diff --git a/app/src/main/java/at/bitfire/icsdroid/db/dao/SubscriptionsDao.kt b/app/src/main/java/at/bitfire/icsdroid/db/dao/SubscriptionsDao.kt
index a8b5487a..66c67dd5 100644
--- a/app/src/main/java/at/bitfire/icsdroid/db/dao/SubscriptionsDao.kt
+++ b/app/src/main/java/at/bitfire/icsdroid/db/dao/SubscriptionsDao.kt
@@ -17,10 +17,10 @@ import kotlinx.coroutines.flow.Flow
 interface SubscriptionsDao {
 
     @Insert
-    fun add(subscription: Subscription): Long
+    suspend fun add(subscription: Subscription): Long
 
     @Delete
-    fun delete(vararg subscriptions: Subscription)
+    suspend fun delete(vararg subscriptions: Subscription)
 
     @Deprecated(
         message = "Replace LiveData by Flows",
@@ -33,16 +33,16 @@ interface SubscriptionsDao {
     fun getAllFlow(): Flow<List<Subscription>>
 
     @Query("SELECT * FROM subscriptions")
-    fun getAll(): List<Subscription>
+    suspend fun getAll(): List<Subscription>
 
     @Query("SELECT * FROM subscriptions WHERE id=:id")
-    fun getById(id: Long): Subscription?
+    suspend fun getById(id: Long): Subscription?
 
     @Query("SELECT * FROM subscriptions WHERE calendarId=:calendarId")
-    fun getByCalendarId(calendarId: Long?): Subscription?
+    suspend fun getByCalendarId(calendarId: Long?): Subscription?
 
     @Query("SELECT * FROM subscriptions WHERE url=:url")
-    fun getByUrl(url: String): Subscription?
+    suspend fun getByUrl(url: String): Subscription?
 
     @Deprecated(
         message = "Replace LiveData by Flows",
@@ -65,22 +65,22 @@ interface SubscriptionsDao {
     fun getErrorMessageFlow(id: Long): Flow<String?>
 
     @Update
-    fun update(subscription: Subscription)
+    suspend fun update(subscription: Subscription)
 
     @Query("UPDATE subscriptions SET calendarId=:calendarId WHERE id=:id")
-    fun updateCalendarId(id: Long, calendarId: Long?)
+    suspend fun updateCalendarId(id: Long, calendarId: Long?)
 
     @Query("UPDATE subscriptions SET lastSync=:lastSync, errorMessage=null WHERE id=:id")
-    fun updateStatusNotModified(id: Long, lastSync: Long = System.currentTimeMillis())
+    suspend fun updateStatusNotModified(id: Long, lastSync: Long = System.currentTimeMillis())
 
     @Query("UPDATE subscriptions SET eTag=:eTag, lastModified=:lastModified, lastSync=:lastSync, errorMessage=null WHERE id=:id")
-    fun updateStatusSuccess(id: Long, eTag: String?, lastModified: Long?, lastSync: Long = System.currentTimeMillis())
+    suspend fun updateStatusSuccess(id: Long, eTag: String?, lastModified: Long?, lastSync: Long = System.currentTimeMillis())
 
     @Query("UPDATE subscriptions SET errorMessage=:message WHERE id=:id")
-    fun updateStatusError(id: Long, message: String?)
+    suspend fun updateStatusError(id: Long, message: String?)
 
     @Query("UPDATE subscriptions SET url=:url WHERE id=:id")
-    fun updateUrl(id: Long, url: Uri)
+    suspend fun updateUrl(id: Long, url: Uri)
 
 
     data class SubscriptionWithCredential(