diff --git a/services/document-updater/app/js/RedisManager.js b/services/document-updater/app/js/RedisManager.js
index 7011de6b4d..a5c56c4904 100644
--- a/services/document-updater/app/js/RedisManager.js
+++ b/services/document-updater/app/js/RedisManager.js
@@ -16,6 +16,7 @@ const rclient = RedisWrapper.createClient(Settings.redis.documentupdater)
 // hold us up, and need to bail out quickly if there is a problem.
 const MAX_REDIS_REQUEST_LENGTH = 5000 // 5 seconds
 const PROJECT_BLOCK_TTL_SECS = 30
+const ONE_DAY_SECS = 24 * 60 * 60
 
 // Make times easy to read
 const minutes = 60 // seconds for Redis expire
@@ -575,6 +576,8 @@ const RedisManager = {
     await rclient.set(
       keys.projectNotificationTimestamp({ project_id: projectId }),
       timestamp,
+      'EX',
+      7 * ONE_DAY_SECS,
       'NX'
     )
   },
diff --git a/services/document-updater/scripts/project_notifications.mts b/services/document-updater/scripts/project_notifications.mts
index 0791551ef7..e25e1ae7dd 100644
--- a/services/document-updater/scripts/project_notifications.mts
+++ b/services/document-updater/scripts/project_notifications.mts
@@ -384,6 +384,9 @@ async function getProjectsToNotify(): Promise<{
         for (const c of candidates) {
           if (!projectsWithCollaborators.has(c.projectId)) {
             stats.skippedNoCollaborators++
+            if (!dryRun) {
+              await deleteProjectNotificationTimestamp(c.projectId, c.timestamp)
+            }
             continue
           }
           stats.matched++