+                type="number"
+                min="0"
+                step="1"
+                value={history_ttl.value}
+                onInput={(e) => (history_ttl.value = e.currentTarget.value)}
+              />
+              <button type="submit">{t("common.save")}</button>
+            </form>
           </div>
         );
       }}
@@ -928,8 +969,7 @@ const InstanceDetails = () => {
       params: { selection_id, definition_id, panel },
       query,
     } = useRoute(),
-    history_mode = query.history === "true",
-    [t] = useTranslation();
+    history_mode = query.history === "true";
 
   if (selection_id) {
     if (
@@ -1044,9 +1084,8 @@ const InstanceVariables = () => {
               ? Object.entries(
                   state.api.process.instance.variables.value.data,
                 ).map(
-                  // eslint-disable-next-line react/jsx-key
                   ([name, { type, value }]) => (
-                    <tr>
+                    <tr key={name}>
                       <td>{name}</td>
                       <td>{type}</td>
                       <td>{value}</td>
@@ -1054,9 +1093,8 @@ const InstanceVariables = () => {
                   ),
                 )
               : state.api.process.instance.variables.value.data.map(
-                  // eslint-disable-next-line react/jsx-key
                   ({ name, type, value }) => (
-                    <tr>
+                    <tr key={name}>
                       <td>{name}</td>
                       <td>{type}</td>
                       <td>{value}</td>
@@ -1464,13 +1502,6 @@ const JobDefinitions = () => {
   );
 };
 
-const BackToListBtn = ({ url, title, className }) => (
-  <a className={`tabs-back ${className || ""}`} href={url} title={title}>
-    <Icons.arrow_left />
-    <Icons.list />
-  </a>
-);
-
 const DefinitionsManage = () => {
   const state = useContext(AppState),
     { route } = useLocation(),
diff --git a/src/pages/Processes.test.jsx b/src/pages/Processes.test.jsx
index 60c4b48..ecec06d 100644
--- a/src/pages/Processes.test.jsx
+++ b/src/pages/Processes.test.jsx
@@ -245,6 +245,54 @@ describe("ProcessesPage — definition detail fetches", () => {
     // Heading shows the definition name.
     expect(getAllByText("Invoice").length).toBeGreaterThan(0);
   });
+
+  it("updates the process definition history time to live", async () => {
+    mockParams = { definition_id: "proc:1" };
+    signal_response(state.api.process.definition.one, {
+      id: "proc:1",
+      name: "Invoice",
+      key: "invoice",
+      version: 2,
+      historyTimeToLive: 30,
+    });
+    const { container, getByLabelText } = renderPage(state);
+
+    fireEvent.input(getByLabelText("processes.history-ttl"), {
+      target: { value: "45" },
+    });
+    fireEvent.submit(container.querySelector("form.history-ttl-form"));
+    await Promise.resolve();
+
+    expect(engine_rest.process_definition.update_history_ttl).toHaveBeenCalled();
+    const call = engine_rest.process_definition.update_history_ttl.mock.lastCall;
+    expect(call[0]).toBe(state);
+    expect(call[1]).toBe("proc:1");
+    expect(call[2]).toBe(45);
+  });
+
+  it("clears the process definition history time to live with an empty value", async () => {
+    mockParams = { definition_id: "proc:1" };
+    signal_response(state.api.process.definition.one, {
+      id: "proc:1",
+      name: "Invoice",
+      key: "invoice",
+      version: 2,
+      historyTimeToLive: 30,
+    });
+    const { container, getByLabelText } = renderPage(state);
+
+    fireEvent.input(getByLabelText("processes.history-ttl"), {
+      target: { value: "" },
+    });
+    fireEvent.submit(container.querySelector("form.history-ttl-form"));
+    await Promise.resolve();
+
+    expect(engine_rest.process_definition.update_history_ttl).toHaveBeenCalled();
+    const call = engine_rest.process_definition.update_history_ttl.mock.lastCall;
+    expect(call[0]).toBe(state);
+    expect(call[1]).toBe("proc:1");
+    expect(call[2]).toBeNull();
+  });
 });
 
 describe("ProcessesPage — definition tabs", () => {
diff --git a/src/state.js b/src/state.js
index f63ad2e..c5c54dc 100644
--- a/src/state.js
+++ b/src/state.js
@@ -110,6 +110,7 @@ const createAppState = () => {
         rendered_form: signal(null),
         activity_instance_statistics: signal(null),
         suspend: signal(null),
+        update_history_ttl: signal(null),
         remove: signal(null),
         saved_filters: signal(null),
       },