diff --git a/kernel/go.mod b/kernel/go.mod
index ef1f027cc..c6ae27967 100644
--- a/kernel/go.mod
+++ b/kernel/go.mod
@@ -56,7 +56,7 @@ require (
 	github.com/siyuan-note/filelock v0.0.0-20231211015131-3b3dfabdce9c
 	github.com/siyuan-note/httpclient v0.0.0-20231219001541-d75e4dce39fa
 	github.com/siyuan-note/logging v0.0.0-20231208035918-61f884c854f0
-	github.com/siyuan-note/riff v0.0.0-20231128081053-0cd7a5fa0076
+	github.com/siyuan-note/riff v0.0.0-20231221011852-241358ff96df
 	github.com/spf13/cast v1.6.0
 	github.com/steambap/captcha v1.4.1
 	github.com/studio-b12/gowebdav v0.9.0
diff --git a/kernel/go.sum b/kernel/go.sum
index 7f7683ae1..e0fa88a6c 100644
--- a/kernel/go.sum
+++ b/kernel/go.sum
@@ -366,8 +366,8 @@ github.com/siyuan-note/httpclient v0.0.0-20231219001541-d75e4dce39fa h1:kfWxJzNP
 github.com/siyuan-note/httpclient v0.0.0-20231219001541-d75e4dce39fa/go.mod h1:ejS8ChupXGP89C8N4nM+xhyxVVf/IfcwOXboql6o3+g=
 github.com/siyuan-note/logging v0.0.0-20231208035918-61f884c854f0 h1:+XjUr9UMXsczdO2bGA72p/k9wa2ShPb8ybi7CDBJ7HQ=
 github.com/siyuan-note/logging v0.0.0-20231208035918-61f884c854f0/go.mod h1:6mRFtAAvYPn3cDzqvyv+t8BVPGqpONDMMb5ywOhY1D4=
-github.com/siyuan-note/riff v0.0.0-20231128081053-0cd7a5fa0076 h1:mfXnjcnOyY+2Rhtn5VhWjeYBfdHln9MppR91Yory0M4=
-github.com/siyuan-note/riff v0.0.0-20231128081053-0cd7a5fa0076/go.mod h1:vizseu1SWCiP6lZM2Hx2dJD4t7nCIgChwkJR7B/hQ2A=
+github.com/siyuan-note/riff v0.0.0-20231221011852-241358ff96df h1:v/lE1SBL4wd0cAbhr+o2GAdafBQhhikKauCSKGCkO6M=
+github.com/siyuan-note/riff v0.0.0-20231221011852-241358ff96df/go.mod h1:wLzj67jwt8PM+qWPGlC4V7m0fzkUlkwPKf9vLF6ru/k=
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d h1:zE9ykElWQ6/NYmHa3jpm/yHnI4xSofP+UP6SpjHcSeM=
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
 github.com/smartystreets/goconvey v1.6.7 h1:I6tZjLXD2Q1kjvNbIzB1wvQBsXmKXiVrhpRE8ZjP5jY=
diff --git a/kernel/model/flashcard.go b/kernel/model/flashcard.go
index 306208e54..81b94929d 100644
--- a/kernel/model/flashcard.go
+++ b/kernel/model/flashcard.go
@@ -434,6 +434,7 @@ type Flashcard struct {
 	DeckID   string                 `json:"deckID"`
 	CardID   string                 `json:"cardID"`
 	BlockID  string                 `json:"blockID"`
+	State    riff.State             `json:"state"`
 	NextDues map[riff.Rating]string `json:"nextDues"`
 }
 
@@ -447,6 +448,7 @@ func newFlashcard(card riff.Card, blockID, deckID string, now time.Time) *Flashc
 		DeckID:   deckID,
 		CardID:   card.ID(),
 		BlockID:  blockID,
+		State:    card.GetState(),
 		NextDues: nextDues,
 	}
 }
@@ -632,7 +634,7 @@ func (tx *Transaction) doRemoveFlashcards(operation *Operation) (ret *TxErr) {
 	deckLock.Lock()
 	defer deckLock.Unlock()
 
-	if syncingStorages {
+	if syncingStorages.Load() {
 		ret = &TxErr{code: TxErrCodeDataIsSyncing}
 		return
 	}
@@ -744,7 +746,7 @@ func (tx *Transaction) doAddFlashcards(operation *Operation) (ret *TxErr) {
 	deckLock.Lock()
 	defer deckLock.Unlock()
 
-	if syncingStorages {
+	if syncingStorages.Load() {
 		ret = &TxErr{code: TxErrCodeDataIsSyncing}
 		return
 	}
@@ -991,6 +993,7 @@ func getDeckDueCards(deck *riff.Deck, reviewedCardIDs, blockIDs []string, newCar
 		tmp = append(tmp, c)
 	}
 	dues = tmp
+	tmp = nil
 
 	for _, c := range dues {
 		if 0 < len(blockIDs) && !gulu.Str.Contains(c.BlockID(), blockIDs) {
diff --git a/kernel/model/repository.go b/kernel/model/repository.go
index f4e2b343a..91ea8674b 100644
--- a/kernel/model/repository.go
+++ b/kernel/model/repository.go
@@ -31,6 +31,7 @@ import (
 	"sort"
 	"strings"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/88250/gulu"
@@ -934,10 +935,10 @@ func IndexRepo(memo string) (err error) {
 }
 
 var syncingFiles = sync.Map{}
-var syncingStorages = false
+var syncingStorages = atomic.Bool{}
 
 func waitForSyncingStorages() {
-	for syncingStorages {
+	for syncingStorages.Load() {
 		time.Sleep(time.Second)
 	}
 }
@@ -1129,7 +1130,7 @@ func bootSyncRepo() (err error) {
 	}
 
 	syncingFiles = sync.Map{}
-	syncingStorages = false
+	syncingStorages.Store(false)
 	for _, fetchedFile := range fetchedFiles {
 		name := path.Base(fetchedFile.Path)
 		if strings.HasSuffix(name, ".sy") {
@@ -1138,7 +1139,7 @@ func bootSyncRepo() (err error) {
 			continue
 		}
 		if strings.HasPrefix(fetchedFile.Path, "/storage/") {
-			syncingStorages = true
+			syncingStorages.Store(true)
 		}
 	}
 
@@ -1362,7 +1363,7 @@ func processSyncMergeResult(exit, byHand bool, mergeResult *dejavu.MergeResult,
 	}
 
 	syncingFiles = sync.Map{}
-	syncingStorages = false
+	syncingStorages.Store(false)
 
 	cache.ClearDocsIAL()              // 同步后文档树文档图标没有更新 https://github.com/siyuan-note/siyuan/issues/4939
 	if needFullReindex(upsertTrees) { // 改进同步后全量重建索引判断 https://github.com/siyuan-note/siyuan/issues/5764