diff --git a/docs/settings-reference.md b/docs/settings-reference.md
index 08dcf82ad7..179225d0b2 100644
--- a/docs/settings-reference.md
+++ b/docs/settings-reference.md
@@ -430,7 +430,7 @@ Default notes:
 | `showQuickChatFAB` | `boolean` | `false` | Show floating quick-chat button (chat remains available via More menu). |
 | `chatAutoCleanupDays` | `0 \| 7 \| 14 \| 30 \| 60 \| 90` | `0` | Auto-cleanup retention window for idle chat sessions and chat rooms. `0` is off (default). When enabled, periodic self-healing maintenance deletes rows with `updatedAt` older than the configured day window. |
 | `mailAutoCleanupDays` | `0 \| 7 \| 14 \| 30 \| 60 \| 90` | `0` | Auto-prune retention window for inbox/outbox mail messages. `0` is off (default). When enabled, periodic self-healing maintenance deletes `messages` rows where `updatedAt < cutoff` for the configured day window. Suggested setting: `7`. |
-| `operationalLogRetentionDays` | `number` | `30` | Retention window for SQLite operational-log tables (`activityLog`, `runAuditEvents`, `agentHeartbeats`). Periodic maintenance prunes rows older than this many days using each row's `timestamp`. Set `0` to disable pruning. |
+| `operationalLogRetentionDays` | `0 \| 7 \| 14 \| 30 \| 60 \| 90` | `30` | Retention window for SQLite operational-log tables (`activityLog`, `runAuditEvents`, `agentHeartbeats`). `0` is off. Lower values mean Reliability metrics/charts and the Activity feed will not show history older than the configured window; per-task task detail history is unaffected. Periodic maintenance prunes rows older than this many days using each row's `timestamp`. |
 | `agentLogFileRetentionDays` | `number` | `0` | Retention window for per-task `.fusion/tasks/{ID}/agent-log.jsonl` files after a task is soft-deleted or archived. Periodic maintenance removes JSONL entries older than this many days; active tasks are never pruned. Set `0` to disable pruning. |
 | `chatRoomRecentVerbatimMessages` | `number` | `25` | Number of newest chat-room messages kept verbatim in responder context before older entries are compacted (about 2× prior default history). |
 | `chatRoomCompactionFetchLimit` | `number` | `200` | Upper bound on room messages fetched for transcript compaction per responder turn (raised to support larger retained context windows). |
diff --git a/packages/core/src/__tests__/settings-parity.test.ts b/packages/core/src/__tests__/settings-parity.test.ts
index 8c314969f8..a2e13b78b9 100644
--- a/packages/core/src/__tests__/settings-parity.test.ts
+++ b/packages/core/src/__tests__/settings-parity.test.ts
@@ -117,6 +117,13 @@ describe("settings key parity", () => {
     expect(PROJECT_SETTINGS_KEYS).toContain("mailAutoCleanupDays");
   });
 
+  it("defaults operationalLogRetentionDays to 30 and keeps it project-scoped", () => {
+    expect(DEFAULT_PROJECT_SETTINGS.operationalLogRetentionDays).toBe(30);
+    expect(isProjectSettingsKey("operationalLogRetentionDays")).toBe(true);
+    expect(isGlobalSettingsKey("operationalLogRetentionDays")).toBe(false);
+    expect(PROJECT_SETTINGS_KEYS).toContain("operationalLogRetentionDays");
+  });
+
   it("keeps heartbeatScopeDiscipline project-scoped with strict default", () => {
     expect(DEFAULT_PROJECT_SETTINGS.heartbeatScopeDiscipline).toBe("strict");
     expect(isProjectSettingsKey("heartbeatScopeDiscipline")).toBe(true);
diff --git a/packages/dashboard/app/components/SettingsModal.tsx b/packages/dashboard/app/components/SettingsModal.tsx
index fcdd2df02b..3e891f7af7 100644
--- a/packages/dashboard/app/components/SettingsModal.tsx
+++ b/packages/dashboard/app/components/SettingsModal.tsx
@@ -2451,6 +2451,28 @@ export function SettingsModal({
               </select>
               <small>Delete inbox/outbox messages older than this many days. Default: Off. 7 days is the suggested setting.</small>
             </div>
+            <div className="form-group">
+              <label htmlFor="operationalLogRetentionDays">Operational log retention</label>
+              <select
+                id="operationalLogRetentionDays"
+                className="select"
+                value={form.operationalLogRetentionDays ?? 30}
+                onChange={(e) =>
+                  setForm((f) => ({ ...f, operationalLogRetentionDays: Number(e.target.value) || 0 }))
+                }
+              >
+                <option value={0}>Off</option>
+                <option value={7}>7 days</option>
+                <option value={14}>14 days</option>
+                <option value={30}>30 days</option>
+                <option value={60}>60 days</option>
+                <option value={90}>90 days</option>
+              </select>
+              <small>
+                Lowering this window means Reliability metrics/charts and the Activity feed will not show history older
+                than the selected range. Per-task task detail history is unaffected. Default: 30 days.
+              </small>
+            </div>
             <h4 className="settings-section-heading settings-section-heading--spaced">Chat Rooms</h4>
             <div className="form-group">
               <label htmlFor="chatRoomRecentVerbatimMessages">Recent verbatim room messages</label>
@@ -6108,31 +6130,6 @@ export function SettingsModal({
               )}
             </div>
 
-            <h4 className="settings-section-heading settings-section-heading--spaced">Database Maintenance</h4>
-            <div className="form-group">
-              <label htmlFor="operationalLogRetentionDays">Operational log retention</label>
-              <select
-                id="operationalLogRetentionDays"
-                className="select"
-                value={form.operationalLogRetentionDays ?? 0}
-                onChange={(e) =>
-                  setForm((f) => ({ ...f, operationalLogRetentionDays: Number(e.target.value) || 0 }))
-                }
-              >
-                <option value={0}>Off</option>
-                <option value={30}>30 days</option>
-                <option value={60}>60 days</option>
-                <option value={90}>90 days</option>
-                <option value={180}>180 days</option>
-                <option value={365}>365 days</option>
-              </select>
-              <small>
-                Prune append-only operational logs (activity log, agent logs, run audit, heartbeats) older than this
-                many days during periodic maintenance. Keeps the database from growing without bound — large databases
-                are slower to checkpoint and more prone to corruption. Default: 30 days.
-              </small>
-            </div>
-
             <h4 className="settings-section-heading">Memory Backups</h4>
             <div className="form-group">
               <label htmlFor="memoryBackupEnabled" className="checkbox-label">
diff --git a/packages/dashboard/app/components/__tests__/SettingsModal.test.tsx b/packages/dashboard/app/components/__tests__/SettingsModal.test.tsx
index 0941db7d29..fb8f7c3d83 100644
--- a/packages/dashboard/app/components/__tests__/SettingsModal.test.tsx
+++ b/packages/dashboard/app/components/__tests__/SettingsModal.test.tsx
@@ -997,6 +997,14 @@ describe("SettingsModal", () => {
         scope: "project",
         expectedKey: "chatAutoCleanupDays",
       },
+      {
+        section: "Project General",
+        label: "Operational log retention",
+        kind: "select",
+        value: 7,
+        scope: "project",
+        expectedKey: "operationalLogRetentionDays",
+      },
     ])("persists $expectedKey through the expected settings scope", async (input) => {
       await expectSettingPersists(input);
     });
diff --git a/packages/dashboard/src/__tests__/routes-settings.test.ts b/packages/dashboard/src/__tests__/routes-settings.test.ts
index f78fa98894..ec6a4757d7 100644
--- a/packages/dashboard/src/__tests__/routes-settings.test.ts
+++ b/packages/dashboard/src/__tests__/routes-settings.test.ts
@@ -810,6 +810,27 @@ describe("PUT /settings", () => {
     expect(store.updateSettings).not.toHaveBeenCalled();
   });
 
+  it("accepts allowed operationalLogRetentionDays values", async () => {
+    for (const value of [7, 0]) {
+      const res = await REQUEST(buildApp(), "PUT", "/api/settings", JSON.stringify({ operationalLogRetentionDays: value }), {
+        "Content-Type": "application/json",
+      });
+
+      expect(res.status).toBe(200);
+      expect(store.updateSettings).toHaveBeenCalledWith({ operationalLogRetentionDays: value });
+    }
+  });
+
+  it("rejects invalid operationalLogRetentionDays values", async () => {
+    const res = await REQUEST(buildApp(), "PUT", "/api/settings", JSON.stringify({ operationalLogRetentionDays: 45 }), {
+      "Content-Type": "application/json",
+    });
+
+    expect(res.status).toBe(400);
+    expect(res.body.error).toContain("operationalLogRetentionDays");
+    expect(store.updateSettings).not.toHaveBeenCalledWith({ operationalLogRetentionDays: 45 });
+  });
+
   it("accepts partial remoteAccess patches and GET /settings returns merged sibling branches", async () => {
     const mergedRemoteAccess = {
       enabled: true,
diff --git a/packages/dashboard/src/routes/register-settings-memory-routes.ts b/packages/dashboard/src/routes/register-settings-memory-routes.ts
index 03f2524dea..620095cf80 100644
--- a/packages/dashboard/src/routes/register-settings-memory-routes.ts
+++ b/packages/dashboard/src/routes/register-settings-memory-routes.ts
@@ -614,6 +614,16 @@ export function registerSettingsMemoryRoutes(ctx: ApiRoutesContext, deps: Settin
           throw badRequest("doneAutoArchiveDays must be an integer between 0 and 3650");
         }
       }
+      const operationalLogRetentionDays = clientSettings.operationalLogRetentionDays;
+      if (operationalLogRetentionDays !== undefined && operationalLogRetentionDays !== null) {
+        if (
+          typeof operationalLogRetentionDays !== "number"
+          || !Number.isInteger(operationalLogRetentionDays)
+          || ![0, 7, 14, 30, 60, 90].includes(operationalLogRetentionDays)
+        ) {
+          throw badRequest("operationalLogRetentionDays must be one of: 0, 7, 14, 30, 60, 90");
+        }
+      }
       if (
         clientSettings.archiveAgentLogMode !== undefined &&
         !["none", "compact", "full"].includes(clientSettings.archiveAgentLogMode)