diff --git a/app/src/main/java/org/koitharu/kotatsu/core/backup/BackupRepository.kt b/app/src/main/java/org/koitharu/kotatsu/core/backup/BackupRepository.kt
index 2823b97b9..6d934330a 100644
--- a/app/src/main/java/org/koitharu/kotatsu/core/backup/BackupRepository.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/core/backup/BackupRepository.kt
@@ -83,6 +83,7 @@ class BackupRepository(private val db: MangaDatabase) {
 		jo.put("url", url)
 		jo.put("public_url", publicUrl)
 		jo.put("rating", rating)
+		jo.put("nsfw", isNsfw)
 		jo.put("cover_url", coverUrl)
 		jo.put("large_cover_url", largeCoverUrl)
 		jo.put("state", state)
diff --git a/app/src/main/java/org/koitharu/kotatsu/core/backup/RestoreRepository.kt b/app/src/main/java/org/koitharu/kotatsu/core/backup/RestoreRepository.kt
index 4a0e1c368..86b732b27 100644
--- a/app/src/main/java/org/koitharu/kotatsu/core/backup/RestoreRepository.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/core/backup/RestoreRepository.kt
@@ -8,6 +8,7 @@ import org.koitharu.kotatsu.core.db.entity.TagEntity
 import org.koitharu.kotatsu.favourites.data.FavouriteCategoryEntity
 import org.koitharu.kotatsu.favourites.data.FavouriteEntity
 import org.koitharu.kotatsu.history.data.HistoryEntity
+import org.koitharu.kotatsu.utils.ext.getBooleanOrDefault
 import org.koitharu.kotatsu.utils.ext.getStringOrNull
 import org.koitharu.kotatsu.utils.ext.iterator
 import org.koitharu.kotatsu.utils.ext.map
@@ -72,6 +73,7 @@ class RestoreRepository(private val db: MangaDatabase) {
 		url = json.getString("url"),
 		publicUrl = json.getStringOrNull("public_url").orEmpty(),
 		rating = json.getDouble("rating").toFloat(),
+		isNsfw = json.getBooleanOrDefault("nsfw", false),
 		coverUrl = json.getString("cover_url"),
 		largeCoverUrl = json.getStringOrNull("large_cover_url"),
 		state = json.getStringOrNull("state"),
diff --git a/app/src/main/java/org/koitharu/kotatsu/core/db/DatabaseModule.kt b/app/src/main/java/org/koitharu/kotatsu/core/db/DatabaseModule.kt
index 59906c088..de6aead18 100644
--- a/app/src/main/java/org/koitharu/kotatsu/core/db/DatabaseModule.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/core/db/DatabaseModule.kt
@@ -18,7 +18,8 @@ val databaseModule
 				Migration3To4(),
 				Migration4To5(),
 				Migration5To6(),
-				Migration6To7()
+				Migration6To7(),
+				Migration7To8(),
 			).addCallback(
 				DatabasePrePopulateCallback(androidContext().resources)
 			).build()
diff --git a/app/src/main/java/org/koitharu/kotatsu/core/db/MangaDatabase.kt b/app/src/main/java/org/koitharu/kotatsu/core/db/MangaDatabase.kt
index 0090e416d..f0844571e 100644
--- a/app/src/main/java/org/koitharu/kotatsu/core/db/MangaDatabase.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/core/db/MangaDatabase.kt
@@ -15,8 +15,8 @@ import org.koitharu.kotatsu.history.data.HistoryEntity
 	entities = [
 		MangaEntity::class, TagEntity::class, HistoryEntity::class, MangaTagsEntity::class,
 		FavouriteCategoryEntity::class, FavouriteEntity::class, MangaPrefsEntity::class,
-		TrackEntity::class, TrackLogEntity::class
-	], version = 7
+		TrackEntity::class, TrackLogEntity::class, SuggestionEntity::class
+	], version = 8
 )
 abstract class MangaDatabase : RoomDatabase() {
 
diff --git a/app/src/main/java/org/koitharu/kotatsu/core/db/entity/MangaEntity.kt b/app/src/main/java/org/koitharu/kotatsu/core/db/entity/MangaEntity.kt
index b4b4152a1..d20b3b979 100644
--- a/app/src/main/java/org/koitharu/kotatsu/core/db/entity/MangaEntity.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/core/db/entity/MangaEntity.kt
@@ -13,14 +13,15 @@ data class MangaEntity(
 	@PrimaryKey(autoGenerate = false)
 	@ColumnInfo(name = "manga_id") val id: Long,
 	@ColumnInfo(name = "title") val title: String,
-	@ColumnInfo(name = "alt_title") val altTitle: String? = null,
+	@ColumnInfo(name = "alt_title") val altTitle: String?,
 	@ColumnInfo(name = "url") val url: String,
 	@ColumnInfo(name = "public_url") val publicUrl: String,
-	@ColumnInfo(name = "rating") val rating: Float = Manga.NO_RATING, //normalized value [0..1] or -1
+	@ColumnInfo(name = "rating") val rating: Float, //normalized value [0..1] or -1
+	@ColumnInfo(name = "nsfw") val isNsfw: Boolean,
 	@ColumnInfo(name = "cover_url") val coverUrl: String,
-	@ColumnInfo(name = "large_cover_url") val largeCoverUrl: String? = null,
-	@ColumnInfo(name = "state") val state: String? = null,
-	@ColumnInfo(name = "author") val author: String? = null,
+	@ColumnInfo(name = "large_cover_url") val largeCoverUrl: String?,
+	@ColumnInfo(name = "state") val state: String?,
+	@ColumnInfo(name = "author") val author: String?,
 	@ColumnInfo(name = "source") val source: String
 ) {
 
@@ -30,6 +31,7 @@ data class MangaEntity(
 		altTitle = this.altTitle,
 		state = this.state?.let { MangaState.valueOf(it) },
 		rating = this.rating,
+		isNsfw = this.isNsfw,
 		url = this.url,
 		publicUrl = this.publicUrl,
 		coverUrl = this.coverUrl,
@@ -50,6 +52,7 @@ data class MangaEntity(
 			coverUrl = manga.coverUrl,
 			altTitle = manga.altTitle,
 			rating = manga.rating,
+			isNsfw = manga.isNsfw,
 			state = manga.state?.name,
 			title = manga.title,
 			author = manga.author
diff --git a/app/src/main/java/org/koitharu/kotatsu/core/db/entity/SuggestionEntity.kt b/app/src/main/java/org/koitharu/kotatsu/core/db/entity/SuggestionEntity.kt
new file mode 100644
index 000000000..896732e15
--- /dev/null
+++ b/app/src/main/java/org/koitharu/kotatsu/core/db/entity/SuggestionEntity.kt
@@ -0,0 +1,24 @@
+package org.koitharu.kotatsu.core.db.entity
+
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.ForeignKey
+import androidx.room.PrimaryKey
+
+@Entity(
+	tableName = "suggestions",
+	foreignKeys = [
+		ForeignKey(
+			entity = MangaEntity::class,
+			parentColumns = ["manga_id"],
+			childColumns = ["manga_id"],
+			onDelete = ForeignKey.CASCADE
+		)
+	]
+)
+data class SuggestionEntity(
+	@PrimaryKey(autoGenerate = false)
+	@ColumnInfo(name = "manga_id", index = true) val mangaId: Long,
+	@ColumnInfo(name = "relevance") val relevance: Float,
+	@ColumnInfo(name = "created_at") val createdAt: Long = System.currentTimeMillis(),
+)
diff --git a/app/src/main/java/org/koitharu/kotatsu/core/db/migrations/Migration7To8.kt b/app/src/main/java/org/koitharu/kotatsu/core/db/migrations/Migration7To8.kt
new file mode 100644
index 000000000..4a4e781f2
--- /dev/null
+++ b/app/src/main/java/org/koitharu/kotatsu/core/db/migrations/Migration7To8.kt
@@ -0,0 +1,13 @@
+package org.koitharu.kotatsu.core.db.migrations
+
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
+
+class Migration7To8 : Migration(7, 8) {
+
+	override fun migrate(database: SupportSQLiteDatabase) {
+		database.execSQL("ALTER TABLE manga ADD COLUMN nsfw INTEGER NOT NULL DEFAULT 0")
+		database.execSQL("CREATE TABLE IF NOT EXISTS suggestions (manga_id INTEGER NOT NULL, relevance REAL NOT NULL, created_at INTEGER NOT NULL, PRIMARY KEY(manga_id), FOREIGN KEY(manga_id) REFERENCES manga(manga_id) ON UPDATE NO ACTION ON DELETE CASCADE )")
+		database.execSQL("CREATE INDEX IF NOT EXISTS index_suggestions_manga_id ON suggestions (manga_id)")
+	}
+}
\ No newline at end of file
diff --git a/app/src/main/java/org/koitharu/kotatsu/core/model/Manga.kt b/app/src/main/java/org/koitharu/kotatsu/core/model/Manga.kt
index 2854df336..f631d2d9d 100644
--- a/app/src/main/java/org/koitharu/kotatsu/core/model/Manga.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/core/model/Manga.kt
@@ -11,6 +11,7 @@ data class Manga(
 	val url: String, // relative url for internal use
 	val publicUrl: String,
 	val rating: Float = NO_RATING, //normalized value [0..1] or -1
+	val isNsfw: Boolean = false,
 	val coverUrl: String,
 	val largeCoverUrl: String? = null,
 	val description: String? = null, //HTML
diff --git a/app/src/main/java/org/koitharu/kotatsu/utils/ext/JsonExt.kt b/app/src/main/java/org/koitharu/kotatsu/utils/ext/JsonExt.kt
index c52492c33..66f96a6e2 100644
--- a/app/src/main/java/org/koitharu/kotatsu/utils/ext/JsonExt.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/utils/ext/JsonExt.kt
@@ -34,6 +34,10 @@ fun JSONObject.getStringOrNull(name: String): String? = opt(name)?.takeUnless {
 	it === JSONObject.NULL
 }?.toString()
 
+fun JSONObject.getBooleanOrDefault(name: String, defaultValue: Boolean): Boolean = opt(name)?.takeUnless {
+	it === JSONObject.NULL
+} as? Boolean ?: defaultValue
+
 operator fun JSONArray.iterator(): Iterator<JSONObject> = JSONIterator(this)
 
 private class JSONIterator(private val array: JSONArray) : Iterator<JSONObject> {