diff --git a/app/build.gradle b/app/build.gradle
index 17e421829..8150e2dec 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -169,7 +169,7 @@ dependencies {
     implementation("androidx.lifecycle:lifecycle-common-java8:$lifecycle_version")
 
     //room
-    def room_version = '2.3.0'
+    def room_version = '2.4.0-beta02'
     implementation("androidx.room:room-runtime:$room_version")
     implementation("androidx.room:room-ktx:$room_version")
     kapt("androidx.room:room-compiler:$room_version")
diff --git a/app/src/main/java/io/legado/app/data/entities/Book.kt b/app/src/main/java/io/legado/app/data/entities/Book.kt
index 79fc9dbe2..5b61a6cc7 100644
--- a/app/src/main/java/io/legado/app/data/entities/Book.kt
+++ b/app/src/main/java/io/legado/app/data/entities/Book.kt
@@ -56,9 +56,6 @@ data class Book(
     var readConfig: ReadConfig? = null
 ) : Parcelable, BaseBook {
 
-    @Ignore
-    constructor() : this(bookUrl = "")
-
     fun isLocalBook(): Boolean {
         return origin == BookType.local
     }
diff --git a/app/src/main/java/io/legado/app/data/entities/BookChapter.kt b/app/src/main/java/io/legado/app/data/entities/BookChapter.kt
index 48f4fc3bf..39b8ea6b0 100644
--- a/app/src/main/java/io/legado/app/data/entities/BookChapter.kt
+++ b/app/src/main/java/io/legado/app/data/entities/BookChapter.kt
@@ -47,9 +47,6 @@ data class BookChapter(
     var variable: String? = null        //变量
 ) : Parcelable, RuleDataInterface {
 
-    @Ignore
-    constructor() : this(url = "", bookUrl = "")
-
     @delegate:Transient
     @delegate:Ignore
     @IgnoredOnParcel
diff --git a/app/src/main/java/io/legado/app/data/entities/BookGroup.kt b/app/src/main/java/io/legado/app/data/entities/BookGroup.kt
index 78cc44cce..f19f5f05c 100644
--- a/app/src/main/java/io/legado/app/data/entities/BookGroup.kt
+++ b/app/src/main/java/io/legado/app/data/entities/BookGroup.kt
@@ -3,7 +3,6 @@ package io.legado.app.data.entities
 import android.content.Context
 import android.os.Parcelable
 import androidx.room.Entity
-import androidx.room.Ignore
 import androidx.room.PrimaryKey
 import io.legado.app.R
 import io.legado.app.constant.AppConst
@@ -20,9 +19,6 @@ data class BookGroup(
     var show: Boolean = true
 ) : Parcelable {
 
-    @Ignore
-    constructor() : this(groupName = "")
-
     fun getManageName(context: Context): String {
         return when (groupId) {
             AppConst.bookGroupAllId -> "$groupName(${context.getString(R.string.all)})"
diff --git a/app/src/main/java/io/legado/app/data/entities/BookSource.kt b/app/src/main/java/io/legado/app/data/entities/BookSource.kt
index bcc222ba5..12cf72bb9 100644
--- a/app/src/main/java/io/legado/app/data/entities/BookSource.kt
+++ b/app/src/main/java/io/legado/app/data/entities/BookSource.kt
@@ -46,9 +46,6 @@ data class BookSource(
     var ruleContent: ContentRule? = null            // 正文页规则
 ) : Parcelable, BaseSource {
 
-    @Ignore
-    constructor() : this(bookSourceUrl = "")
-
     override fun getTag(): String {
         return bookSourceName
     }
diff --git a/app/src/main/java/io/legado/app/data/entities/Bookmark.kt b/app/src/main/java/io/legado/app/data/entities/Bookmark.kt
index e844fb4b8..109397042 100644
--- a/app/src/main/java/io/legado/app/data/entities/Bookmark.kt
+++ b/app/src/main/java/io/legado/app/data/entities/Bookmark.kt
@@ -2,7 +2,6 @@ package io.legado.app.data.entities
 
 import android.os.Parcelable
 import androidx.room.Entity
-import androidx.room.Ignore
 import androidx.room.Index
 import androidx.room.PrimaryKey
 import kotlinx.parcelize.Parcelize
@@ -22,9 +21,4 @@ data class Bookmark(
     var chapterName: String = "",
     var bookText: String = "",
     var content: String = ""
-) : Parcelable {
-
-    @Ignore
-    constructor() : this(time = System.currentTimeMillis())
-
-}
\ No newline at end of file
+) : Parcelable
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/data/entities/Cache.kt b/app/src/main/java/io/legado/app/data/entities/Cache.kt
index 39c0bd808..f9687dea7 100644
--- a/app/src/main/java/io/legado/app/data/entities/Cache.kt
+++ b/app/src/main/java/io/legado/app/data/entities/Cache.kt
@@ -1,7 +1,6 @@
 package io.legado.app.data.entities
 
 import androidx.room.Entity
-import androidx.room.Ignore
 import androidx.room.Index
 import androidx.room.PrimaryKey
 
@@ -11,9 +10,4 @@ data class Cache(
     val key: String = "",
     var value: String? = null,
     var deadline: Long = 0L
-) {
-
-    @Ignore
-    constructor() : this(key = "")
-
-}
\ No newline at end of file
+)
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/data/entities/Cookie.kt b/app/src/main/java/io/legado/app/data/entities/Cookie.kt
index 193fb643c..8e12febf4 100644
--- a/app/src/main/java/io/legado/app/data/entities/Cookie.kt
+++ b/app/src/main/java/io/legado/app/data/entities/Cookie.kt
@@ -1,7 +1,6 @@
 package io.legado.app.data.entities
 
 import androidx.room.Entity
-import androidx.room.Ignore
 import androidx.room.Index
 import androidx.room.PrimaryKey
 
@@ -10,9 +9,4 @@ data class Cookie(
     @PrimaryKey
     var url: String = "",
     var cookie: String = ""
-) {
-
-    @Ignore
-    constructor() : this(url = "")
-
-}
\ No newline at end of file
+)
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/data/entities/HttpTTS.kt b/app/src/main/java/io/legado/app/data/entities/HttpTTS.kt
index 0fff5786e..3b1db4512 100644
--- a/app/src/main/java/io/legado/app/data/entities/HttpTTS.kt
+++ b/app/src/main/java/io/legado/app/data/entities/HttpTTS.kt
@@ -1,7 +1,6 @@
 package io.legado.app.data.entities
 
 import androidx.room.Entity
-import androidx.room.Ignore
 import androidx.room.PrimaryKey
 import com.jayway.jsonpath.DocumentContext
 import io.legado.app.utils.GSON
@@ -26,9 +25,6 @@ data class HttpTTS(
     var loginCheckJs: String? = null,
 ) : BaseSource {
 
-    @Ignore
-    constructor() : this(id = System.currentTimeMillis())
-
     override fun getTag(): String {
         return name
     }
diff --git a/app/src/main/java/io/legado/app/data/entities/ReadRecord.kt b/app/src/main/java/io/legado/app/data/entities/ReadRecord.kt
index b12246c62..2b2b5caf4 100644
--- a/app/src/main/java/io/legado/app/data/entities/ReadRecord.kt
+++ b/app/src/main/java/io/legado/app/data/entities/ReadRecord.kt
@@ -1,16 +1,10 @@
 package io.legado.app.data.entities
 
 import androidx.room.Entity
-import androidx.room.Ignore
 
 @Entity(tableName = "readRecord", primaryKeys = ["deviceId", "bookName"])
 data class ReadRecord(
     var deviceId: String = "",
     var bookName: String = "",
     var readTime: Long = 0L
-) {
-
-    @Ignore
-    constructor() : this(deviceId = "")
-
-}
\ No newline at end of file
+)
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/data/entities/ReadRecordShow.kt b/app/src/main/java/io/legado/app/data/entities/ReadRecordShow.kt
index 0ede36a84..79795b0d9 100644
--- a/app/src/main/java/io/legado/app/data/entities/ReadRecordShow.kt
+++ b/app/src/main/java/io/legado/app/data/entities/ReadRecordShow.kt
@@ -1,13 +1,6 @@
 package io.legado.app.data.entities
 
-import androidx.room.Ignore
-
 data class ReadRecordShow(
     var bookName: String = "",
     var readTime: Long = 0L
-) {
-
-    @Ignore
-    constructor() : this("")
-
-}
\ No newline at end of file
+)
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/data/entities/ReplaceRule.kt b/app/src/main/java/io/legado/app/data/entities/ReplaceRule.kt
index be085a9fc..2941a4d5a 100644
--- a/app/src/main/java/io/legado/app/data/entities/ReplaceRule.kt
+++ b/app/src/main/java/io/legado/app/data/entities/ReplaceRule.kt
@@ -2,7 +2,10 @@ package io.legado.app.data.entities
 
 import android.os.Parcelable
 import android.text.TextUtils
-import androidx.room.*
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.Index
+import androidx.room.PrimaryKey
 import kotlinx.parcelize.Parcelize
 import java.util.regex.Pattern
 import java.util.regex.PatternSyntaxException
@@ -26,9 +29,6 @@ data class ReplaceRule(
     var order: Int = 0
 ) : Parcelable {
 
-    @Ignore
-    constructor() : this(id = System.currentTimeMillis())
-
     override fun equals(other: Any?): Boolean {
         if (other is ReplaceRule) {
             return other.id == id
diff --git a/app/src/main/java/io/legado/app/data/entities/RssArticle.kt b/app/src/main/java/io/legado/app/data/entities/RssArticle.kt
index 8928ddc28..911fb16b8 100644
--- a/app/src/main/java/io/legado/app/data/entities/RssArticle.kt
+++ b/app/src/main/java/io/legado/app/data/entities/RssArticle.kt
@@ -26,9 +26,6 @@ data class RssArticle(
     var variable: String? = null
 ) : RuleDataInterface {
 
-    @Ignore
-    constructor() : this("")
-
     override fun hashCode() = link.hashCode()
 
     override fun equals(other: Any?): Boolean {
diff --git a/app/src/main/java/io/legado/app/data/entities/RssReadRecord.kt b/app/src/main/java/io/legado/app/data/entities/RssReadRecord.kt
index 2a54427dd..edbb4c15d 100644
--- a/app/src/main/java/io/legado/app/data/entities/RssReadRecord.kt
+++ b/app/src/main/java/io/legado/app/data/entities/RssReadRecord.kt
@@ -1,13 +1,7 @@
 package io.legado.app.data.entities
 
 import androidx.room.Entity
-import androidx.room.Ignore
 import androidx.room.PrimaryKey
 
 @Entity(tableName = "rssReadRecords")
-data class RssReadRecord(@PrimaryKey val record: String, val read: Boolean = true) {
-
-    @Ignore
-    constructor() : this("")
-
-}
\ No newline at end of file
+data class RssReadRecord(@PrimaryKey val record: String, val read: Boolean = true)
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/data/entities/RssSource.kt b/app/src/main/java/io/legado/app/data/entities/RssSource.kt
index 7f9c97051..78830285a 100644
--- a/app/src/main/java/io/legado/app/data/entities/RssSource.kt
+++ b/app/src/main/java/io/legado/app/data/entities/RssSource.kt
@@ -2,7 +2,6 @@ package io.legado.app.data.entities
 
 import android.os.Parcelable
 import androidx.room.Entity
-import androidx.room.Ignore
 import androidx.room.Index
 import androidx.room.PrimaryKey
 import com.jayway.jsonpath.DocumentContext
@@ -44,9 +43,6 @@ data class RssSource(
     var customOrder: Int = 0
 ) : Parcelable, BaseSource {
 
-    @Ignore
-    constructor() : this("")
-
     override fun getTag(): String {
         return sourceName
     }
diff --git a/app/src/main/java/io/legado/app/data/entities/RssStar.kt b/app/src/main/java/io/legado/app/data/entities/RssStar.kt
index fc696cf94..df4bd546f 100644
--- a/app/src/main/java/io/legado/app/data/entities/RssStar.kt
+++ b/app/src/main/java/io/legado/app/data/entities/RssStar.kt
@@ -25,9 +25,6 @@ data class RssStar(
     var variable: String? = null
 ) : RuleDataInterface {
 
-    @Ignore
-    constructor() : this("")
-
     @delegate:Transient
     @delegate:Ignore
     @IgnoredOnParcel
diff --git a/app/src/main/java/io/legado/app/data/entities/RuleSub.kt b/app/src/main/java/io/legado/app/data/entities/RuleSub.kt
index bc9c250d0..2b43787fe 100644
--- a/app/src/main/java/io/legado/app/data/entities/RuleSub.kt
+++ b/app/src/main/java/io/legado/app/data/entities/RuleSub.kt
@@ -1,7 +1,6 @@
 package io.legado.app.data.entities
 
 import androidx.room.Entity
-import androidx.room.Ignore
 import androidx.room.PrimaryKey
 
 @Entity(tableName = "ruleSubs")
@@ -14,9 +13,4 @@ data class RuleSub(
     var customOrder: Int = 0,
     var autoUpdate: Boolean = false,
     var update: Long = System.currentTimeMillis()
-) {
-
-    @Ignore
-    constructor() : this(name = "")
-
-}
+)
diff --git a/app/src/main/java/io/legado/app/data/entities/SearchBook.kt b/app/src/main/java/io/legado/app/data/entities/SearchBook.kt
index 6169aa6d0..96c525b3a 100644
--- a/app/src/main/java/io/legado/app/data/entities/SearchBook.kt
+++ b/app/src/main/java/io/legado/app/data/entities/SearchBook.kt
@@ -40,9 +40,6 @@ data class SearchBook(
     var originOrder: Int = 0
 ) : Parcelable, BaseBook, Comparable<SearchBook> {
 
-    @Ignore
-    constructor() : this(bookUrl = "")
-
     @Ignore
     @IgnoredOnParcel
     override var infoHtml: String? = null
diff --git a/app/src/main/java/io/legado/app/data/entities/SearchKeyword.kt b/app/src/main/java/io/legado/app/data/entities/SearchKeyword.kt
index ade4a5551..955e5fe3d 100644
--- a/app/src/main/java/io/legado/app/data/entities/SearchKeyword.kt
+++ b/app/src/main/java/io/legado/app/data/entities/SearchKeyword.kt
@@ -2,7 +2,6 @@ package io.legado.app.data.entities
 
 import android.os.Parcelable
 import androidx.room.Entity
-import androidx.room.Ignore
 import androidx.room.Index
 import androidx.room.PrimaryKey
 import kotlinx.parcelize.Parcelize
@@ -15,9 +14,4 @@ data class SearchKeyword(
     var word: String = "",                      // 搜索关键词
     var usage: Int = 1,                         // 使用次数
     var lastUseTime: Long = System.currentTimeMillis()      // 最后一次使用时间
-) : Parcelable {
-
-    @Ignore
-    constructor() : this(word = "")
-
-}
+) : Parcelable