ABC-73 Move session clean-up to daily task (#8095)

* Move session clean-up to daily task

* Split delete query into batches

cmd/platform/server.go

@@ -21,6 +21,10 @@ import (
 	"github.com/spf13/cobra"
 )
 
+const (
+	SESSIONS_CLEANUP_BATCH_SIZE = 1000
+)
+
 var MaxNotificationsPerChannelDefault int64 = 1000000
 
 var serverCmd = &cobra.Command{
@@ -120,7 +124,7 @@ func runServer(configFileLocation string, disableConfigWatch bool) {
 
 	go runSecurityJob(a)
 	go runDiagnosticsJob(a)
-
+	go runSessionCleanupJob(a)
 	go runTokenCleanupJob(a)
 	go runCommandWebhookCleanupJob(a)
 
@@ -198,6 +202,13 @@ func runCommandWebhookCleanupJob(a *app.App) {
 	}, time.Hour*1)
 }
 
+func runSessionCleanupJob(a *app.App) {
+	doSessionCleanup(a)
+	model.CreateRecurringTask("Session Cleanup", func() {
+		doSessionCleanup(a)
+	}, time.Hour*24)
+}
+
 func resetStatuses(a *app.App) {
 	if result := <-a.Srv.Store.Status().ResetAll(); result.Err != nil {
 		l4g.Error(utils.T("mattermost.reset_status.error"), result.Err.Error())
@@ -221,3 +232,7 @@ func doTokenCleanup(a *app.App) {
 func doCommandWebhookCleanup(a *app.App) {
 	a.Srv.Store.CommandWebhook().Cleanup()
 }
+
+func doSessionCleanup(a *app.App) {
+	a.Srv.Store.Session().Cleanup(model.GetMillis(), SESSIONS_CLEANUP_BATCH_SIZE)
+}