diff --git a/lib/reducers/alert-reducer.js b/lib/reducers/alert-reducer.js
--- a/lib/reducers/alert-reducer.js
+++ b/lib/reducers/alert-reducer.js
@@ -4,12 +4,40 @@
   incrementColdStartCountActionType,
   recordAlertActionType,
 } from '../actions/alert-actions.js';
+import { setClientDBStoreActionType } from '../actions/client-db-store-actions.js';
+import type { SyncedMetadataStoreOperation } from '../ops/synced-metadata-store-ops.js';
 import type { AlertStore } from '../types/alert-types.js';
 import type { BaseAction } from '../types/redux-types';
+import { syncedMetadataNames } from '../types/synced-metadata-types.js';
 
-function reduceAlertStore(state: AlertStore, action: BaseAction): AlertStore {
+type ReduceAlertStoreResult = {
+  +alertStore: AlertStore,
+  +syncedMetadataStoreOperations: $ReadOnlyArray<SyncedMetadataStoreOperation>,
+};
+
+function getUpdatedAlertStoreResult(
+  alertStore: AlertStore,
+): ReduceAlertStoreResult {
+  return {
+    alertStore,
+    syncedMetadataStoreOperations: [
+      {
+        type: 'replace_synced_metadata_entry',
+        payload: {
+          name: syncedMetadataNames.ALERT_STORE,
+          data: JSON.stringify(alertStore),
+        },
+      },
+    ],
+  };
+}
+
+function reduceAlertStore(
+  state: AlertStore,
+  action: BaseAction,
+): ReduceAlertStoreResult {
   if (action.type === recordAlertActionType) {
-    return {
+    return getUpdatedAlertStoreResult({
       ...state,
       alertInfos: {
         ...state.alertInfos,
@@ -20,7 +48,7 @@
           lastAlertTime: action.payload.time,
         },
       },
-    };
+    });
   } else if (action.type === incrementColdStartCountActionType) {
     const newAlertInfos = Object.fromEntries(
       Object.entries(state.alertInfos).map(([alertType, info]) => [
@@ -32,13 +60,30 @@
       ]),
     );
 
-    return {
+    return getUpdatedAlertStoreResult({
       ...state,
       alertInfos: newAlertInfos,
+    });
+  } else if (action.type === setClientDBStoreActionType) {
+    let alertStore = { ...state };
+    const alertStoreString =
+      action.payload.syncedMetadata?.[syncedMetadataNames.ALERT_STORE];
+    if (alertStoreString) {
+      alertStore = {
+        ...alertStore,
+        ...JSON.parse(alertStoreString),
+      };
+    }
+    return {
+      alertStore,
+      syncedMetadataStoreOperations: [],
     };
   }
 
-  return state;
+  return {
+    alertStore: state,
+    syncedMetadataStoreOperations: [],
+  };
 }
 
 export { reduceAlertStore };
diff --git a/lib/reducers/master-reducer.js b/lib/reducers/master-reducer.js
--- a/lib/reducers/master-reducer.js
+++ b/lib/reducers/master-reducer.js
@@ -187,6 +187,8 @@
     action,
   );
 
+  const { alertStore } = reduceAlertStore(state.alertStore, action);
+
   const { syncedMetadataStore, syncedMetadataStoreOperations } =
     reduceSyncedMetadataStore(state.syncedMetadataStore, action);
 
@@ -248,7 +250,7 @@
         action,
         threadStore,
       ),
-      alertStore: reduceAlertStore(state.alertStore, action),
+      alertStore,
       lifecycleState: reduceLifecycleState(state.lifecycleState, action),
       enabledApps,
       reportStore,
diff --git a/lib/types/synced-metadata-types.js b/lib/types/synced-metadata-types.js
--- a/lib/types/synced-metadata-types.js
+++ b/lib/types/synced-metadata-types.js
@@ -11,6 +11,7 @@
   STORE_VERSION: 'store_version',
   ENABLED_APPS: 'enabled_apps',
   GLOBAL_THEME_INFO: 'global_theme_info',
+  ALERT_STORE: 'alert_store',
 });
 type SyncedMetadataName = $Values<typeof syncedMetadataNames>;