Changed the way read posts are handled to support an arbitrary read posts limit (#1720)

* Changed the way read posts are handled to support an arbitrary 'read posts limit'

* Changed db size in summary to kb

* Use return HashSet instead of List in ReadPostsListInterface

* Moved DB summary to Advanced Preferences.

* Completed merge from master into feature/readPost

* Fix some bugs and code style.

---------

Co-authored-by: Docile-Alligator <25734209+Docile-Alligator@users.noreply.github.com>

28 files changed, 454 insertions, 217 deletions

diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/FetchPostFilterReadPostsAndConcatenatedSubredditNames.java b/app/src/main/java/ml/docilealligator/infinityforreddit/FetchPostFilterAndConcatenatedSubredditNames.java
index 2971a150..0d9a7bef 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/FetchPostFilterReadPostsAndConcatenatedSubredditNames.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/FetchPostFilterAndConcatenatedSubredditNames.java
@@ -2,43 +2,22 @@ package ml.docilealligator.infinityforreddit;
 
 import android.os.Handler;
 
-import androidx.annotation.NonNull;
-
-import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.Executor;
 
 import ml.docilealligator.infinityforreddit.account.Account;
 import ml.docilealligator.infinityforreddit.multireddit.AnonymousMultiredditSubreddit;
 import ml.docilealligator.infinityforreddit.postfilter.PostFilter;
-import ml.docilealligator.infinityforreddit.readpost.ReadPost;
 import ml.docilealligator.infinityforreddit.subscribedsubreddit.SubscribedSubredditData;
 
-public class FetchPostFilterReadPostsAndConcatenatedSubredditNames {
-    public interface FetchPostFilterAndReadPostsListener {
-        void success(PostFilter postFilter, ArrayList<String> readPostList);
-    }
-
-    public interface FetchPostFilterAndConcatenatecSubredditNamesListener {
-        void success(PostFilter postFilter, String concatenatedSubredditNames);
-    }
-
-    public static void fetchPostFilterAndReadPosts(RedditDataRoomDatabase redditDataRoomDatabase, Executor executor,
-                                                   Handler handler, @NonNull String accountName, int postFilterUsage,
-                                                   String nameOfUsage, FetchPostFilterAndReadPostsListener fetchPostFilterAndReadPostsListener) {
+public class FetchPostFilterAndConcatenatedSubredditNames {
+    public static void fetchPostFilter(RedditDataRoomDatabase redditDataRoomDatabase, Executor executor,
+                                                   Handler handler, int postFilterUsage,
+                                                   String nameOfUsage, FetchPostFilterListerner fetchPostFilterListerner) {
         executor.execute(() -> {
             List<PostFilter> postFilters = redditDataRoomDatabase.postFilterDao().getValidPostFilters(postFilterUsage, nameOfUsage);
             PostFilter mergedPostFilter = PostFilter.mergePostFilter(postFilters);
-            if (accountName.equals(Account.ANONYMOUS_ACCOUNT)) {
-                handler.post(() -> fetchPostFilterAndReadPostsListener.success(mergedPostFilter, null));
-            } else {
-                List<ReadPost> readPosts = redditDataRoomDatabase.readPostDao().getAllReadPosts(accountName);
-                ArrayList<String> readPostStrings = new ArrayList<>();
-                for (ReadPost readPost : readPosts) {
-                    readPostStrings.add(readPost.getId());
-                }
-                handler.post(() -> fetchPostFilterAndReadPostsListener.success(mergedPostFilter, readPostStrings));
-            }
+            handler.post(() -> fetchPostFilterListerner.success(mergedPostFilter));
         });
     }
 
@@ -85,4 +64,12 @@ public class FetchPostFilterReadPostsAndConcatenatedSubredditNames {
             }
         });
     }
+
+    public interface FetchPostFilterListerner {
+        void success(PostFilter postFilter);
+    }
+
+    public interface FetchPostFilterAndConcatenatecSubredditNamesListener {
+        void success(PostFilter postFilter, String concatenatedSubredditNames);
+    }
 }
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/AccountSavedThingActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/AccountSavedThingActivity.java
index 1c0c77b1..a6411ecb 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/AccountSavedThingActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/AccountSavedThingActivity.java
@@ -19,6 +19,7 @@ import androidx.viewpager2.widget.ViewPager2;
 
 import com.google.android.material.tabs.TabLayoutMediator;
 
+import ml.docilealligator.infinityforreddit.readpost.ReadPostsUtils;
 import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
 
@@ -58,6 +59,9 @@ public class AccountSavedThingActivity extends BaseActivity implements ActivityT
     @Named("default")
     SharedPreferences mSharedPreferences;
     @Inject
+    @Named("post_history")
+    SharedPreferences mPostHistorySharedPreferences;
+    @Inject
     @Named("post_layout")
     SharedPreferences mPostLayoutSharedPreferences;
     @Inject
@@ -251,7 +255,8 @@ public class AccountSavedThingActivity extends BaseActivity implements ActivityT
 
     @Override
     public void markPostAsRead(Post post) {
-        InsertReadPost.insertReadPost(mRedditDataRoomDatabase, mExecutor, accountName, post.getId());
+        int readPostsLimit = ReadPostsUtils.GetReadPostsLimit(accountName, mPostHistorySharedPreferences);
+        InsertReadPost.insertReadPost(mRedditDataRoomDatabase, mExecutor, accountName, post.getId(), readPostsLimit);
     }
 
     private class SectionsPagerAdapter extends FragmentStateAdapter {
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/FilteredPostsActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/FilteredPostsActivity.java
index dd8ff575..02ddae35 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/FilteredPostsActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/FilteredPostsActivity.java
@@ -15,6 +15,7 @@ import androidx.annotation.Nullable;
 import androidx.coordinatorlayout.widget.CoordinatorLayout;
 import androidx.lifecycle.ViewModelProvider;
 
+import ml.docilealligator.infinityforreddit.readpost.ReadPostsUtils;
 import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
 
@@ -73,6 +74,9 @@ public class FilteredPostsActivity extends BaseActivity implements SortTypeSelec
     @Named("default")
     SharedPreferences mSharedPreferences;
     @Inject
+    @Named("post_history")
+    SharedPreferences mPostHistorySharedPreferences;
+    @Inject
     @Named("post_layout")
     SharedPreferences mPostLayoutSharedPreferences;
     @Inject
@@ -459,7 +463,8 @@ public class FilteredPostsActivity extends BaseActivity implements SortTypeSelec
 
     @Override
     public void markPostAsRead(Post post) {
-        InsertReadPost.insertReadPost(mRedditDataRoomDatabase, mExecutor, accountName, post.getId());
+        int readPostsLimit = ReadPostsUtils.GetReadPostsLimit(accountName, mPostHistorySharedPreferences);
+        InsertReadPost.insertReadPost(mRedditDataRoomDatabase, mExecutor, accountName, post.getId(), readPostsLimit);
     }
 
     @Override
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/MainActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/MainActivity.java
index 045394ce..d86b862f 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/MainActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/MainActivity.java
@@ -52,6 +52,7 @@ import com.google.android.material.tabs.TabLayout;
 import com.google.android.material.tabs.TabLayoutMediator;
 import com.google.android.material.textfield.TextInputEditText;
 
+import ml.docilealligator.infinityforreddit.readpost.ReadPostsUtils;
 import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
 import org.greenrobot.eventbus.ThreadMode;
@@ -154,6 +155,9 @@ public class MainActivity extends BaseActivity implements SortTypeSelectionCallb
     @Named("sort_type")
     SharedPreferences mSortTypeSharedPreferences;
     @Inject
+    @Named("post_history")
+    SharedPreferences mPostHistorySharedPreferences;
+    @Inject
     @Named("post_layout")
     SharedPreferences mPostLayoutSharedPreferences;
     @Inject
@@ -1598,7 +1602,8 @@ public class MainActivity extends BaseActivity implements SortTypeSelectionCallb
 
     @Override
     public void markPostAsRead(Post post) {
-        InsertReadPost.insertReadPost(mRedditDataRoomDatabase, mExecutor, accountName, post.getId());
+        int readPostsLimit = ReadPostsUtils.GetReadPostsLimit(accountName, mPostHistorySharedPreferences);
+        InsertReadPost.insertReadPost(mRedditDataRoomDatabase, mExecutor, accountName, post.getId(), readPostsLimit);
     }
 
     public void doNotShowRedditAPIInfoAgain() {
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewMultiRedditDetailActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewMultiRedditDetailActivity.java
index 8d842ecf..4d0320bd 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewMultiRedditDetailActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewMultiRedditDetailActivity.java
@@ -25,6 +25,7 @@ import androidx.recyclerview.widget.RecyclerView;
 import com.google.android.material.dialog.MaterialAlertDialogBuilder;
 import com.google.android.material.textfield.TextInputEditText;
 
+import ml.docilealligator.infinityforreddit.readpost.ReadPostsUtils;
 import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
 
@@ -99,6 +100,9 @@ public class ViewMultiRedditDetailActivity extends BaseActivity implements SortT
     @Named("sort_type")
     SharedPreferences mSortTypeSharedPreferences;
     @Inject
+    @Named("post_history")
+    SharedPreferences mPostHistorySharedPreferences;
+    @Inject
     @Named("post_layout")
     SharedPreferences mPostLayoutSharedPreferences;
     @Inject
@@ -878,7 +882,8 @@ public class ViewMultiRedditDetailActivity extends BaseActivity implements SortT
 
     @Override
     public void markPostAsRead(Post post) {
-        InsertReadPost.insertReadPost(mRedditDataRoomDatabase, mExecutor, accountName, post.getId());
+        int readPostsLimit = ReadPostsUtils.GetReadPostsLimit(accountName, mPostHistorySharedPreferences);
+        InsertReadPost.insertReadPost(mRedditDataRoomDatabase, mExecutor, accountName, post.getId(), readPostsLimit);
     }
 
     @Override
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewPostDetailActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewPostDetailActivity.java
index 1e64bf89..9b5a65ae 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewPostDetailActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewPostDetailActivity.java
@@ -51,12 +51,8 @@ import javax.inject.Inject;
 import javax.inject.Named;
 
 import ml.docilealligator.infinityforreddit.Infinity;
-import ml.docilealligator.infinityforreddit.post.LoadingMorePostsStatus;
 import ml.docilealligator.infinityforreddit.R;
 import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
-import ml.docilealligator.infinityforreddit.thing.SaveThing;
-import ml.docilealligator.infinityforreddit.thing.SortType;
-import ml.docilealligator.infinityforreddit.thing.SortTypeSelectionCallback;
 import ml.docilealligator.infinityforreddit.account.Account;
 import ml.docilealligator.infinityforreddit.apis.RedditAPI;
 import ml.docilealligator.infinityforreddit.asynctasks.AccountManagement;
@@ -70,11 +66,17 @@ import ml.docilealligator.infinityforreddit.events.SwitchAccountEvent;
 import ml.docilealligator.infinityforreddit.fragments.MorePostsInfoFragment;
 import ml.docilealligator.infinityforreddit.fragments.ViewPostDetailFragment;
 import ml.docilealligator.infinityforreddit.post.HistoryPostPagingSource;
+import ml.docilealligator.infinityforreddit.post.LoadingMorePostsStatus;
 import ml.docilealligator.infinityforreddit.post.ParsePost;
 import ml.docilealligator.infinityforreddit.post.Post;
 import ml.docilealligator.infinityforreddit.post.PostPagingSource;
 import ml.docilealligator.infinityforreddit.postfilter.PostFilter;
+import ml.docilealligator.infinityforreddit.readpost.NullReadPostsList;
 import ml.docilealligator.infinityforreddit.readpost.ReadPost;
+import ml.docilealligator.infinityforreddit.readpost.ReadPostsListInterface;
+import ml.docilealligator.infinityforreddit.thing.SaveThing;
+import ml.docilealligator.infinityforreddit.thing.SortType;
+import ml.docilealligator.infinityforreddit.thing.SortTypeSelectionCallback;
 import ml.docilealligator.infinityforreddit.utils.APIUtils;
 import ml.docilealligator.infinityforreddit.utils.SharedPreferencesUtils;
 import retrofit2.Call;
@@ -141,8 +143,6 @@ public class ViewPostDetailActivity extends BaseActivity implements SortTypeSele
     @State
     SortType.Time sortTime;
     @State
-    ArrayList<String> readPostList;
-    @State
     Post post;
     @State
     @LoadingMorePostsStatus
@@ -156,6 +156,8 @@ public class ViewPostDetailActivity extends BaseActivity implements SortTypeSele
     private boolean mVolumeKeysNavigateComments;
     private boolean isNsfwSubreddit;
     private ActivityViewPostDetailBinding binding;
+    @Nullable
+    private ReadPostsListInterface readPostsList;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -581,7 +583,7 @@ public class ViewPostDetailActivity extends BaseActivity implements SortTypeSele
                     Response<String> response = call.execute();
                     if (response.isSuccessful()) {
                         String responseString = response.body();
-                        LinkedHashSet<Post> newPosts = ParsePost.parsePostsSync(responseString, -1, postFilter, readPostList);
+                        LinkedHashSet<Post> newPosts = ParsePost.parsePostsSync(responseString, -1, postFilter, readPostsList);
                         if (newPosts == null) {
                             handler.post(() -> {
                                 loadingMorePostsStatus = LoadingMorePostsStatus.NO_MORE_POSTS;
@@ -663,7 +665,7 @@ public class ViewPostDetailActivity extends BaseActivity implements SortTypeSele
                     Response<String> response = historyPosts.execute();
                     if (response.isSuccessful()) {
                         String responseString = response.body();
-                        LinkedHashSet<Post> newPosts = ParsePost.parsePostsSync(responseString, -1, postFilter, null);
+                        LinkedHashSet<Post> newPosts = ParsePost.parsePostsSync(responseString, -1, postFilter, NullReadPostsList.getInstance());
                         if (newPosts == null || newPosts.isEmpty()) {
                             handler.post(() -> {
                                 loadingMorePostsStatus = LoadingMorePostsStatus.NO_MORE_POSTS;
@@ -744,7 +746,7 @@ public class ViewPostDetailActivity extends BaseActivity implements SortTypeSele
             this.postFilter = event.postFilter;
             this.sortType = event.sortType.getType();
             this.sortTime = event.sortType.getTime();
-            this.readPostList = event.readPostList;
+            this.readPostsList = event.readPostsList;
 
             if (sectionsPagerAdapter != null) {
                 if (postListPosition > 0)
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewSubredditDetailActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewSubredditDetailActivity.java
index 9b20c311..af86bda3 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewSubredditDetailActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewSubredditDetailActivity.java
@@ -48,6 +48,7 @@ import com.google.android.material.snackbar.Snackbar;
 import com.google.android.material.tabs.TabLayoutMediator;
 import com.google.android.material.textfield.TextInputEditText;
 
+import ml.docilealligator.infinityforreddit.readpost.ReadPostsUtils;
 import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
 
@@ -151,6 +152,9 @@ public class ViewSubredditDetailActivity extends BaseActivity implements SortTyp
     @Inject
     @Named("nsfw_and_spoiler")
     SharedPreferences mNsfwAndSpoilerSharedPreferences;
+    @Inject()
+    @Named("post_history")
+    SharedPreferences mPostHistorySharedPreferences;
     @Inject
     @Named("post_layout")
     SharedPreferences mPostLayoutSharedPreferences;
@@ -1537,7 +1541,8 @@ public class ViewSubredditDetailActivity extends BaseActivity implements SortTyp
 
     @Override
     public void markPostAsRead(Post post) {
-        InsertReadPost.insertReadPost(mRedditDataRoomDatabase, mExecutor, accountName, post.getId());
+        int readPostsLimit = ReadPostsUtils.GetReadPostsLimit(accountName, mPostHistorySharedPreferences);
+        InsertReadPost.insertReadPost(mRedditDataRoomDatabase, mExecutor, accountName, post.getId(), readPostsLimit);
     }
 
     @Override
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewUserDetailActivity.java b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewUserDetailActivity.java
index cad5c906..379da366 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewUserDetailActivity.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewUserDetailActivity.java
@@ -44,6 +44,7 @@ import com.google.android.material.snackbar.Snackbar;
 import com.google.android.material.tabs.TabLayoutMediator;
 import com.google.android.material.textfield.TextInputEditText;
 
+import ml.docilealligator.infinityforreddit.readpost.ReadPostsUtils;
 import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
 
@@ -147,6 +148,9 @@ public class ViewUserDetailActivity extends BaseActivity implements SortTypeSele
     @Named("sort_type")
     SharedPreferences mSortTypeSharedPreferences;
     @Inject
+    @Named("post_history")
+    SharedPreferences mPostHistorySharedPreferences;
+    @Inject
     @Named("post_layout")
     SharedPreferences mPostLayoutSharedPreferences;
     @Inject
@@ -1550,7 +1554,8 @@ public class ViewUserDetailActivity extends BaseActivity implements SortTypeSele
 
     @Override
     public void markPostAsRead(Post post) {
-        InsertReadPost.insertReadPost(mRedditDataRoomDatabase, mExecutor, accountName, post.getId());
+        int readPostsLimit = ReadPostsUtils.GetReadPostsLimit(accountName, mPostHistorySharedPreferences);
+        InsertReadPost.insertReadPost(mRedditDataRoomDatabase, mExecutor, accountName, post.getId(), readPostsLimit);
     }
 
     @Override
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/events/ProvidePostListToViewPostDetailActivityEvent.java b/app/src/main/java/ml/docilealligator/infinityforreddit/events/ProvidePostListToViewPostDetailActivityEvent.java
index e387c27d..bf8dc974 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/events/ProvidePostListToViewPostDetailActivityEvent.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/events/ProvidePostListToViewPostDetailActivityEvent.java
@@ -2,6 +2,7 @@ package ml.docilealligator.infinityforreddit.events;
 
 import java.util.ArrayList;
 
+import ml.docilealligator.infinityforreddit.readpost.ReadPostsListInterface;
 import ml.docilealligator.infinityforreddit.thing.SortType;
 import ml.docilealligator.infinityforreddit.post.Post;
 import ml.docilealligator.infinityforreddit.postfilter.PostFilter;
@@ -19,14 +20,13 @@ public class ProvidePostListToViewPostDetailActivityEvent {
     public String trendingSource;
     public PostFilter postFilter;
     public SortType sortType;
-    public ArrayList<String> readPostList;
+    public ReadPostsListInterface readPostsList;
 
     public ProvidePostListToViewPostDetailActivityEvent(long postFragmentId, ArrayList<Post> posts, int postType,
                                                         String subredditName, String concatenatedSubredditNames,
                                                         String username, String userWhere,
                                                         String multiPath, String query, String trendingSource,
-                                                        PostFilter postFilter, SortType sortType,
-                                                        ArrayList<String> readPostList) {
+                                                        PostFilter postFilter, SortType sortType, ReadPostsListInterface readPostsList) {
         this.postFragmentId = postFragmentId;
         this.posts = posts;
         this.postType = postType;
@@ -39,6 +39,6 @@ public class ProvidePostListToViewPostDetailActivityEvent {
         this.trendingSource = trendingSource;
         this.postFilter = postFilter;
         this.sortType = sortType;
-        this.readPostList = readPostList;
+        this.readPostsList = readPostsList;
     }
 }
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/HistoryPostFragment.java b/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/HistoryPostFragment.java
index 3ea7ae13..fd21e73a 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/HistoryPostFragment.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/HistoryPostFragment.java
@@ -37,7 +37,7 @@ import javax.inject.Inject;
 import javax.inject.Named;
 import javax.inject.Provider;
 
-import ml.docilealligator.infinityforreddit.FetchPostFilterReadPostsAndConcatenatedSubredditNames;
+import ml.docilealligator.infinityforreddit.FetchPostFilterAndConcatenatedSubredditNames;
 import ml.docilealligator.infinityforreddit.Infinity;
 import ml.docilealligator.infinityforreddit.R;
 import ml.docilealligator.infinityforreddit.RecyclerViewContentScrollingInterface;
@@ -112,7 +112,6 @@ public class HistoryPostFragment extends PostFragmentBase implements FragmentCom
     private PostRecyclerViewAdapter mAdapter;
     private int maxPosition = -1;
     private PostFilter postFilter;
-    private ArrayList<String> readPosts;
     private int historyType;
     private FragmentHistoryPostBinding binding;
 
@@ -163,7 +162,6 @@ public class HistoryPostFragment extends PostFragmentBase implements FragmentCom
             recyclerViewPosition = savedInstanceState.getInt(RECYCLER_VIEW_POSITION_STATE);
 
             isInLazyMode = savedInstanceState.getBoolean(IS_IN_LAZY_MODE_STATE);
-            readPosts = savedInstanceState.getStringArrayList(READ_POST_LIST_STATE);
             postFilter = savedInstanceState.getParcelable(POST_FILTER_STATE);
             postFragmentId = savedInstanceState.getLong(POST_FRAGMENT_ID_STATE);
         } else {
@@ -264,8 +262,8 @@ public class HistoryPostFragment extends PostFragmentBase implements FragmentCom
         }
 
         if (postFilter == null) {
-            FetchPostFilterReadPostsAndConcatenatedSubredditNames.fetchPostFilterAndReadPosts(mRedditDataRoomDatabase, mExecutor,
-                    new Handler(), activity.accountName, PostFilterUsage.HISTORY_TYPE, PostFilterUsage.HISTORY_TYPE_USAGE_READ_POSTS, (postFilter, readPostList) -> {
+            FetchPostFilterAndConcatenatedSubredditNames.fetchPostFilter(mRedditDataRoomDatabase, mExecutor,
+                    new Handler(), PostFilterUsage.HISTORY_TYPE, PostFilterUsage.HISTORY_TYPE_USAGE_READ_POSTS, (postFilter) -> {
                         if (activity != null && !activity.isFinishing() && !activity.isDestroyed() && !isDetached()) {
                             this.postFilter = postFilter;
                             postFilter.allowNSFW = !mSharedPreferences.getBoolean(SharedPreferencesUtils.DISABLE_NSFW_FOREVER, false) && mNsfwAndSpoilerSharedPreferences.getBoolean(activity.accountName + SharedPreferencesUtils.NSFW_BASE, false);
@@ -402,7 +400,6 @@ public class HistoryPostFragment extends PostFragmentBase implements FragmentCom
     public void onSaveInstanceState(@NonNull Bundle outState) {
         super.onSaveInstanceState(outState);
         outState.putBoolean(IS_IN_LAZY_MODE_STATE, isInLazyMode);
-        outState.putStringArrayList(READ_POST_LIST_STATE, readPosts);
         if (mLinearLayoutManager != null) {
             outState.putInt(RECYCLER_VIEW_POSITION_STATE, mLinearLayoutManager.findFirstVisibleItemPosition());
         } else if (mStaggeredGridLayoutManager != null) {
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/PostFragment.java b/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/PostFragment.java
index 69ea35d0..a3d0dab9 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/PostFragment.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/PostFragment.java
@@ -40,7 +40,7 @@ import javax.inject.Inject;
 import javax.inject.Named;
 import javax.inject.Provider;
 
-import ml.docilealligator.infinityforreddit.FetchPostFilterReadPostsAndConcatenatedSubredditNames;
+import ml.docilealligator.infinityforreddit.FetchPostFilterAndConcatenatedSubredditNames;
 import ml.docilealligator.infinityforreddit.Infinity;
 import ml.docilealligator.infinityforreddit.R;
 import ml.docilealligator.infinityforreddit.RecyclerViewContentScrollingInterface;
@@ -68,6 +68,10 @@ import ml.docilealligator.infinityforreddit.post.PostPagingSource;
 import ml.docilealligator.infinityforreddit.post.PostViewModel;
 import ml.docilealligator.infinityforreddit.postfilter.PostFilter;
 import ml.docilealligator.infinityforreddit.postfilter.PostFilterUsage;
+import ml.docilealligator.infinityforreddit.readpost.InsertReadPost;
+import ml.docilealligator.infinityforreddit.readpost.ReadPostsList;
+import ml.docilealligator.infinityforreddit.readpost.ReadPostsListInterface;
+import ml.docilealligator.infinityforreddit.readpost.ReadPostsUtils;
 import ml.docilealligator.infinityforreddit.thing.SortType;
 import ml.docilealligator.infinityforreddit.utils.SharedPreferencesUtils;
 import ml.docilealligator.infinityforreddit.utils.Utils;
@@ -93,7 +97,6 @@ public class PostFragment extends PostFragmentBase implements FragmentCommunicat
 
     private static final String IS_IN_LAZY_MODE_STATE = "IILMS";
     private static final String RECYCLER_VIEW_POSITION_STATE = "RVPS";
-    private static final String READ_POST_LIST_STATE = "RPLS";
     private static final String POST_FILTER_STATE = "PFS";
     private static final String CONCATENATED_SUBREDDIT_NAMES_STATE = "CSNS";
     private static final String POST_FRAGMENT_ID_STATE = "PFIS";
@@ -137,7 +140,7 @@ public class PostFragment extends PostFragmentBase implements FragmentCommunicat
     private int maxPosition = -1;
     private SortType sortType;
     private PostFilter postFilter;
-    private ArrayList<String> readPosts;
+    private ReadPostsListInterface readPostsList;
     private FragmentPostBinding binding;
 
     public PostFragment() {
@@ -206,7 +209,6 @@ public class PostFragment extends PostFragmentBase implements FragmentCommunicat
             recyclerViewPosition = savedInstanceState.getInt(RECYCLER_VIEW_POSITION_STATE);
 
             isInLazyMode = savedInstanceState.getBoolean(IS_IN_LAZY_MODE_STATE);
-            readPosts = savedInstanceState.getStringArrayList(READ_POST_LIST_STATE);
             postFilter = savedInstanceState.getParcelable(POST_FILTER_STATE);
             concatenatedSubredditNames = savedInstanceState.getString(CONCATENATED_SUBREDDIT_NAMES_STATE);
             postFragmentId = savedInstanceState.getLong(POST_FRAGMENT_ID_STATE);
@@ -215,6 +217,9 @@ public class PostFragment extends PostFragmentBase implements FragmentCommunicat
             postFragmentId = System.currentTimeMillis() + new Random().nextInt(1000);
         }
 
+        readPostsList = new ReadPostsList(mRedditDataRoomDatabase.readPostDao(), activity.accountName,
+                getArguments().getBoolean(EXTRA_DISABLE_READ_POSTS, false));
+
         binding.recyclerViewPostFragment.setOnTouchListener((view, motionEvent) -> {
             if (isInLazyMode) {
                 pauseLazyMode(true);
@@ -719,56 +724,27 @@ public class PostFragment extends PostFragmentBase implements FragmentCommunicat
         }
 
         if (!activity.accountName.equals(Account.ANONYMOUS_ACCOUNT)) {
-            if (mPostHistorySharedPreferences.getBoolean(activity.accountName + SharedPreferencesUtils.MARK_POSTS_AS_READ_BASE, false) && readPosts == null) {
-                if (getArguments().getBoolean(EXTRA_DISABLE_READ_POSTS, false)) {
-                    if (postFilter == null) {
-                        FetchPostFilterReadPostsAndConcatenatedSubredditNames.fetchPostFilterAndReadPosts(mRedditDataRoomDatabase, mExecutor,
-                                new Handler(), activity.accountName, usage, nameOfUsage, (postFilter, readPostList) -> {
-                                    if (activity != null && !activity.isFinishing() && !activity.isDestroyed() && !isDetached()) {
-                                        this.postFilter = postFilter;
-                                        postFilter.allowNSFW = !mSharedPreferences.getBoolean(SharedPreferencesUtils.DISABLE_NSFW_FOREVER, false) && mNsfwAndSpoilerSharedPreferences.getBoolean(activity.accountName + SharedPreferencesUtils.NSFW_BASE, false);
-                                        initializeAndBindPostViewModel();
-                                    }
-                                });
-                    } else {
-                        initializeAndBindPostViewModel();
-                    }
-                } else {
-                    FetchPostFilterReadPostsAndConcatenatedSubredditNames.fetchPostFilterAndReadPosts(mRedditDataRoomDatabase, mExecutor,
-                            new Handler(), activity.accountName, usage, nameOfUsage, (postFilter, readPostList) -> {
-                                if (activity != null && !activity.isFinishing() && !activity.isDestroyed() && !isDetached()) {
-                                    if (this.postFilter == null) {
-                                        this.postFilter = postFilter;
-                                        postFilter.allowNSFW = !mSharedPreferences.getBoolean(SharedPreferencesUtils.DISABLE_NSFW_FOREVER, false) && mNsfwAndSpoilerSharedPreferences.getBoolean(activity.accountName + SharedPreferencesUtils.NSFW_BASE, false);
-                                    }
-                                    this.readPosts = readPostList;
-                                    initializeAndBindPostViewModel();
-                                }
-                            });
-                }
+            if (postFilter == null) {
+                FetchPostFilterAndConcatenatedSubredditNames.fetchPostFilter(mRedditDataRoomDatabase, mExecutor,
+                        new Handler(), usage, nameOfUsage, (postFilter) -> {
+                            if (activity != null && !activity.isFinishing() && !activity.isDestroyed() && !isDetached()) {
+                                this.postFilter = postFilter;
+                                this.postFilter.allowNSFW = !mSharedPreferences.getBoolean(SharedPreferencesUtils.DISABLE_NSFW_FOREVER, false) && mNsfwAndSpoilerSharedPreferences.getBoolean(activity.accountName + SharedPreferencesUtils.NSFW_BASE, false);
+                                initializeAndBindPostViewModel();
+                            }
+                        });
             } else {
-                if (postFilter == null) {
-                    FetchPostFilterReadPostsAndConcatenatedSubredditNames.fetchPostFilterAndReadPosts(mRedditDataRoomDatabase, mExecutor,
-                            new Handler(), activity.accountName, usage, nameOfUsage, (postFilter, readPostList) -> {
-                                if (activity != null && !activity.isFinishing() && !activity.isDestroyed() && !isDetached()) {
-                                    this.postFilter = postFilter;
-                                    postFilter.allowNSFW = !mSharedPreferences.getBoolean(SharedPreferencesUtils.DISABLE_NSFW_FOREVER, false) && mNsfwAndSpoilerSharedPreferences.getBoolean(activity.accountName + SharedPreferencesUtils.NSFW_BASE, false);
-                                    initializeAndBindPostViewModel();
-                                }
-                            });
-                } else {
-                    initializeAndBindPostViewModel();
-                }
+                initializeAndBindPostViewModel();
             }
         } else {
             if (postFilter == null) {
                 if (postType == PostPagingSource.TYPE_ANONYMOUS_FRONT_PAGE) {
                     if (concatenatedSubredditNames == null) {
-                        FetchPostFilterReadPostsAndConcatenatedSubredditNames.fetchPostFilterAndConcatenatedSubredditNames(mRedditDataRoomDatabase, mExecutor, new Handler(), usage, nameOfUsage,
+                        FetchPostFilterAndConcatenatedSubredditNames.fetchPostFilterAndConcatenatedSubredditNames(mRedditDataRoomDatabase, mExecutor, new Handler(), usage, nameOfUsage,
                                 (postFilter, concatenatedSubredditNames) -> {
                                     if (activity != null && !activity.isFinishing() && !activity.isDestroyed() && !isDetached()) {
                                         this.postFilter = postFilter;
-                                        postFilter.allowNSFW = !mSharedPreferences.getBoolean(SharedPreferencesUtils.DISABLE_NSFW_FOREVER, false) && mNsfwAndSpoilerSharedPreferences.getBoolean(SharedPreferencesUtils.NSFW_BASE, false);
+                                        this.postFilter.allowNSFW = !mSharedPreferences.getBoolean(SharedPreferencesUtils.DISABLE_NSFW_FOREVER, false) && mNsfwAndSpoilerSharedPreferences.getBoolean(SharedPreferencesUtils.NSFW_BASE, false);
                                         this.concatenatedSubredditNames = concatenatedSubredditNames;
                                         if (concatenatedSubredditNames == null) {
                                             showErrorView(R.string.anonymous_front_page_no_subscriptions);
@@ -782,11 +758,11 @@ public class PostFragment extends PostFragmentBase implements FragmentCommunicat
                     }
                 } else if (postType == PostPagingSource.TYPE_ANONYMOUS_MULTIREDDIT) {
                     if (concatenatedSubredditNames == null) {
-                        FetchPostFilterReadPostsAndConcatenatedSubredditNames.fetchPostFilterAndConcatenatedSubredditNames(mRedditDataRoomDatabase, mExecutor, new Handler(), multiRedditPath, usage, nameOfUsage,
+                        FetchPostFilterAndConcatenatedSubredditNames.fetchPostFilterAndConcatenatedSubredditNames(mRedditDataRoomDatabase, mExecutor, new Handler(), multiRedditPath, usage, nameOfUsage,
                                 (postFilter, concatenatedSubredditNames) -> {
                                     if (activity != null && !activity.isFinishing() && !activity.isDestroyed() && !isDetached()) {
                                         this.postFilter = postFilter;
-                                        postFilter.allowNSFW = !mSharedPreferences.getBoolean(SharedPreferencesUtils.DISABLE_NSFW_FOREVER, false) && mNsfwAndSpoilerSharedPreferences.getBoolean(SharedPreferencesUtils.NSFW_BASE, false);
+                                        this.postFilter.allowNSFW = !mSharedPreferences.getBoolean(SharedPreferencesUtils.DISABLE_NSFW_FOREVER, false) && mNsfwAndSpoilerSharedPreferences.getBoolean(SharedPreferencesUtils.NSFW_BASE, false);
                                         this.concatenatedSubredditNames = concatenatedSubredditNames;
                                         if (concatenatedSubredditNames == null) {
                                             showErrorView(R.string.anonymous_multireddit_no_subreddit);
@@ -799,11 +775,11 @@ public class PostFragment extends PostFragmentBase implements FragmentCommunicat
                         initializeAndBindPostViewModelForAnonymous(concatenatedSubredditNames);
                     }
                 } else {
-                    FetchPostFilterReadPostsAndConcatenatedSubredditNames.fetchPostFilterAndReadPosts(mRedditDataRoomDatabase, mExecutor,
-                            new Handler(), activity.accountName, usage, nameOfUsage, (postFilter, readPostList) -> {
+                    FetchPostFilterAndConcatenatedSubredditNames.fetchPostFilter(mRedditDataRoomDatabase, mExecutor,
+                            new Handler(), usage, nameOfUsage, (postFilter) -> {
                                 if (activity != null && !activity.isFinishing() && !activity.isDestroyed() && !isDetached()) {
                                     this.postFilter = postFilter;
-                                    postFilter.allowNSFW = !mSharedPreferences.getBoolean(SharedPreferencesUtils.DISABLE_NSFW_FOREVER, false) && mNsfwAndSpoilerSharedPreferences.getBoolean(SharedPreferencesUtils.NSFW_BASE, false);
+                                    this.postFilter.allowNSFW = !mSharedPreferences.getBoolean(SharedPreferencesUtils.DISABLE_NSFW_FOREVER, false) && mNsfwAndSpoilerSharedPreferences.getBoolean(SharedPreferencesUtils.NSFW_BASE, false);
                                     initializeAndBindPostViewModelForAnonymous(null);
                                 }
                             });
@@ -811,10 +787,10 @@ public class PostFragment extends PostFragmentBase implements FragmentCommunicat
             } else {
                 if (postType == PostPagingSource.TYPE_ANONYMOUS_FRONT_PAGE) {
                     if (concatenatedSubredditNames == null) {
-                        FetchPostFilterReadPostsAndConcatenatedSubredditNames.fetchPostFilterAndConcatenatedSubredditNames(mRedditDataRoomDatabase, mExecutor, new Handler(), usage, nameOfUsage,
+                        FetchPostFilterAndConcatenatedSubredditNames.fetchPostFilterAndConcatenatedSubredditNames(mRedditDataRoomDatabase, mExecutor, new Handler(), usage, nameOfUsage,
                                 (postFilter, concatenatedSubredditNames) -> {
                                     if (activity != null && !activity.isFinishing() && !activity.isDestroyed() && !isDetached()) {
-                                        postFilter.allowNSFW = !mSharedPreferences.getBoolean(SharedPreferencesUtils.DISABLE_NSFW_FOREVER, false) && mNsfwAndSpoilerSharedPreferences.getBoolean(SharedPreferencesUtils.NSFW_BASE, false);
+                                        this.postFilter.allowNSFW = !mSharedPreferences.getBoolean(SharedPreferencesUtils.DISABLE_NSFW_FOREVER, false) && mNsfwAndSpoilerSharedPreferences.getBoolean(SharedPreferencesUtils.NSFW_BASE, false);
                                         this.concatenatedSubredditNames = concatenatedSubredditNames;
                                         if (concatenatedSubredditNames == null) {
                                             showErrorView(R.string.anonymous_front_page_no_subscriptions);
@@ -828,10 +804,10 @@ public class PostFragment extends PostFragmentBase implements FragmentCommunicat
                     }
                 } else if (postType == PostPagingSource.TYPE_ANONYMOUS_MULTIREDDIT) {
                     if (concatenatedSubredditNames == null) {
-                        FetchPostFilterReadPostsAndConcatenatedSubredditNames.fetchPostFilterAndConcatenatedSubredditNames(mRedditDataRoomDatabase, mExecutor, new Handler(), multiRedditPath, usage, nameOfUsage,
+                        FetchPostFilterAndConcatenatedSubredditNames.fetchPostFilterAndConcatenatedSubredditNames(mRedditDataRoomDatabase, mExecutor, new Handler(), multiRedditPath, usage, nameOfUsage,
                                 (postFilter, concatenatedSubredditNames) -> {
                                     if (activity != null && !activity.isFinishing() && !activity.isDestroyed() && !isDetached()) {
-                                        postFilter.allowNSFW = !mSharedPreferences.getBoolean(SharedPreferencesUtils.DISABLE_NSFW_FOREVER, false) && mNsfwAndSpoilerSharedPreferences.getBoolean(SharedPreferencesUtils.NSFW_BASE, false);
+                                        this.postFilter.allowNSFW = !mSharedPreferences.getBoolean(SharedPreferencesUtils.DISABLE_NSFW_FOREVER, false) && mNsfwAndSpoilerSharedPreferences.getBoolean(SharedPreferencesUtils.NSFW_BASE, false);
                                         this.concatenatedSubredditNames = concatenatedSubredditNames;
                                         if (concatenatedSubredditNames == null) {
                                             showErrorView(R.string.anonymous_multireddit_no_subreddit);
@@ -967,27 +943,27 @@ public class PostFragment extends PostFragmentBase implements FragmentCommunicat
             mPostViewModel = new ViewModelProvider(PostFragment.this, new PostViewModel.Factory(mExecutor,
                     activity.accountName.equals(Account.ANONYMOUS_ACCOUNT) ? mRetrofit : mOauthRetrofit, activity.accessToken, activity.accountName, mSharedPreferences,
                     mPostFeedScrolledPositionSharedPreferences, mPostHistorySharedPreferences, subredditName,
-                    query, trendingSource, postType, sortType, postFilter, readPosts)).get(PostViewModel.class);
+                    query, trendingSource, postType, sortType, postFilter, readPostsList)).get(PostViewModel.class);
         } else if (postType == PostPagingSource.TYPE_SUBREDDIT) {
             mPostViewModel = new ViewModelProvider(PostFragment.this, new PostViewModel.Factory(mExecutor,
                     activity.accountName.equals(Account.ANONYMOUS_ACCOUNT) ? mRetrofit : mOauthRetrofit, activity.accessToken, activity.accountName, mSharedPreferences, mPostFeedScrolledPositionSharedPreferences,
-                    mPostHistorySharedPreferences, subredditName, postType, sortType, postFilter, readPosts))
+                    mPostHistorySharedPreferences, subredditName, postType, sortType, postFilter, readPostsList))
                     .get(PostViewModel.class);
         } else if (postType == PostPagingSource.TYPE_MULTI_REDDIT) {
             mPostViewModel = new ViewModelProvider(PostFragment.this, new PostViewModel.Factory(mExecutor,
                     activity.accountName.equals(Account.ANONYMOUS_ACCOUNT) ? mRetrofit : mOauthRetrofit, activity.accessToken, activity.accountName, mSharedPreferences, mPostFeedScrolledPositionSharedPreferences,
-                    mPostHistorySharedPreferences, multiRedditPath, query, postType, sortType, postFilter, readPosts))
+                    mPostHistorySharedPreferences, multiRedditPath, query, postType, sortType, postFilter, readPostsList))
                     .get(PostViewModel.class);
         } else if (postType == PostPagingSource.TYPE_USER) {
             mPostViewModel = new ViewModelProvider(PostFragment.this, new PostViewModel.Factory(mExecutor,
                     activity.accountName.equals(Account.ANONYMOUS_ACCOUNT) ? mRetrofit : mOauthRetrofit, activity.accessToken, activity.accountName, mSharedPreferences, mPostFeedScrolledPositionSharedPreferences,
-                    mPostHistorySharedPreferences, username, postType, sortType, postFilter, where, readPosts))
+                    mPostHistorySharedPreferences, username, postType, sortType, postFilter, where, readPostsList))
                     .get(PostViewModel.class);
         } else {
             mPostViewModel = new ViewModelProvider(PostFragment.this, new PostViewModel.Factory(mExecutor,
                     mOauthRetrofit, activity.accessToken,
                     activity.accountName, mSharedPreferences, mPostFeedScrolledPositionSharedPreferences,
-                    mPostHistorySharedPreferences, postType, sortType, postFilter, readPosts)).get(PostViewModel.class);
+                    mPostHistorySharedPreferences, postType, sortType, postFilter, readPostsList)).get(PostViewModel.class);
         }
 
         bindPostViewModel();
@@ -998,21 +974,21 @@ public class PostFragment extends PostFragmentBase implements FragmentCommunicat
             mPostViewModel = new ViewModelProvider(PostFragment.this, new PostViewModel.Factory(mExecutor,
                     mRetrofit, null, activity.accountName, mSharedPreferences,
                     mPostFeedScrolledPositionSharedPreferences, null, subredditName, query, trendingSource,
-                    postType, sortType, postFilter, readPosts)).get(PostViewModel.class);
+                    postType, sortType, postFilter, readPostsList)).get(PostViewModel.class);
         } else if (postType == PostPagingSource.TYPE_SUBREDDIT) {
             mPostViewModel = new ViewModelProvider(this, new PostViewModel.Factory(mExecutor,
                     mRetrofit, null, activity.accountName, mSharedPreferences,
                     mPostFeedScrolledPositionSharedPreferences, null, subredditName, postType, sortType,
-                    postFilter, readPosts)).get(PostViewModel.class);
+                    postFilter, readPostsList)).get(PostViewModel.class);
         } else if (postType == PostPagingSource.TYPE_USER) {
             mPostViewModel = new ViewModelProvider(PostFragment.this, new PostViewModel.Factory(mExecutor,
                     mRetrofit, null, activity.accountName, mSharedPreferences,
                     mPostFeedScrolledPositionSharedPreferences, null, username, postType, sortType, postFilter,
-                    where, readPosts)).get(PostViewModel.class);
+                    where, readPostsList)).get(PostViewModel.class);
         } else {
             //Anonymous front page or multireddit
             mPostViewModel = new ViewModelProvider(PostFragment.this, new PostViewModel.Factory(mExecutor,
-                    mRetrofit, mSharedPreferences, concatenatedSubredditNames, postType, sortType, postFilter))
+                    mRetrofit, mSharedPreferences, concatenatedSubredditNames, postType, sortType, postFilter, readPostsList))
                     .get(PostViewModel.class);
         }
 
@@ -1169,7 +1145,6 @@ public class PostFragment extends PostFragmentBase implements FragmentCommunicat
     public void onSaveInstanceState(@NonNull Bundle outState) {
         super.onSaveInstanceState(outState);
         outState.putBoolean(IS_IN_LAZY_MODE_STATE, isInLazyMode);
-        outState.putStringArrayList(READ_POST_LIST_STATE, readPosts);
         if (mLinearLayoutManager != null) {
             outState.putInt(RECYCLER_VIEW_POSITION_STATE, mLinearLayoutManager.findFirstVisibleItemPosition());
         } else if (mStaggeredGridLayoutManager != null) {
@@ -1390,10 +1365,8 @@ public class PostFragment extends PostFragmentBase implements FragmentCommunicat
 
     @Override
     public void markPostAsRead(Post post) {
-        if (readPosts == null) {
-            readPosts = new ArrayList<>();
-        }
-        readPosts.add(post.getId());
+        int readPostsLimit = ReadPostsUtils.GetReadPostsLimit(activity.accountName, mPostHistorySharedPreferences);
+        InsertReadPost.insertReadPost(mRedditDataRoomDatabase, mExecutor, activity.accountName, post.getId(), readPostsLimit);
     }
 
     @Subscribe
@@ -1462,7 +1435,7 @@ public class PostFragment extends PostFragmentBase implements FragmentCommunicat
             EventBus.getDefault().post(new ProvidePostListToViewPostDetailActivityEvent(postFragmentId,
                     new ArrayList<>(mAdapter.snapshot()), postType, subredditName,
                     concatenatedSubredditNames, username, where, multiRedditPath, query, trendingSource,
-                    postFilter, sortType, readPosts));
+                    postFilter, sortType, readPostsList));
         }
     }
 
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/ViewPostDetailFragment.java b/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/ViewPostDetailFragment.java
index d8f8b03d..66535d27 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/ViewPostDetailFragment.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/fragments/ViewPostDetailFragment.java
@@ -48,6 +48,7 @@ import com.evernote.android.state.State;
 import com.google.android.material.dialog.MaterialAlertDialogBuilder;
 import com.livefront.bridge.Bridge;
 
+import ml.docilealligator.infinityforreddit.readpost.ReadPostsUtils;
 import org.greenrobot.eventbus.EventBus;
 import org.greenrobot.eventbus.Subscribe;
 
@@ -1156,7 +1157,8 @@ public class ViewPostDetailFragment extends Fragment implements FragmentCommunic
     private void tryMarkingPostAsRead() {
         if (mMarkPostsAsRead && mPost != null && !mPost.isRead()) {
             mPost.markAsRead();
-            InsertReadPost.insertReadPost(mRedditDataRoomDatabase, mExecutor, activity.accountName, mPost.getId());
+            int readPostsLimit = ReadPostsUtils.GetReadPostsLimit(activity.accountName, mPostHistorySharedPreferences);
+            InsertReadPost.insertReadPost(mRedditDataRoomDatabase, mExecutor, activity.accountName, mPost.getId(), readPostsLimit);
             EventBus.getDefault().post(new PostUpdateEventToPostList(mPost, postListPosition));
         }
     }
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/post/HistoryPostPagingSource.java b/app/src/main/java/ml/docilealligator/infinityforreddit/post/HistoryPostPagingSource.java
index a0b9167f..5aad494a 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/post/HistoryPostPagingSource.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/post/HistoryPostPagingSource.java
@@ -20,6 +20,7 @@ import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
 import ml.docilealligator.infinityforreddit.account.Account;
 import ml.docilealligator.infinityforreddit.apis.RedditAPI;
 import ml.docilealligator.infinityforreddit.postfilter.PostFilter;
+import ml.docilealligator.infinityforreddit.readpost.NullReadPostsList;
 import ml.docilealligator.infinityforreddit.readpost.ReadPost;
 import ml.docilealligator.infinityforreddit.utils.APIUtils;
 import retrofit2.Call;
@@ -92,7 +93,7 @@ public class HistoryPostPagingSource extends ListenableFuturePagingSource<String
             Response<String> response = historyPosts.execute();
             if (response.isSuccessful()) {
                 String responseString = response.body();
-                LinkedHashSet<Post> newPosts = ParsePost.parsePostsSync(responseString, -1, postFilter, null);
+                LinkedHashSet<Post> newPosts = ParsePost.parsePostsSync(responseString, -1, postFilter, NullReadPostsList.getInstance());
                 if (newPosts == null) {
                     return new LoadResult.Error<>(new Exception("Error parsing posts"));
                 } else {
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/post/ParsePost.java b/app/src/main/java/ml/docilealligator/infinityforreddit/post/ParsePost.java
index 6092d9e1..88b6fc90 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/post/ParsePost.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/post/ParsePost.java
@@ -13,16 +13,16 @@ import org.json.JSONException;
 import org.json.JSONObject;
 
 import java.util.ArrayList;
-import java.util.HashSet;
 import java.util.LinkedHashSet;
-import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.concurrent.Executor;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
-import ml.docilealligator.infinityforreddit.thing.MediaMetadata;
 import ml.docilealligator.infinityforreddit.postfilter.PostFilter;
+import ml.docilealligator.infinityforreddit.readpost.ReadPostsListInterface;
+import ml.docilealligator.infinityforreddit.thing.MediaMetadata;
 import ml.docilealligator.infinityforreddit.utils.JSONUtils;
 import ml.docilealligator.infinityforreddit.utils.Utils;
 
@@ -31,41 +31,41 @@ import ml.docilealligator.infinityforreddit.utils.Utils;
  */
 
 public class ParsePost {
-    public static LinkedHashSet<Post> parsePostsSync(String response, int nPosts, PostFilter postFilter, List<String> readPostList) {
+    @WorkerThread
+    public static LinkedHashSet<Post> parsePostsSync(String response, int nPosts, PostFilter postFilter, @Nullable ReadPostsListInterface readPostsList) {
         LinkedHashSet<Post> newPosts = new LinkedHashSet<>();
         try {
             JSONObject jsonResponse = new JSONObject(response);
-            JSONArray allData = jsonResponse.getJSONObject(JSONUtils.DATA_KEY).getJSONArray(JSONUtils.CHILDREN_KEY);
+            JSONArray allPostsData = jsonResponse.getJSONObject(JSONUtils.DATA_KEY).getJSONArray(JSONUtils.CHILDREN_KEY);
 
             //Posts listing
-            int size;
-            if (nPosts < 0 || nPosts > allData.length()) {
-                size = allData.length();
-            } else {
-                size = nPosts;
-            }
+            int numberOfPosts = (nPosts < 0 || nPosts > allPostsData.length()) ?
+                    allPostsData.length() : nPosts;
 
-            HashSet<String> readPostHashSet = null;
-            if (readPostList != null) {
-                readPostHashSet = new HashSet<>(readPostList);
-            }
-            for (int i = 0; i < size; i++) {
+            ArrayList<String> newPostsIds = new ArrayList<>();
+            for (int i = 0; i < numberOfPosts; i++) {
                 try {
-                    if (allData.getJSONObject(i).getString(JSONUtils.KIND_KEY).equals("t3")) {
-                        JSONObject data = allData.getJSONObject(i).getJSONObject(JSONUtils.DATA_KEY);
-                        Post post = parseBasicData(data);
-                        if (readPostHashSet != null && readPostHashSet.contains(post.getId())) {
-                            post.markAsRead();
-                        }
-                        if (PostFilter.isPostAllowed(post, postFilter)) {
-                            newPosts.add(post);
-                        }
+                    if (!allPostsData.getJSONObject(i).getString(JSONUtils.KIND_KEY).equals("t3")) {
+                        continue;
+                    }
+                    JSONObject data = allPostsData.getJSONObject(i).getJSONObject(JSONUtils.DATA_KEY);
+                    Post post = parseBasicData(data);
+                    if (PostFilter.isPostAllowed(post, postFilter)) {
+                        newPosts.add(post);
+                        newPostsIds.add(post.getId());
                     }
                 } catch (JSONException e) {
                     e.printStackTrace();
                 }
             }
 
+            Set<String> readPostsIds = readPostsList.getReadPostsIdsByIds(newPostsIds);
+            for (Post post: newPosts) {
+                if (readPostsIds.contains(post.getId())) {
+                    post.markAsRead();
+                }
+            }
+
             return newPosts;
         } catch (JSONException e) {
             e.printStackTrace();
@@ -143,6 +143,7 @@ public class ParsePost {
         });
     }
 
+    @WorkerThread
     public static Post parseBasicData(JSONObject data) throws JSONException {
         String id = data.getString(JSONUtils.ID_KEY);
         String fullName = data.getString(JSONUtils.NAME_KEY);
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/post/PostPagingSource.java b/app/src/main/java/ml/docilealligator/infinityforreddit/post/PostPagingSource.java
index 0e5926b8..f2cd1f7a 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/post/PostPagingSource.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/post/PostPagingSource.java
@@ -13,9 +13,9 @@ import com.google.common.util.concurrent.ListenableFuture;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.LinkedHashSet;
-import java.util.List;
 import java.util.concurrent.Executor;
 
+import ml.docilealligator.infinityforreddit.readpost.ReadPostsListInterface;
 import ml.docilealligator.infinityforreddit.thing.SortType;
 import ml.docilealligator.infinityforreddit.account.Account;
 import ml.docilealligator.infinityforreddit.apis.RedditAPI;
@@ -53,7 +53,7 @@ public class PostPagingSource extends ListenableFuturePagingSource<String, Post>
     private final int postType;
     private final SortType sortType;
     private final PostFilter postFilter;
-    private final List<String> readPostList;
+    private final ReadPostsListInterface readPostsList;
     private String userWhere;
     private String multiRedditPath;
     private final LinkedHashSet<Post> postLinkedHashSet;
@@ -62,7 +62,7 @@ public class PostPagingSource extends ListenableFuturePagingSource<String, Post>
     PostPagingSource(Executor executor, Retrofit retrofit, @Nullable String accessToken, @NonNull String accountName,
                      SharedPreferences sharedPreferences,
                      SharedPreferences postFeedScrolledPositionSharedPreferences, int postType,
-                     SortType sortType, PostFilter postFilter, List<String> readPostList) {
+                     SortType sortType, PostFilter postFilter, ReadPostsListInterface readPostsList) {
         this.executor = executor;
         this.retrofit = retrofit;
         this.accessToken = accessToken;
@@ -72,7 +72,7 @@ public class PostPagingSource extends ListenableFuturePagingSource<String, Post>
         this.postType = postType;
         this.sortType = sortType == null ? new SortType(SortType.Type.BEST) : sortType;
         this.postFilter = postFilter;
-        this.readPostList = readPostList;
+        this.readPostsList = readPostsList;
         postLinkedHashSet = new LinkedHashSet<>();
     }
 
@@ -80,7 +80,7 @@ public class PostPagingSource extends ListenableFuturePagingSource<String, Post>
     PostPagingSource(Executor executor, Retrofit retrofit, @Nullable String accessToken, @NonNull String accountName,
                      SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                      String name, int postType, SortType sortType, PostFilter postFilter,
-                     List<String> readPostList) {
+                     ReadPostsListInterface readPostsList) {
         this.executor = executor;
         this.retrofit = retrofit;
         this.accessToken = accessToken;
@@ -102,7 +102,7 @@ public class PostPagingSource extends ListenableFuturePagingSource<String, Post>
             this.sortType = sortType;
         }
         this.postFilter = postFilter;
-        this.readPostList = readPostList;
+        this.readPostsList = readPostsList;
         postLinkedHashSet = new LinkedHashSet<>();
     }
 
@@ -110,7 +110,7 @@ public class PostPagingSource extends ListenableFuturePagingSource<String, Post>
     PostPagingSource(Executor executor, Retrofit retrofit, @Nullable String accessToken, @NonNull String accountName,
                      SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                      String path, String query, int postType, SortType sortType, PostFilter postFilter,
-                     List<String> readPostList) {
+                     ReadPostsListInterface readPostsList) {
         this.executor = executor;
         this.retrofit = retrofit;
         this.accessToken = accessToken;
@@ -130,14 +130,14 @@ public class PostPagingSource extends ListenableFuturePagingSource<String, Post>
             this.sortType = sortType;
         }
         this.postFilter = postFilter;
-        this.readPostList = readPostList;
+        this.readPostsList = readPostsList;
         postLinkedHashSet = new LinkedHashSet<>();
     }
 
     PostPagingSource(Executor executor, Retrofit retrofit, @Nullable String accessToken, @NonNull String accountName,
                      SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                      String subredditOrUserName, int postType, SortType sortType, PostFilter postFilter,
-                     String where, List<String> readPostList) {
+                     String where, ReadPostsListInterface readPostsList) {
         this.executor = executor;
         this.retrofit = retrofit;
         this.accessToken = accessToken;
@@ -149,14 +149,14 @@ public class PostPagingSource extends ListenableFuturePagingSource<String, Post>
         this.sortType = sortType == null ? new SortType(SortType.Type.NEW) : sortType;
         this.postFilter = postFilter;
         userWhere = where;
-        this.readPostList = readPostList;
+        this.readPostsList = readPostsList;
         postLinkedHashSet = new LinkedHashSet<>();
     }
 
     PostPagingSource(Executor executor, Retrofit retrofit, @Nullable String accessToken, @NonNull String accountName,
                      SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                      String subredditOrUserName, String query, String trendingSource, int postType,
-                     SortType sortType, PostFilter postFilter, List<String> readPostList) {
+                     SortType sortType, PostFilter postFilter, ReadPostsListInterface readPostsList) {
         this.executor = executor;
         this.retrofit = retrofit;
         this.accessToken = accessToken;
@@ -170,7 +170,7 @@ public class PostPagingSource extends ListenableFuturePagingSource<String, Post>
         this.sortType = sortType == null ? new SortType(SortType.Type.RELEVANCE) : sortType;
         this.postFilter = postFilter;
         postLinkedHashSet = new LinkedHashSet<>();
-        this.readPostList = readPostList;
+        this.readPostsList = readPostsList;
     }
 
     @Nullable
@@ -202,7 +202,7 @@ public class PostPagingSource extends ListenableFuturePagingSource<String, Post>
     public LoadResult<String, Post> transformData(Response<String> response) {
         if (response.isSuccessful()) {
             String responseString = response.body();
-            LinkedHashSet<Post> newPosts = ParsePost.parsePostsSync(responseString, -1, postFilter, readPostList);
+            LinkedHashSet<Post> newPosts = ParsePost.parsePostsSync(responseString, -1, postFilter, readPostsList);
             String lastItem = ParsePost.getLastItem(responseString);
             if (newPosts == null) {
                 return new LoadResult.Error<>(new Exception("Error parsing posts"));
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/post/PostViewModel.java b/app/src/main/java/ml/docilealligator/infinityforreddit/post/PostViewModel.java
index 47ec89e2..21fca70a 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/post/PostViewModel.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/post/PostViewModel.java
@@ -18,9 +18,9 @@ import androidx.paging.PagingData;
 import androidx.paging.PagingDataTransforms;
 import androidx.paging.PagingLiveData;
 
-import java.util.List;
 import java.util.concurrent.Executor;
 
+import ml.docilealligator.infinityforreddit.readpost.ReadPostsListInterface;
 import ml.docilealligator.infinityforreddit.thing.SortType;
 import ml.docilealligator.infinityforreddit.account.Account;
 import ml.docilealligator.infinityforreddit.postfilter.PostFilter;
@@ -41,7 +41,7 @@ public class PostViewModel extends ViewModel {
     private SortType sortType;
     private PostFilter postFilter;
     private String userWhere;
-    private final List<String> readPostList;
+    private ReadPostsListInterface readPostsList;
     private final MutableLiveData<Boolean> currentlyReadPostIdsLiveData = new MutableLiveData<>();
 
     private final LiveData<PagingData<Post>> posts;
@@ -55,7 +55,7 @@ public class PostViewModel extends ViewModel {
     public PostViewModel(Executor executor, Retrofit retrofit, @Nullable String accessToken, @NonNull String accountName,
                          SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                          @Nullable SharedPreferences postHistorySharedPreferences, int postType,
-                         SortType sortType, PostFilter postFilter, List<String> readPostList) {
+                         SortType sortType, PostFilter postFilter, ReadPostsListInterface readPostsList) {
         this.executor = executor;
         this.retrofit = retrofit;
         this.accessToken = accessToken;
@@ -65,7 +65,7 @@ public class PostViewModel extends ViewModel {
         this.postType = postType;
         this.sortType = sortType;
         this.postFilter = postFilter;
-        this.readPostList = readPostList;
+        this.readPostsList = readPostsList;
 
         sortTypeLiveData = new MutableLiveData<>(sortType);
         postFilterLiveData = new MutableLiveData<>(postFilter);
@@ -95,7 +95,7 @@ public class PostViewModel extends ViewModel {
     public PostViewModel(Executor executor, Retrofit retrofit, @Nullable String accessToken, @NonNull String accountName,
                          SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                          @Nullable SharedPreferences postHistorySharedPreferences, String subredditName, int postType,
-                         SortType sortType, PostFilter postFilter, List<String> readPostList) {
+                         SortType sortType, PostFilter postFilter, ReadPostsListInterface readPostsList) {
         this.executor = executor;
         this.retrofit = retrofit;
         this.accessToken = accessToken;
@@ -105,7 +105,7 @@ public class PostViewModel extends ViewModel {
         this.postType = postType;
         this.sortType = sortType;
         this.postFilter = postFilter;
-        this.readPostList = readPostList;
+        this.readPostsList = readPostsList;
         this.name = subredditName;
 
         sortTypeLiveData = new MutableLiveData<>(sortType);
@@ -136,7 +136,7 @@ public class PostViewModel extends ViewModel {
     public PostViewModel(Executor executor, Retrofit retrofit, @Nullable String accessToken, @NonNull String accountName,
                          SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                          @Nullable SharedPreferences postHistorySharedPreferences, String multiredditPath, String query, int postType,
-                         SortType sortType, PostFilter postFilter, List<String> readPostList) {
+                         SortType sortType, PostFilter postFilter, ReadPostsListInterface readPostsList) {
         this.executor = executor;
         this.retrofit = retrofit;
         this.accessToken = accessToken;
@@ -146,7 +146,7 @@ public class PostViewModel extends ViewModel {
         this.postType = postType;
         this.sortType = sortType;
         this.postFilter = postFilter;
-        this.readPostList = readPostList;
+        this.readPostsList = readPostsList;
         this.name = multiredditPath;
         this.query = query;
 
@@ -179,7 +179,7 @@ public class PostViewModel extends ViewModel {
                          SharedPreferences postFeedScrolledPositionSharedPreferences,
                          @Nullable SharedPreferences postHistorySharedPreferences, String username,
                          int postType, SortType sortType, PostFilter postFilter, String userWhere,
-                         List<String> readPostList) {
+                         ReadPostsListInterface readPostsList) {
         this.executor = executor;
         this.retrofit = retrofit;
         this.accessToken = accessToken;
@@ -189,7 +189,7 @@ public class PostViewModel extends ViewModel {
         this.postType = postType;
         this.sortType = sortType;
         this.postFilter = postFilter;
-        this.readPostList = readPostList;
+        this.readPostsList = readPostsList;
         this.name = username;
         this.userWhere = userWhere;
 
@@ -222,7 +222,7 @@ public class PostViewModel extends ViewModel {
                          SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                          @Nullable SharedPreferences postHistorySharedPreferences, String subredditName, String query,
                          String trendingSource, int postType, SortType sortType, PostFilter postFilter,
-                         List<String> readPostList) {
+                         ReadPostsListInterface readPostsList) {
         this.executor = executor;
         this.retrofit = retrofit;
         this.accessToken = accessToken;
@@ -232,7 +232,7 @@ public class PostViewModel extends ViewModel {
         this.postType = postType;
         this.sortType = sortType;
         this.postFilter = postFilter;
-        this.readPostList = readPostList;
+        this.readPostsList = readPostsList;
         this.name = subredditName;
         this.query = query;
         this.trendingSource = trendingSource;
@@ -275,30 +275,30 @@ public class PostViewModel extends ViewModel {
             case PostPagingSource.TYPE_FRONT_PAGE:
                 paging3PagingSource = new PostPagingSource(executor, retrofit, accessToken, accountName,
                         sharedPreferences, postFeedScrolledPositionSharedPreferences, postType, sortType,
-                        postFilter, readPostList);
+                        postFilter, readPostsList);
                 break;
             case PostPagingSource.TYPE_SUBREDDIT:
             case PostPagingSource.TYPE_ANONYMOUS_FRONT_PAGE:
             case PostPagingSource.TYPE_ANONYMOUS_MULTIREDDIT:
                 paging3PagingSource = new PostPagingSource(executor, retrofit, accessToken, accountName,
                         sharedPreferences, postFeedScrolledPositionSharedPreferences, name, postType,
-                        sortType, postFilter, readPostList);
+                        sortType, postFilter, readPostsList);
                 break;
             case PostPagingSource.TYPE_MULTI_REDDIT:
                 paging3PagingSource = new PostPagingSource(executor, retrofit, accessToken, accountName,
                         sharedPreferences, postFeedScrolledPositionSharedPreferences, name, query, postType,
-                        sortType, postFilter, readPostList);
+                        sortType, postFilter, readPostsList);
                 break;
             case PostPagingSource.TYPE_SEARCH:
                 paging3PagingSource = new PostPagingSource(executor, retrofit, accessToken, accountName,
                         sharedPreferences, postFeedScrolledPositionSharedPreferences, name, query, trendingSource,
-                        postType, sortType, postFilter, readPostList);
+                        postType, sortType, postFilter, readPostsList);
                 break;
             default:
                 //User
                 paging3PagingSource = new PostPagingSource(executor, retrofit, accessToken, accountName,
                         sharedPreferences, postFeedScrolledPositionSharedPreferences, name, postType,
-                        sortType, postFilter, userWhere, readPostList);
+                        sortType, postFilter, userWhere, readPostsList);
                 break;
         }
         return paging3PagingSource;
@@ -332,13 +332,13 @@ public class PostViewModel extends ViewModel {
         private final SortType sortType;
         private final PostFilter postFilter;
         private String userWhere;
-        private List<String> readPostList;
+        private final ReadPostsListInterface readPostsList;
 
         // Front page
         public Factory(Executor executor, Retrofit retrofit, @Nullable String accessToken, @NonNull String accountName,
                        SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                        SharedPreferences postHistorySharedPreferences, int postType, SortType sortType,
-                       PostFilter postFilter, List<String> readPostList) {
+                       PostFilter postFilter, ReadPostsListInterface readPostsList) {
             this.executor = executor;
             this.retrofit = retrofit;
             this.accessToken = accessToken;
@@ -349,14 +349,14 @@ public class PostViewModel extends ViewModel {
             this.postType = postType;
             this.sortType = sortType;
             this.postFilter = postFilter;
-            this.readPostList = readPostList;
+            this.readPostsList = readPostsList;
         }
 
         // PostPagingSource.TYPE_SUBREDDIT
         public Factory(Executor executor, Retrofit retrofit, @Nullable String accessToken, @NonNull String accountName,
                        SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                        SharedPreferences postHistorySharedPreferences, String name, int postType, SortType sortType,
-                       PostFilter postFilter, List<String> readPostList) {
+                       PostFilter postFilter, ReadPostsListInterface readPostsList) {
             this.executor = executor;
             this.retrofit = retrofit;
             this.accessToken = accessToken;
@@ -368,14 +368,14 @@ public class PostViewModel extends ViewModel {
             this.postType = postType;
             this.sortType = sortType;
             this.postFilter = postFilter;
-            this.readPostList = readPostList;
+            this.readPostsList = readPostsList;
         }
 
         // PostPagingSource.TYPE_MULTI_REDDIT
         public Factory(Executor executor, Retrofit retrofit, @Nullable String accessToken, @NonNull String accountName,
                        SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                        SharedPreferences postHistorySharedPreferences, String name, String query, int postType, SortType sortType,
-                       PostFilter postFilter, List<String> readPostList) {
+                       PostFilter postFilter, ReadPostsListInterface readPostsList) {
             this.executor = executor;
             this.retrofit = retrofit;
             this.accessToken = accessToken;
@@ -388,14 +388,14 @@ public class PostViewModel extends ViewModel {
             this.postType = postType;
             this.sortType = sortType;
             this.postFilter = postFilter;
-            this.readPostList = readPostList;
+            this.readPostsList = readPostsList;
         }
 
         //User posts
         public Factory(Executor executor, Retrofit retrofit, @Nullable String accessToken, @NonNull String accountName,
                        SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                        SharedPreferences postHistorySharedPreferences, String username, int postType,
-                       SortType sortType, PostFilter postFilter, String where, List<String> readPostList) {
+                       SortType sortType, PostFilter postFilter, String where, ReadPostsListInterface readPostsList) {
             this.executor = executor;
             this.retrofit = retrofit;
             this.accessToken = accessToken;
@@ -408,14 +408,14 @@ public class PostViewModel extends ViewModel {
             this.sortType = sortType;
             this.postFilter = postFilter;
             userWhere = where;
-            this.readPostList = readPostList;
+            this.readPostsList = readPostsList;
         }
 
         // PostPagingSource.TYPE_SEARCH
         public Factory(Executor executor, Retrofit retrofit, @Nullable String accessToken, @NonNull String accountName,
                        SharedPreferences sharedPreferences, SharedPreferences postFeedScrolledPositionSharedPreferences,
                        SharedPreferences postHistorySharedPreferences, String name, String query, String trendingSource,
-                       int postType, SortType sortType, PostFilter postFilter, List<String> readPostList) {
+                       int postType, SortType sortType, PostFilter postFilter, ReadPostsListInterface readPostsList) {
             this.executor = executor;
             this.retrofit = retrofit;
             this.accessToken = accessToken;
@@ -429,12 +429,12 @@ public class PostViewModel extends ViewModel {
             this.postType = postType;
             this.sortType = sortType;
             this.postFilter = postFilter;
-            this.readPostList = readPostList;
+            this.readPostsList = readPostsList;
         }
 
         //Anonymous Front Page
         public Factory(Executor executor, Retrofit retrofit, SharedPreferences sharedPreferences,
-                       String concatenatedSubredditNames, int postType, SortType sortType, PostFilter postFilter) {
+                       String concatenatedSubredditNames, int postType, SortType sortType, PostFilter postFilter, ReadPostsListInterface readPostsList) {
             this.executor = executor;
             this.retrofit = retrofit;
             this.sharedPreferences = sharedPreferences;
@@ -442,6 +442,7 @@ public class PostViewModel extends ViewModel {
             this.postType = postType;
             this.sortType = sortType;
             this.postFilter = postFilter;
+            this.readPostsList = readPostsList;
         }
 
         @NonNull
@@ -450,27 +451,27 @@ public class PostViewModel extends ViewModel {
             if (postType == PostPagingSource.TYPE_FRONT_PAGE) {
                 return (T) new PostViewModel(executor, retrofit, accessToken, accountName, sharedPreferences,
                         postFeedScrolledPositionSharedPreferences, postHistorySharedPreferences, postType,
-                        sortType, postFilter, readPostList);
+                        sortType, postFilter, readPostsList);
             } else if (postType == PostPagingSource.TYPE_SEARCH) {
                 return (T) new PostViewModel(executor, retrofit, accessToken, accountName, sharedPreferences,
                         postFeedScrolledPositionSharedPreferences, postHistorySharedPreferences, name, query,
-                        trendingSource, postType, sortType, postFilter, readPostList);
+                        trendingSource, postType, sortType, postFilter, readPostsList);
             } else if (postType == PostPagingSource.TYPE_SUBREDDIT) {
                 return (T) new PostViewModel(executor, retrofit, accessToken, accountName, sharedPreferences,
                         postFeedScrolledPositionSharedPreferences, postHistorySharedPreferences, name,
-                        postType, sortType, postFilter, readPostList);
+                        postType, sortType, postFilter, readPostsList);
             } else if (postType == PostPagingSource.TYPE_MULTI_REDDIT) {
                 return (T) new PostViewModel(executor, retrofit, accessToken, accountName, sharedPreferences,
                         postFeedScrolledPositionSharedPreferences, postHistorySharedPreferences, name, query,
-                        postType, sortType, postFilter, readPostList);
+                        postType, sortType, postFilter, readPostsList);
             } else if (postType == PostPagingSource.TYPE_ANONYMOUS_FRONT_PAGE || postType == PostPagingSource.TYPE_ANONYMOUS_MULTIREDDIT) {
                 return (T) new PostViewModel(executor, retrofit, null, null, sharedPreferences,
                         null, null, name, postType, sortType,
-                        postFilter, null);
+                        postFilter, readPostsList);
             } else {
                 return (T) new PostViewModel(executor, retrofit, accessToken, accountName, sharedPreferences,
                         postFeedScrolledPositionSharedPreferences, postHistorySharedPreferences, name,
-                        postType, sortType, postFilter, userWhere, readPostList);
+                        postType, sortType, postFilter, userWhere, readPostsList);
             }
         }
     }
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/InsertReadPost.java b/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/InsertReadPost.java
index be548700..d6835845 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/InsertReadPost.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/InsertReadPost.java
@@ -6,13 +6,15 @@ import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
 
 public class InsertReadPost {
     public static void insertReadPost(RedditDataRoomDatabase redditDataRoomDatabase, Executor executor,
-                                      String username, String postId) {
+                                      String username, String postId, int readPostsLimit) {
         executor.execute(() -> {
             ReadPostDao readPostDao = redditDataRoomDatabase.readPostDao();
-            if (readPostDao.getReadPostsCount() > 500) {
+            int limit = Math.max(readPostsLimit, 500);
+            boolean isReadPostLimit = readPostsLimit != -1;
+            while (readPostDao.getReadPostsCount(username) > limit && isReadPostLimit) {
                 readPostDao.deleteOldestReadPosts(username);
             }
-            if (username != null && !username.equals("")) {
+            if (username != null && !username.isEmpty()) {
                 readPostDao.insert(new ReadPost(username, postId));
             }
         });
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/NullReadPostsList.java b/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/NullReadPostsList.java
new file mode 100644
index 00000000..6c68522b
--- /dev/null
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/NullReadPostsList.java
@@ -0,0 +1,20 @@
+package ml.docilealligator.infinityforreddit.readpost;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+
+public class NullReadPostsList implements ReadPostsListInterface {
+    public static NullReadPostsList getInstance() {
+        return InstanceHolder.instance;
+    }
+
+    @Override
+    public Set<String> getReadPostsIdsByIds(List<String> ids) {
+        return Collections.emptySet();
+    }
+
+    private static class InstanceHolder {
+        private static final NullReadPostsList instance = new NullReadPostsList();
+    }
+}
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/ReadPostDao.java b/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/ReadPostDao.java
index 5f7fb8da..db5253a3 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/ReadPostDao.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/ReadPostDao.java
@@ -20,18 +20,24 @@ public interface ReadPostDao {
     @Query("SELECT * FROM read_posts WHERE username = :username AND (:before IS NULL OR time < :before) ORDER BY time DESC LIMIT 25")
     List<ReadPost> getAllReadPosts(String username, Long before);
 
-    @Query("SELECT * FROM read_posts WHERE username = :username")
-    List<ReadPost> getAllReadPosts(String username);
-
     @Query("SELECT * FROM read_posts WHERE id = :id LIMIT 1")
     ReadPost getReadPost(String id);
 
-    @Query("SELECT COUNT(id) FROM read_posts")
-    int getReadPostsCount();
+    @Query("SELECT COUNT(id) FROM read_posts WHERE username = :username")
+    int getReadPostsCount(String username);
 
     @Query("DELETE FROM read_posts WHERE rowid IN (SELECT rowid FROM read_posts ORDER BY time ASC LIMIT 100) AND username = :username")
     void deleteOldestReadPosts(String username);
 
     @Query("DELETE FROM read_posts")
     void deleteAllReadPosts();
+
+    @Query("SELECT id FROM read_posts WHERE id IN (:ids) AND username = :username")
+    List<String> getReadPostsIdsByIds(List<String> ids, String username);
+
+    default int getMaxReadPostEntrySize() { // in bytes
+        return  20 + // max username size
+                10 + // id size
+                8;   // time size
+    }
 }
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/ReadPostsList.java b/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/ReadPostsList.java
new file mode 100644
index 00000000..08b8c5ed
--- /dev/null
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/ReadPostsList.java
@@ -0,0 +1,24 @@
+package ml.docilealligator.infinityforreddit.readpost;
+
+import androidx.annotation.WorkerThread;
+
+import java.util.HashSet;
+import java.util.List;
+
+public class ReadPostsList implements ReadPostsListInterface {
+    private final ReadPostDao readPostDao;
+    private final String accountName;
+    private final boolean readPostsDisabled;
+
+    public ReadPostsList(ReadPostDao readPostDao, String accountName, boolean readPostsDisabled) {
+        this.accountName = accountName;
+        this.readPostDao = readPostDao;
+        this.readPostsDisabled = readPostsDisabled;
+    }
+
+    @WorkerThread
+    @Override
+    public HashSet<String> getReadPostsIdsByIds(List<String> ids) {
+        return readPostsDisabled ? new HashSet<>() : new HashSet<>(this.readPostDao.getReadPostsIdsByIds(ids, accountName));
+    }
+}
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/ReadPostsListInterface.java b/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/ReadPostsListInterface.java
new file mode 100644
index 00000000..3563ed55
--- /dev/null
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/ReadPostsListInterface.java
@@ -0,0 +1,8 @@
+package ml.docilealligator.infinityforreddit.readpost;
+
+import java.util.List;
+import java.util.Set;
+
+public interface ReadPostsListInterface {
+    Set<String> getReadPostsIdsByIds(List<String> ids);
+}
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/ReadPostsUtils.java b/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/ReadPostsUtils.java
new file mode 100644
index 00000000..a56bf9c8
--- /dev/null
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/readpost/ReadPostsUtils.java
@@ -0,0 +1,14 @@
+package ml.docilealligator.infinityforreddit.readpost;
+
+import android.content.SharedPreferences;
+import ml.docilealligator.infinityforreddit.utils.SharedPreferencesUtils;
+
+public class ReadPostsUtils {
+    public static int GetReadPostsLimit(String accountName, SharedPreferences mPostHistorySharedPreferences) {
+        if (mPostHistorySharedPreferences.getBoolean(accountName + SharedPreferencesUtils.READ_POSTS_LIMIT_ENABLED, true)) {
+            return mPostHistorySharedPreferences.getInt(accountName + SharedPreferencesUtils.READ_POSTS_LIMIT, 500);
+        } else {
+            return -1;
+        }
+    }
+}
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/settings/AdvancedPreferenceFragment.java b/app/src/main/java/ml/docilealligator/infinityforreddit/settings/AdvancedPreferenceFragment.java
index a430cb14..99a22068 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/settings/AdvancedPreferenceFragment.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/settings/AdvancedPreferenceFragment.java
@@ -8,6 +8,7 @@ import android.content.SharedPreferences;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
+import android.os.Looper;
 import android.widget.Toast;
 
 import androidx.annotation.Nullable;
@@ -36,6 +37,7 @@ import ml.docilealligator.infinityforreddit.asynctasks.DeleteAllUsers;
 import ml.docilealligator.infinityforreddit.asynctasks.RestoreSettings;
 import ml.docilealligator.infinityforreddit.customviews.CustomFontPreferenceFragmentCompat;
 import ml.docilealligator.infinityforreddit.events.RecreateActivityEvent;
+import ml.docilealligator.infinityforreddit.readpost.ReadPostDao;
 import ml.docilealligator.infinityforreddit.utils.SharedPreferencesUtils;
 
 /**
@@ -85,6 +87,7 @@ public class AdvancedPreferenceFragment extends CustomFontPreferenceFragmentComp
     SharedPreferences postHistorySharedPreferences;
     @Inject
     Executor executor;
+    private Handler handler;
 
     @Override
     public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
@@ -104,12 +107,14 @@ public class AdvancedPreferenceFragment extends CustomFontPreferenceFragmentComp
         Preference backupSettingsPreference = findPreference(SharedPreferencesUtils.BACKUP_SETTINGS);
         Preference restoreSettingsPreference = findPreference(SharedPreferencesUtils.RESTORE_SETTINGS);
 
+        handler = new Handler(Looper.getMainLooper());
+
         if (deleteSubredditsPreference != null) {
             deleteSubredditsPreference.setOnPreferenceClickListener(preference -> {
                 new MaterialAlertDialogBuilder(activity, R.style.MaterialAlertDialogTheme)
                         .setTitle(R.string.are_you_sure)
                         .setPositiveButton(R.string.yes, (dialogInterface, i)
-                                -> DeleteAllSubreddits.deleteAllSubreddits(executor, new Handler(), mRedditDataRoomDatabase,
+                                -> DeleteAllSubreddits.deleteAllSubreddits(executor, handler, mRedditDataRoomDatabase,
                                         () -> Toast.makeText(activity, R.string.delete_all_subreddits_success, Toast.LENGTH_SHORT).show()))
                         .setNegativeButton(R.string.no, null)
                         .show();
@@ -122,7 +127,7 @@ public class AdvancedPreferenceFragment extends CustomFontPreferenceFragmentComp
                 new MaterialAlertDialogBuilder(activity, R.style.MaterialAlertDialogTheme)
                         .setTitle(R.string.are_you_sure)
                         .setPositiveButton(R.string.yes, (dialogInterface, i)
-                                -> DeleteAllUsers.deleteAllUsers(executor, new Handler(), mRedditDataRoomDatabase,
+                                -> DeleteAllUsers.deleteAllUsers(executor, handler, mRedditDataRoomDatabase,
                                         () -> Toast.makeText(activity, R.string.delete_all_users_success, Toast.LENGTH_SHORT).show()))
                         .setNegativeButton(R.string.no, null)
                         .show();
@@ -135,7 +140,7 @@ public class AdvancedPreferenceFragment extends CustomFontPreferenceFragmentComp
                 new MaterialAlertDialogBuilder(activity, R.style.MaterialAlertDialogTheme)
                         .setTitle(R.string.are_you_sure)
                         .setPositiveButton(R.string.yes, (dialogInterface, i)
-                                -> DeleteAllSortTypes.deleteAllSortTypes(executor, new Handler(),
+                                -> DeleteAllSortTypes.deleteAllSortTypes(executor, handler,
                                 mSharedPreferences, mSortTypeSharedPreferences, () -> {
                                     Toast.makeText(activity, R.string.delete_all_sort_types_success, Toast.LENGTH_SHORT).show();
                                     EventBus.getDefault().post(new RecreateActivityEvent());
@@ -151,7 +156,7 @@ public class AdvancedPreferenceFragment extends CustomFontPreferenceFragmentComp
                 new MaterialAlertDialogBuilder(activity, R.style.MaterialAlertDialogTheme)
                         .setTitle(R.string.are_you_sure)
                         .setPositiveButton(R.string.yes, (dialogInterface, i)
-                                -> DeleteAllPostLayouts.deleteAllPostLayouts(executor, new Handler(),
+                                -> DeleteAllPostLayouts.deleteAllPostLayouts(executor, handler,
                                 mSharedPreferences, mPostLayoutSharedPreferences, () -> {
                                     Toast.makeText(activity, R.string.delete_all_post_layouts_success, Toast.LENGTH_SHORT).show();
                                     EventBus.getDefault().post(new RecreateActivityEvent());
@@ -167,7 +172,7 @@ public class AdvancedPreferenceFragment extends CustomFontPreferenceFragmentComp
                 new MaterialAlertDialogBuilder(activity, R.style.MaterialAlertDialogTheme)
                         .setTitle(R.string.are_you_sure)
                         .setPositiveButton(R.string.yes, (dialogInterface, i)
-                                -> DeleteAllThemes.deleteAllThemes(executor, new Handler(),
+                                -> DeleteAllThemes.deleteAllThemes(executor, handler,
                                 mRedditDataRoomDatabase, lightThemeSharedPreferences,
                                         darkThemeSharedPreferences, amoledThemeSharedPreferences, () -> {
                                     Toast.makeText(activity, R.string.delete_all_themes_success, Toast.LENGTH_SHORT).show();
@@ -195,11 +200,18 @@ public class AdvancedPreferenceFragment extends CustomFontPreferenceFragmentComp
         }
 
         if (deleteReadPostsPreference != null) {
+            executor.execute(() -> {
+                ReadPostDao readPostDao = mRedditDataRoomDatabase.readPostDao();
+                int tableCount = readPostDao.getReadPostsCount(activity.accountName);
+                long tableEntrySize = readPostDao.getMaxReadPostEntrySize();
+                long tableSize = tableEntrySize * tableCount / 1024;
+                handler.post(() -> deleteReadPostsPreference.setSummary(getString(R.string.settings_read_posts_db_summary, tableSize, tableCount)));
+            });
             deleteReadPostsPreference.setOnPreferenceClickListener(preference -> {
                 new MaterialAlertDialogBuilder(activity, R.style.MaterialAlertDialogTheme)
                         .setTitle(R.string.are_you_sure)
                         .setPositiveButton(R.string.yes, (dialogInterface, i)
-                                -> DeleteAllReadPosts.deleteAllReadPosts(executor, new Handler(),
+                                -> DeleteAllReadPosts.deleteAllReadPosts(executor, handler,
                                 mRedditDataRoomDatabase, () -> {
                             Toast.makeText(activity, R.string.delete_all_read_posts_success, Toast.LENGTH_SHORT).show();
                         }))
@@ -308,7 +320,7 @@ public class AdvancedPreferenceFragment extends CustomFontPreferenceFragmentComp
         if (resultCode == RESULT_OK) {
             if (requestCode == SELECT_BACKUP_SETTINGS_DIRECTORY_REQUEST_CODE) {
                 Uri uri = data.getData();
-                BackupSettings.backupSettings(activity, executor, new Handler(), activity.getContentResolver(), uri,
+                BackupSettings.backupSettings(activity, executor, handler, activity.getContentResolver(), uri,
                         mRedditDataRoomDatabase, mSharedPreferences, lightThemeSharedPreferences, darkThemeSharedPreferences,
                         amoledThemeSharedPreferences, mSortTypeSharedPreferences, mPostLayoutSharedPreferences,
                         postFeedScrolledPositionSharedPreferences, mainActivityTabsSharedPreferences,
@@ -326,7 +338,7 @@ public class AdvancedPreferenceFragment extends CustomFontPreferenceFragmentComp
                         });
             } else if (requestCode == SELECT_RESTORE_SETTINGS_DIRECTORY_REQUEST_CODE) {
                 Uri uri = data.getData();
-                RestoreSettings.restoreSettings(activity, executor, new Handler(), activity.getContentResolver(), uri,
+                RestoreSettings.restoreSettings(activity, executor, handler, activity.getContentResolver(), uri,
                         mRedditDataRoomDatabase, mSharedPreferences, lightThemeSharedPreferences, darkThemeSharedPreferences,
                         amoledThemeSharedPreferences, mSortTypeSharedPreferences, mPostLayoutSharedPreferences,
                         postFeedScrolledPositionSharedPreferences, mainActivityTabsSharedPreferences,
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/settings/PostHistoryFragment.java b/app/src/main/java/ml/docilealligator/infinityforreddit/settings/PostHistoryFragment.java
index 0268a7ca..5da131c7 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/settings/PostHistoryFragment.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/settings/PostHistoryFragment.java
@@ -2,20 +2,29 @@ package ml.docilealligator.infinityforreddit.settings;
 
 import android.content.Context;
 import android.content.SharedPreferences;
+import android.content.res.ColorStateList;
+import android.graphics.PorterDuff;
 import android.graphics.drawable.Drawable;
+import android.os.Build;
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.EditText;
+import android.widget.TextView;
 
 import androidx.annotation.NonNull;
 import androidx.fragment.app.Fragment;
 
+import java.lang.reflect.Field;
+import java.util.concurrent.Executor;
+
 import javax.inject.Inject;
 import javax.inject.Named;
 
 import ml.docilealligator.infinityforreddit.Infinity;
 import ml.docilealligator.infinityforreddit.R;
+import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
 import ml.docilealligator.infinityforreddit.account.Account;
 import ml.docilealligator.infinityforreddit.activities.SettingsActivity;
 import ml.docilealligator.infinityforreddit.databinding.FragmentPostHistoryBinding;
@@ -28,6 +37,10 @@ public class PostHistoryFragment extends Fragment {
     @Inject
     @Named("post_history")
     SharedPreferences postHistorySharedPreferences;
+    @Inject
+    RedditDataRoomDatabase mRedditDataRoomDatabase;
+    @Inject
+    Executor mExecutor;
     private SettingsActivity activity;
 
     public PostHistoryFragment() {
@@ -49,9 +62,12 @@ public class PostHistoryFragment extends Fragment {
             Utils.setFontToAllTextViews(binding.getRoot(), activity.typeface);
         }
 
-        if (activity.accountName.equals(Account.ANONYMOUS_ACCOUNT)) {
+        boolean isAnonymous = activity.accountName.equals(Account.ANONYMOUS_ACCOUNT);
+        if (isAnonymous) {
             binding.infoTextViewPostHistoryFragment.setText(R.string.only_for_logged_in_user);
             binding.markPostsAsReadLinearLayoutPostHistoryFragment.setVisibility(View.GONE);
+            binding.readPostsLimitLinearLayoutPostHistoryFragment.setVisibility(View.GONE);
+            binding.readPostsLimitTextInputLayoutPostHistoryFragment.setVisibility(View.GONE);
             binding.markPostsAsReadAfterVotingLinearLayoutPostHistoryFragment.setVisibility(View.GONE);
             binding.markPostsAsReadOnScrollLinearLayoutPostHistoryFragment.setVisibility(View.GONE);
             binding.hideReadPostsAutomaticallyLinearLayoutPostHistoryFragment.setVisibility(View.GONE);
@@ -60,6 +76,10 @@ public class PostHistoryFragment extends Fragment {
 
         binding.markPostsAsReadSwitchPostHistoryFragment.setChecked(postHistorySharedPreferences.getBoolean(
                 activity.accountName + SharedPreferencesUtils.MARK_POSTS_AS_READ_BASE, false));
+        binding.readPostsLimitSwitchPostHistoryFragment.setChecked(postHistorySharedPreferences.getBoolean(
+                activity.accountName + SharedPreferencesUtils.READ_POSTS_LIMIT_ENABLED, true));
+        binding.readPostsLimitTextInputEditTextPostHistoryFragment.setText(String.valueOf(postHistorySharedPreferences.getInt(
+                activity.accountName + SharedPreferencesUtils.READ_POSTS_LIMIT, 500)));
         binding.markPostsAsReadAfterVotingSwitchPostHistoryFragment.setChecked(postHistorySharedPreferences.getBoolean(
                 activity.accountName + SharedPreferencesUtils.MARK_POSTS_AS_READ_AFTER_VOTING_BASE, false));
         binding.markPostsAsReadOnScrollSwitchPostHistoryFragment.setChecked(postHistorySharedPreferences.getBoolean(
@@ -67,12 +87,37 @@ public class PostHistoryFragment extends Fragment {
         binding.hideReadPostsAutomaticallySwitchPostHistoryFragment.setChecked(postHistorySharedPreferences.getBoolean(
                 activity.accountName + SharedPreferencesUtils.HIDE_READ_POSTS_AUTOMATICALLY_BASE, false));
 
-        binding.markPostsAsReadLinearLayoutPostHistoryFragment.setOnClickListener(view -> {
-            binding.markPostsAsReadSwitchPostHistoryFragment.performClick();
+        updateOptions();
+
+        binding.markPostsAsReadLinearLayoutPostHistoryFragment.setOnClickListener(view ->
+                binding.markPostsAsReadSwitchPostHistoryFragment.performClick());
+        binding.markPostsAsReadSwitchPostHistoryFragment.setOnCheckedChangeListener((compoundButton, b) -> {
+            postHistorySharedPreferences.edit().putBoolean(activity.accountName + SharedPreferencesUtils.MARK_POSTS_AS_READ_BASE, b).apply();
+            updateOptions();
         });
 
-        binding.markPostsAsReadSwitchPostHistoryFragment.setOnCheckedChangeListener((compoundButton, b) ->
-                postHistorySharedPreferences.edit().putBoolean(activity.accountName + SharedPreferencesUtils.MARK_POSTS_AS_READ_BASE, b).apply());
+
+        binding.readPostsLimitLinearLayoutPostHistoryFragment.setOnClickListener(view ->
+            binding.readPostsLimitSwitchPostHistoryFragment.performClick());
+        binding.readPostsLimitSwitchPostHistoryFragment.setOnCheckedChangeListener((compoundButton, b) -> {
+            postHistorySharedPreferences.edit().putBoolean(activity.accountName + SharedPreferencesUtils.READ_POSTS_LIMIT_ENABLED, b).apply();
+            updateOptions();
+        });
+        binding.readPostsLimitTextInputEditTextPostHistoryFragment.setOnFocusChangeListener((view, b) -> {
+            if (!b) {
+                String readPostsLimitString = binding.readPostsLimitTextInputEditTextPostHistoryFragment.getText().toString();
+                if (readPostsLimitString.isEmpty()) {
+                    binding.readPostsLimitTextInputEditTextPostHistoryFragment.setText("500");
+                } else {
+                    int readPostsLimit = Integer.parseInt(readPostsLimitString);
+                    if (readPostsLimit < 100) {
+                        binding.readPostsLimitTextInputEditTextPostHistoryFragment.setText("100");
+                    }
+                }
+                postHistorySharedPreferences.edit().putInt(activity.accountName + SharedPreferencesUtils.READ_POSTS_LIMIT,
+                        Integer.parseInt(binding.readPostsLimitTextInputEditTextPostHistoryFragment.getText().toString())).apply();
+            }
+        });
 
         binding.markPostsAsReadAfterVotingLinearLayoutPostHistoryFragment.setOnClickListener(view -> binding.markPostsAsReadAfterVotingSwitchPostHistoryFragment.performClick());
 
@@ -90,15 +135,65 @@ public class PostHistoryFragment extends Fragment {
         return binding.getRoot();
     }
 
+    private void updateOptions() {
+        if (binding.markPostsAsReadSwitchPostHistoryFragment.isChecked()) {
+            binding.readPostsLimitLinearLayoutPostHistoryFragment.setVisibility(View.VISIBLE);
+            binding.readPostsLimitTextInputLayoutPostHistoryFragment.setVisibility(View.VISIBLE);
+            binding.markPostsAsReadAfterVotingLinearLayoutPostHistoryFragment.setVisibility(View.VISIBLE);
+            binding.markPostsAsReadOnScrollLinearLayoutPostHistoryFragment.setVisibility(View.VISIBLE);
+            binding.hideReadPostsAutomaticallyLinearLayoutPostHistoryFragment.setVisibility(View.VISIBLE);
+
+            boolean limitReadPosts = postHistorySharedPreferences.getBoolean(
+                    activity.accountName + SharedPreferencesUtils.READ_POSTS_LIMIT_ENABLED, true);
+            binding.readPostsLimitTextInputLayoutPostHistoryFragment.setVisibility(limitReadPosts ? View.VISIBLE : View.GONE);
+        } else {
+            binding.readPostsLimitLinearLayoutPostHistoryFragment.setVisibility(View.GONE);
+            binding.readPostsLimitTextInputLayoutPostHistoryFragment.setVisibility(View.GONE);
+            binding.markPostsAsReadAfterVotingLinearLayoutPostHistoryFragment.setVisibility(View.GONE);
+            binding.markPostsAsReadOnScrollLinearLayoutPostHistoryFragment.setVisibility(View.GONE);
+            binding.hideReadPostsAutomaticallyLinearLayoutPostHistoryFragment.setVisibility(View.GONE);
+        }
+    }
+
     private void applyCustomTheme() {
         binding.infoTextViewPostHistoryFragment.setTextColor(activity.customThemeWrapper.getSecondaryTextColor());
         Drawable infoDrawable = Utils.getTintedDrawable(activity, R.drawable.ic_info_preference_day_night_24dp, activity.customThemeWrapper.getPrimaryIconColor());
         binding.infoTextViewPostHistoryFragment.setCompoundDrawablesWithIntrinsicBounds(infoDrawable, null, null, null);
         int primaryTextColor = activity.customThemeWrapper.getPrimaryTextColor();
         binding.markPostsAsReadTextViewPostHistoryFragment.setTextColor(primaryTextColor);
+        binding.readPostsLimitTextViewPostHistoryFragment.setTextColor(primaryTextColor);
+        binding.readPostsLimitTextInputLayoutPostHistoryFragment.setBoxStrokeColor(primaryTextColor);
+        binding.readPostsLimitTextInputLayoutPostHistoryFragment.setDefaultHintTextColor(ColorStateList.valueOf(primaryTextColor));
+        binding.readPostsLimitTextInputEditTextPostHistoryFragment.setTextColor(primaryTextColor);
         binding.markPostsAsReadAfterVotingTextViewPostHistoryFragment.setTextColor(primaryTextColor);
         binding.markPostsAsReadOnScrollTextViewPostHistoryFragment.setTextColor(primaryTextColor);
         binding.hideReadPostsAutomaticallyTextViewPostHistoryFragment.setTextColor(primaryTextColor);
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+            binding.readPostsLimitTextInputLayoutPostHistoryFragment.setCursorColor(ColorStateList.valueOf(primaryTextColor));
+        } else {
+            setCursorDrawableColor(binding.readPostsLimitTextInputEditTextPostHistoryFragment, primaryTextColor);
+        }
+    }
+
+    private void setCursorDrawableColor(EditText editText, int color) {
+        try {
+            Field fCursorDrawableRes = TextView.class.getDeclaredField("mCursorDrawableRes");
+            fCursorDrawableRes.setAccessible(true);
+            int mCursorDrawableRes = fCursorDrawableRes.getInt(editText);
+            Field fEditor = TextView.class.getDeclaredField("mEditor");
+            fEditor.setAccessible(true);
+            Object editor = fEditor.get(editText);
+            Class<?> clazz = editor.getClass();
+            Field fCursorDrawable = clazz.getDeclaredField("mCursorDrawable");
+            fCursorDrawable.setAccessible(true);
+            Drawable[] drawables = new Drawable[2];
+            drawables[0] = editText.getContext().getResources().getDrawable(mCursorDrawableRes);
+            drawables[1] = editText.getContext().getResources().getDrawable(mCursorDrawableRes);
+            drawables[0].setColorFilter(color, PorterDuff.Mode.SRC_IN);
+            drawables[1].setColorFilter(color, PorterDuff.Mode.SRC_IN);
+            fCursorDrawable.set(editor, drawables);
+        } catch (Throwable ignored) { }
     }
 
     @Override
diff --git a/app/src/main/java/ml/docilealligator/infinityforreddit/utils/SharedPreferencesUtils.java b/app/src/main/java/ml/docilealligator/infinityforreddit/utils/SharedPreferencesUtils.java
index b5bb598a..d53657da 100644
--- a/app/src/main/java/ml/docilealligator/infinityforreddit/utils/SharedPreferencesUtils.java
+++ b/app/src/main/java/ml/docilealligator/infinityforreddit/utils/SharedPreferencesUtils.java
@@ -386,6 +386,8 @@ public class SharedPreferencesUtils {
 
     public static final String POST_HISTORY_SHARED_PREFERENCES_FILE = "ml.docilealligator.infinityforreddit.post_history";
     public static final String MARK_POSTS_AS_READ_BASE = "_mark_posts_as_read";
+    public static final String READ_POSTS_LIMIT_ENABLED = "_read_posts_limit_enabled";
+    public static final String READ_POSTS_LIMIT = "_read_posts_limit";
     public static final String MARK_POSTS_AS_READ_AFTER_VOTING_BASE = "_mark_posts_as_read_after_voting";
     public static final String MARK_POSTS_AS_READ_ON_SCROLL_BASE = "_mark_posts_as_read_on_scroll";
     public static final String HIDE_READ_POSTS_AUTOMATICALLY_BASE = "_hide_read_posts_automatically";
diff --git a/app/src/main/res/layout/fragment_post_history.xml b/app/src/main/res/layout/fragment_post_history.xml
index bd0d5ba3..2c3ae592 100644
--- a/app/src/main/res/layout/fragment_post_history.xml
+++ b/app/src/main/res/layout/fragment_post_history.xml
@@ -60,6 +60,61 @@
         </LinearLayout>
 
         <LinearLayout
+            android:id="@+id/read_posts_limit_linear_layout_post_history_fragment"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:background="?attr/selectableItemBackground"
+            android:clickable="true"
+            android:focusable="true"
+            android:orientation="horizontal"
+            android:paddingStart="72dp"
+            android:paddingTop="4dp"
+            android:paddingEnd="16dp"
+            android:paddingBottom="4dp">
+
+            <TextView
+                android:id="@+id/read_posts_limit_text_view_post_history_fragment"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center_vertical"
+                android:layout_marginEnd="16dp"
+                android:layout_weight="1"
+                android:drawablePadding="32dp"
+                android:fontFamily="?attr/font_family"
+                android:text="@string/settings_read_posts_limit_title"
+                android:textColor="?attr/primaryTextColor"
+                android:textSize="?attr/font_16" />
+
+            <com.google.android.material.materialswitch.MaterialSwitch
+                android:id="@+id/read_posts_limit_switch_post_history_fragment"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center_vertical" />
+
+        </LinearLayout>
+
+        <com.google.android.material.textfield.TextInputLayout
+            android:id="@+id/read_posts_limit_text_input_layout_post_history_fragment"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:paddingStart="72dp"
+            android:paddingTop="4dp"
+            android:paddingEnd="16dp"
+            android:paddingBottom="4dp">
+
+            <com.google.android.material.textfield.TextInputEditText
+                android:id="@+id/read_posts_limit_text_input_edit_text_post_history_fragment"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:fontFamily="?attr/font_family"
+                android:hint="@string/settings_read_posts_limit_hint"
+                android:inputType="number"
+                android:maxLines="11"
+                android:textSize="?attr/font_default" />
+
+        </com.google.android.material.textfield.TextInputLayout>
+
+        <LinearLayout
             android:id="@+id/mark_posts_as_read_after_voting_linear_layout_post_history_fragment"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index ac325395..d3b4227d 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -570,6 +570,9 @@
     <string name="settings_enable_search_history_title">Enable Search History</string>
     <string name="settings_post_history_title">Post History</string>
     <string name="settings_mark_posts_as_read_title">Mark Posts as Read</string>
+    <string name="settings_read_posts_limit_title">Limit Read Posts</string>
+    <string name="settings_read_posts_limit_hint">Set read posts limit</string>
+    <string name="settings_read_posts_db_summary">Read Posts DB Table \nSize: %1$d(KB) \nCount: %2$d</string>
     <string name="settings_mark_posts_as_read_after_voting_title">Mark Posts as Read After Voting</string>
     <string name="settings_mark_posts_as_read_on_scroll_title">Mark Posts as Read on Scroll</string>
     <string name="settings_hide_read_posts_automatically_title">Hide Read Posts Automatically</string>
diff --git a/app/src/main/res/xml/advanced_preferences.xml b/app/src/main/res/xml/advanced_preferences.xml
index 538a5f2e..895f6f86 100644
--- a/app/src/main/res/xml/advanced_preferences.xml
+++ b/app/src/main/res/xml/advanced_preferences.xml
@@ -27,7 +27,9 @@
 
     <ml.docilealligator.infinityforreddit.customviews.CustomFontPreference
         app:key="delete_read_posts_in_database"
-        app:title="@string/settings_delete_read_posts_in_database_title" />
+        app:title="@string/settings_delete_read_posts_in_database_title"
+        app:summary=""
+    />
 
     <ml.docilealligator.infinityforreddit.customviews.CustomFontPreference
         app:key="delete_all_legacy_settings"