diff --git a/src/renderer/store/slices/teamSlice.ts b/src/renderer/store/slices/teamSlice.ts
index c1f17995..56837103 100644
--- a/src/renderer/store/slices/teamSlice.ts
+++ b/src/renderer/store/slices/teamSlice.ts
@@ -38,6 +38,13 @@ import {
   normalizeTeamGetDataOptions,
 } from '../team/teamDataRequestKeys';
 import { selectTeamDataForName } from '../team/teamDataSelectors';
+import {
+  captureTeamLocalStateEpoch,
+  clearAllTeamLocalStateEpochs,
+  hasTeamLocalStateEpoch,
+  invalidateTeamLocalStateEpoch,
+  isTeamLocalStateEpochCurrent,
+} from '../team/teamLocalStateEpoch';
 import {
   areInboxMessageArraysEquivalent,
   clearTeamMessageSelectorCaches,
@@ -158,7 +165,6 @@ const inFlightTeamMemberActivityMetaRequests = new Map<string, Promise<void>>();
 const pendingFreshTeamMemberActivityMetaRefreshes = new Set<string>();
 const pendingTeamPendingReplyRefreshTimers = new Map<string, ReturnType<typeof setTimeout>>();
 const lastResolvedTeamDataRefreshAtByTeam = new Map<string, number>();
-const teamLocalStateEpochByTeam = new Map<string, number>();
 let inFlightGlobalTasksRefresh: Promise<void> | null = null;
 let pendingFreshGlobalTasksRefresh = false;
 const memberSpawnStatusesIpcBackoffUntilByTeam = new Map<string, number>();
@@ -232,7 +238,7 @@ export function __resetTeamSliceModuleStateForTests(): void {
   pendingTeamPendingReplyRefreshTimers.clear();
   clearAllPendingReplyRefreshWaits();
   lastResolvedTeamDataRefreshAtByTeam.clear();
-  teamLocalStateEpochByTeam.clear();
+  clearAllTeamLocalStateEpochs();
   memberSpawnStatusesIpcBackoffUntilByTeam.clear();
   teamRefreshBurstDiagnostics.clear();
   memberSpawnUiEqualLastWarnAtByTeam.clear();
@@ -432,18 +438,6 @@ function buildTeamScopedProgressTombstones(
   };
 }
 
-function captureTeamLocalStateEpoch(teamName: string): number {
-  return teamLocalStateEpochByTeam.get(teamName) ?? 0;
-}
-
-function isTeamLocalStateEpochCurrent(teamName: string, epoch: number): boolean {
-  return captureTeamLocalStateEpoch(teamName) === epoch;
-}
-
-function invalidateTeamLocalStateEpoch(teamName: string): void {
-  teamLocalStateEpochByTeam.set(teamName, captureTeamLocalStateEpoch(teamName) + 1);
-}
-
 function beginInFlightTeamDataRefresh(teamName: string): symbol {
   const token = Symbol(teamName);
   const existing = inFlightRefreshTeamDataCalls.get(teamName);
@@ -663,7 +657,7 @@ export function __getTeamScopedTransientStateForTests(teamName: string): {
     hasPendingFreshMemberActivityMetaRefresh:
       pendingFreshTeamMemberActivityMetaRefreshes.has(teamName),
     hasLastResolvedTeamDataRefresh: lastResolvedTeamDataRefreshAtByTeam.has(teamName),
-    hasCurrentLocalStateEpoch: teamLocalStateEpochByTeam.has(teamName),
+    hasCurrentLocalStateEpoch: hasTeamLocalStateEpoch(teamName),
     hasMemberSpawnStatusesIpcBackoff: memberSpawnStatusesIpcBackoffUntilByTeam.has(teamName),
     hasTeamRefreshBurstDiagnostics: teamRefreshBurstDiagnostics.has(teamName),
     hasMemberSpawnUiEqualLastWarn: memberSpawnUiEqualLastWarnAtByTeam.has(teamName),
diff --git a/src/renderer/store/team/teamLocalStateEpoch.ts b/src/renderer/store/team/teamLocalStateEpoch.ts
new file mode 100644
index 00000000..4568f082
--- /dev/null
+++ b/src/renderer/store/team/teamLocalStateEpoch.ts
@@ -0,0 +1,25 @@
+const teamLocalStateEpochByTeam = new Map<string, number>();
+
+export function captureTeamLocalStateEpoch(teamName: string): number {
+  return teamLocalStateEpochByTeam.get(teamName) ?? 0;
+}
+
+export function isTeamLocalStateEpochCurrent(teamName: string, epoch: number): boolean {
+  return captureTeamLocalStateEpoch(teamName) === epoch;
+}
+
+export function invalidateTeamLocalStateEpoch(teamName: string): void {
+  teamLocalStateEpochByTeam.set(teamName, captureTeamLocalStateEpoch(teamName) + 1);
+}
+
+export function hasTeamLocalStateEpoch(teamName: string): boolean {
+  return teamLocalStateEpochByTeam.has(teamName);
+}
+
+export function clearTeamLocalStateEpoch(teamName: string): void {
+  teamLocalStateEpochByTeam.delete(teamName);
+}
+
+export function clearAllTeamLocalStateEpochs(): void {
+  teamLocalStateEpochByTeam.clear();
+}
diff --git a/test/renderer/store/teamLocalStateEpoch.test.ts b/test/renderer/store/teamLocalStateEpoch.test.ts
new file mode 100644
index 00000000..3ff503ca
--- /dev/null
+++ b/test/renderer/store/teamLocalStateEpoch.test.ts
@@ -0,0 +1,57 @@
+import { afterEach, describe, expect, it } from 'vitest';
+
+import {
+  captureTeamLocalStateEpoch,
+  clearAllTeamLocalStateEpochs,
+  clearTeamLocalStateEpoch,
+  hasTeamLocalStateEpoch,
+  invalidateTeamLocalStateEpoch,
+  isTeamLocalStateEpochCurrent,
+} from '../../../src/renderer/store/team/teamLocalStateEpoch';
+
+afterEach(() => {
+  clearAllTeamLocalStateEpochs();
+});
+
+describe('teamLocalStateEpoch', () => {
+  it('starts missing teams at epoch zero without materializing an entry', () => {
+    expect(captureTeamLocalStateEpoch('my-team')).toBe(0);
+    expect(isTeamLocalStateEpochCurrent('my-team', 0)).toBe(true);
+    expect(hasTeamLocalStateEpoch('my-team')).toBe(false);
+  });
+
+  it('increments epochs independently per team', () => {
+    invalidateTeamLocalStateEpoch('my-team');
+    invalidateTeamLocalStateEpoch('my-team');
+    invalidateTeamLocalStateEpoch('other-team');
+
+    expect(captureTeamLocalStateEpoch('my-team')).toBe(2);
+    expect(captureTeamLocalStateEpoch('other-team')).toBe(1);
+    expect(isTeamLocalStateEpochCurrent('my-team', 1)).toBe(false);
+    expect(isTeamLocalStateEpochCurrent('my-team', 2)).toBe(true);
+  });
+
+  it('clears one team epoch without touching other teams', () => {
+    invalidateTeamLocalStateEpoch('my-team');
+    invalidateTeamLocalStateEpoch('other-team');
+
+    clearTeamLocalStateEpoch('my-team');
+
+    expect(captureTeamLocalStateEpoch('my-team')).toBe(0);
+    expect(hasTeamLocalStateEpoch('my-team')).toBe(false);
+    expect(captureTeamLocalStateEpoch('other-team')).toBe(1);
+    expect(hasTeamLocalStateEpoch('other-team')).toBe(true);
+  });
+
+  it('clears all materialized epochs', () => {
+    invalidateTeamLocalStateEpoch('my-team');
+    invalidateTeamLocalStateEpoch('other-team');
+
+    clearAllTeamLocalStateEpochs();
+
+    expect(hasTeamLocalStateEpoch('my-team')).toBe(false);
+    expect(hasTeamLocalStateEpoch('other-team')).toBe(false);
+    expect(captureTeamLocalStateEpoch('my-team')).toBe(0);
+    expect(captureTeamLocalStateEpoch('other-team')).toBe(0);
+  });
+});