diff --git a/crawler/src/Db/Revision/BaseRevision.cs b/crawler/src/Db/Revision/BaseRevision.cs
deleted file mode 100644
index 13360241..00000000
--- a/crawler/src/Db/Revision/BaseRevision.cs
+++ /dev/null
@@ -1,10 +0,0 @@
-// ReSharper disable UnusedAutoPropertyAccessor.Global
-// ReSharper disable PropertyCanBeMadeInitOnly.Global
-namespace tbm.Crawler.Db.Revision
-{
-    public abstract class BaseRevision
-    {
-        public uint TakenAt { get; set; }
-        public ushort? NullFieldsBitMask { get; set; }
-    }
-}
diff --git a/crawler/src/Db/Revision/IRevision.cs b/crawler/src/Db/Revision/IRevision.cs
new file mode 100644
index 00000000..f0996d2b
--- /dev/null
+++ b/crawler/src/Db/Revision/IRevision.cs
@@ -0,0 +1,9 @@
+// ReSharper disable UnusedMember.Global
+namespace tbm.Crawler.Db.Revision
+{
+    public interface IRevision
+    {
+        public uint TakenAt { get; set; }
+        public ushort? NullFieldsBitMask { get; set; }
+    }
+}
diff --git a/crawler/src/Db/Revision/ReplyRevision.cs b/crawler/src/Db/Revision/ReplyRevision.cs
index 8c7249c6..791bdaa5 100644
--- a/crawler/src/Db/Revision/ReplyRevision.cs
+++ b/crawler/src/Db/Revision/ReplyRevision.cs
@@ -1,14 +1,45 @@
 // ReSharper disable PropertyCanBeMadeInitOnly.Global
 namespace tbm.Crawler.Db.Revision
 {
-    public class ReplyRevision : BaseRevision
+    public class ReplyRevision : ReplyRevision.BaseReplyRevision
     {
-        public ulong Pid { get; set; }
-        public uint Floor { get; set; }
-        public uint SubReplyCount { get; set; }
+        public abstract class BaseReplyRevision : RevisionWithSplitting<BaseReplyRevision>
+        {
+            public ulong Pid { get; set; }
+        }
+        [NotMapped] public uint Floor
+        {
+            get => GetSplitEntityValue<SplitFloor, uint>(r => r.Floor);
+            set => SetSplitEntityValue<SplitFloor, uint>(value, (r, v) => r.Floor = v,
+                () => new() {TakenAt = TakenAt, Pid = Pid, Floor = value});
+        }
+        [NotMapped] public uint SubReplyCount
+        {
+            get => GetSplitEntityValue<SplitSubReplyCount, uint>(r => r.SubReplyCount);
+            set => SetSplitEntityValue<SplitSubReplyCount, uint>(value, (r, v) => r.SubReplyCount = v,
+                () => new() {TakenAt = TakenAt, Pid = Pid, SubReplyCount = value});
+        }
         public ushort? IsFold { get; set; }
-        public int AgreeCount { get; set; }
+        [NotMapped] public int AgreeCount
+        {
+            get => GetSplitEntityValue<SplitAgreeCount, int>(r => r.AgreeCount);
+            set => SetSplitEntityValue<SplitAgreeCount, int>(value, (r, v) => r.AgreeCount = v,
+                () => new() {TakenAt = TakenAt, Pid = Pid, AgreeCount = value});
+        }
         public int? DisagreeCount { get; set; }
         public byte[]? Geolocation { get; set; }
+
+        public class SplitFloor : BaseReplyRevision
+        {
+            public uint Floor { get; set; }
+        }
+        public class SplitSubReplyCount : BaseReplyRevision
+        {
+            public uint SubReplyCount { get; set; }
+        }
+        public class SplitAgreeCount : BaseReplyRevision
+        {
+            public int AgreeCount { get; set; }
+        }
     }
 }
diff --git a/crawler/src/Db/Revision/RevisionWithSplitting.cs b/crawler/src/Db/Revision/RevisionWithSplitting.cs
new file mode 100644
index 00000000..eba9cf28
--- /dev/null
+++ b/crawler/src/Db/Revision/RevisionWithSplitting.cs
@@ -0,0 +1,27 @@
+namespace tbm.Crawler.Db.Revision
+{
+    public abstract class RevisionWithSplitting<TSplitEntities> : IRevision
+    {
+        public uint TakenAt { get; set; }
+        public ushort? NullFieldsBitMask { get; set; }
+
+        private Dictionary<Type, TSplitEntities> SplitEntities { get; } = new();
+        public IEnumerable<TSplitEntities> GetSplitEntities() => SplitEntities.Values;
+
+        protected TValue? GetSplitEntityValue<TSplitEntity, TValue>(Func<TSplitEntity, TValue?> valueSelector)
+            where TSplitEntity : class, TSplitEntities =>
+            SplitEntities.ContainsKey(typeof(TSplitEntity))
+                ? valueSelector((TSplitEntity)SplitEntities[typeof(TSplitEntity)]!)
+                : default;
+
+        protected void SetSplitEntityValue<TSplitEntity, TValue>(TValue? value,
+            Action<TSplitEntity, TValue?> valueSetter, Func<TSplitEntity> entityFactory)
+            where TSplitEntity : class, TSplitEntities
+        {
+            if (SplitEntities.ContainsKey(typeof(TSplitEntity)))
+                valueSetter((TSplitEntity)SplitEntities[typeof(TSplitEntity)]!, value);
+            else
+                SplitEntities[typeof(TSplitEntity)] = entityFactory();
+        }
+    }
+}
diff --git a/crawler/src/Db/Revision/SubReplyRevision.cs b/crawler/src/Db/Revision/SubReplyRevision.cs
index 07a97e73..03e054ea 100644
--- a/crawler/src/Db/Revision/SubReplyRevision.cs
+++ b/crawler/src/Db/Revision/SubReplyRevision.cs
@@ -1,10 +1,32 @@
 // ReSharper disable PropertyCanBeMadeInitOnly.Global
 namespace tbm.Crawler.Db.Revision
 {
-    public class SubReplyRevision : BaseRevision
+    public class SubReplyRevision : SubReplyRevision.BaseSubReplyRevision
     {
-        public ulong Spid { get; set; }
-        public int AgreeCount { get; set; }
-        public int DisagreeCount { get; set; }
+        public abstract class BaseSubReplyRevision : RevisionWithSplitting<BaseSubReplyRevision>
+        {
+            public ulong Spid { get; set; }
+        }
+        [NotMapped] public int AgreeCount
+        {
+            get => GetSplitEntityValue<SplitAgreeCount, int>(r => r.AgreeCount);
+            set => SetSplitEntityValue<SplitAgreeCount, int>(value, (r, v) => r.AgreeCount = v,
+                () => new() {TakenAt = TakenAt, Spid = Spid, AgreeCount = value});
+        }
+        [NotMapped] public int DisagreeCount
+        {
+            get => GetSplitEntityValue<SplitDisagreeCount, int>(r => r.DisagreeCount);
+            set => SetSplitEntityValue<SplitDisagreeCount, int>(value, (r, v) => r.DisagreeCount = v,
+                () => new() {TakenAt = TakenAt, Spid = Spid, DisagreeCount = value});
+        }
+
+        public class SplitAgreeCount : BaseSubReplyRevision
+        {
+            public int AgreeCount { get; set; }
+        }
+        public class SplitDisagreeCount : BaseSubReplyRevision
+        {
+            public int DisagreeCount { get; set; }
+        }
     }
 }
diff --git a/crawler/src/Db/Revision/ThreadRevision.cs b/crawler/src/Db/Revision/ThreadRevision.cs
index 44733426..0725c0b9 100644
--- a/crawler/src/Db/Revision/ThreadRevision.cs
+++ b/crawler/src/Db/Revision/ThreadRevision.cs
@@ -1,9 +1,12 @@
 // ReSharper disable PropertyCanBeMadeInitOnly.Global
 namespace tbm.Crawler.Db.Revision
 {
-    public class ThreadRevision : BaseRevision
+    public class ThreadRevision : ThreadRevision.BaseThreadRevision
     {
-        public ulong Tid { get; set; }
+        public abstract class BaseThreadRevision : RevisionWithSplitting<BaseThreadRevision>
+        {
+            public ulong Tid { get; set; }
+        }
         public ulong? ThreadType { get; set; }
         public string? StickyType { get; set; }
         public string? TopicType { get; set; }
@@ -11,10 +14,20 @@ public class ThreadRevision : BaseRevision
         public uint? LatestReplyPostedAt { get; set; }
         public long? LatestReplierUid { get; set; }
         public uint? ReplyCount { get; set; }
-        public uint ViewCount { get; set; }
+        [NotMapped] public uint ViewCount
+        {
+            get => GetSplitEntityValue<SplitViewCount, uint>(r => r.ViewCount);
+            set => SetSplitEntityValue<SplitViewCount, uint>(value, (r, v) => r.ViewCount = v,
+                () => new() {TakenAt = TakenAt, Tid = Tid, ViewCount = value});
+        }
         public uint? ShareCount { get; set; }
         public int? AgreeCount { get; set; }
         public int? DisagreeCount { get; set; }
         public byte[]? Geolocation { get; set; }
+
+        public class SplitViewCount : BaseThreadRevision
+        {
+            public uint ViewCount { get; set; }
+        }
     }
 }
diff --git a/crawler/src/Db/Revision/UserRevision.cs b/crawler/src/Db/Revision/UserRevision.cs
index 4da0a30e..7ef56503 100644
--- a/crawler/src/Db/Revision/UserRevision.cs
+++ b/crawler/src/Db/Revision/UserRevision.cs
@@ -2,16 +2,47 @@
 // ReSharper disable PropertyCanBeMadeInitOnly.Global
 namespace tbm.Crawler.Db.Revision
 {
-    public class UserRevision : BaseRevision
+    public class UserRevision : UserRevision.BaseUserRevision
     {
-        public long Uid { get; set; }
-        public string TriggeredBy { get; set; } = "";
+        public abstract class BaseUserRevision : RevisionWithSplitting<BaseUserRevision>
+        {
+            public long Uid { get; set; }
+            public string TriggeredBy { get; set; } = "";
+        }
         public string? Name { get; set; }
-        public string? DisplayName { get; set; }
+        [NotMapped] public string? DisplayName
+        {
+            get => GetSplitEntityValue<SplitDisplayName, string?>(r => r.DisplayName);
+            set => SetSplitEntityValue<SplitDisplayName, string?>(value, (r, v) => r.DisplayName = v,
+                () => new() {TakenAt = TakenAt, Uid = Uid, TriggeredBy = TriggeredBy, DisplayName = value});
+        }
         public string? Portrait { get; set; }
-        public uint? PortraitUpdatedAt { get; set; }
+        [NotMapped] public uint? PortraitUpdatedAt
+        {
+            get => GetSplitEntityValue<SplitPortraitUpdatedAt, uint?>(r => r.PortraitUpdatedAt);
+            set => SetSplitEntityValue<SplitPortraitUpdatedAt, uint?>(value, (r, v) => r.PortraitUpdatedAt = v,
+                () => new() {TakenAt = TakenAt, Uid = Uid, TriggeredBy = TriggeredBy, PortraitUpdatedAt = value});
+        }
         public ushort? Gender { get; set; }
         public byte[]? Icon { get; set; }
-        public string? IpGeolocation { get; set; }
+        [NotMapped] public string? IpGeolocation
+        {
+            get => GetSplitEntityValue<SplitIpGeolocation, string?>(r => r.IpGeolocation);
+            set => SetSplitEntityValue<SplitIpGeolocation, string?>(value, (r, v) => r.IpGeolocation = v,
+                () => new() {TakenAt = TakenAt, Uid = Uid, TriggeredBy = TriggeredBy, IpGeolocation = value});
+        }
+
+        public class SplitDisplayName : BaseUserRevision
+        {
+            public string? DisplayName { get; set; }
+        }
+        public class SplitPortraitUpdatedAt : BaseUserRevision
+        {
+            public uint? PortraitUpdatedAt { get; set; }
+        }
+        public class SplitIpGeolocation : BaseUserRevision
+        {
+            public string? IpGeolocation { get; set; }
+        }
     }
 }
diff --git a/crawler/src/Db/TbmDbContext.cs b/crawler/src/Db/TbmDbContext.cs
index a5290ff8..1eb44006 100644
--- a/crawler/src/Db/TbmDbContext.cs
+++ b/crawler/src/Db/TbmDbContext.cs
@@ -40,35 +40,19 @@ protected override void OnModelCreating(ModelBuilder b)
             b.Entity<ReplyContent>().ToTable($"tbmc_f{Fid}_reply_content");
             b.Entity<SubReplyPost>().ToTable($"tbmc_f{Fid}_subReply");
             b.Entity<SubReplyContent>().ToTable($"tbmc_f{Fid}_subReply_content");
-            b.Entity<ThreadRevision>()
-                .SplitToTable("tbmc_revision_thread_viewCount", tb => tb.Property(e => e.ViewCount))
-                .ToTable("tbmc_revision_thread").HasKey(e => new {e.Tid, e.TakenAt});
-            b.Entity<ReplyRevision>()
-                .SplitToTable("tbmc_revision_reply_agreeCount", tb => tb.Property(e => e.AgreeCount))
-                .SplitToTable("tbmc_revision_reply_subReplyCount", tb => tb.Property(e => e.SubReplyCount))
-                .SplitToTable("tbmc_revision_reply_floor", tb => tb.Property(e => e.Floor))
-                .ToTable("tbmc_revision_reply").HasKey(e => new {e.Pid, e.TakenAt});
-            b.Entity<SubReplyRevision>()
-                .SplitToTable("tbmc_revision_subReply_agreeCount", tb => tb.Property(e => e.AgreeCount))
-                .SplitToTable("tbmc_revision_subReply_disagreeCount", tb => tb.Property(e => e.DisagreeCount))
-                .ToTable("tbmc_revision_subReply").HasKey(e => new {e.Spid, e.TakenAt});
-            b.Entity<UserRevision>()
-                .SplitToTable("tbmc_revision_user_ipGeolocation", tb =>
-                {
-                    tb.Property(e => e.TriggeredBy);
-                    tb.Property(e => e.IpGeolocation);
-                })
-                .SplitToTable("tbmc_revision_user_portraitUpdatedAt", tb =>
-                {
-                    tb.Property(e => e.TriggeredBy);
-                    tb.Property(e => e.PortraitUpdatedAt);
-                })
-                .SplitToTable("tbmc_revision_user_displayName", tb =>
-                {
-                    tb.Property(e => e.TriggeredBy);
-                    tb.Property(e => e.DisplayName);
-                })
-                .ToTable("tbmc_revision_user").HasKey(e => new {e.Uid, e.TakenAt});
+            b.Entity<ThreadRevision>().ToTable("tbmc_revision_thread").HasKey(e => new {e.Tid, e.TakenAt});
+            b.Entity<ThreadRevision.SplitViewCount>().ToTable("tbmc_revision_thread_viewCount").HasKey(e => new {e.Tid, e.TakenAt});
+            b.Entity<ReplyRevision>().ToTable("tbmc_revision_reply").HasKey(e => new {e.Pid, e.TakenAt});
+            b.Entity<ReplyRevision.SplitAgreeCount>().ToTable("tbmc_revision_reply_agreeCount").HasKey(e => new {e.Pid, e.TakenAt});
+            b.Entity<ReplyRevision.SplitSubReplyCount>().ToTable("tbmc_revision_reply_subReplyCount").HasKey(e => new {e.Pid, e.TakenAt});
+            b.Entity<ReplyRevision.SplitFloor>().ToTable("tbmc_revision_reply_floor").HasKey(e => new {e.Pid, e.TakenAt});
+            b.Entity<SubReplyRevision>().ToTable("tbmc_revision_subReply").HasKey(e => new {e.Spid, e.TakenAt});
+            b.Entity<SubReplyRevision.SplitAgreeCount>().ToTable("tbmc_revision_subReply_agreeCount").HasKey(e => new {e.Spid, e.TakenAt});
+            b.Entity<SubReplyRevision.SplitDisagreeCount>().ToTable("tbmc_revision_subReply_disagreeCount").HasKey(e => new {e.Spid, e.TakenAt});
+            b.Entity<UserRevision>().ToTable("tbmc_revision_user").HasKey(e => new {e.Uid, e.TakenAt});
+            b.Entity<UserRevision.SplitIpGeolocation>().ToTable("tbmc_revision_user_ipGeolocation").HasKey(e => new {e.Uid, e.TakenAt});
+            b.Entity<UserRevision.SplitPortraitUpdatedAt>().ToTable("tbmc_revision_user_portraitUpdatedAt").HasKey(e => new {e.Uid, e.TakenAt});
+            b.Entity<UserRevision.SplitDisplayName>().ToTable("tbmc_revision_user_displayName").HasKey(e => new {e.Uid, e.TakenAt});
             b.Entity<AuthorExpGradeRevision>().ToTable("tbmc_revision_authorExpGrade").HasKey(e => new {e.Fid, e.Uid, e.DiscoveredAt});
             b.Entity<ForumModeratorRevision>().ToTable("tbmc_revision_forumModerator");
             b.Entity<Forum>().ToTable("tbm_forum");
diff --git a/crawler/src/Tieba/Crawl/Saver/BaseSaver.cs b/crawler/src/Tieba/Crawl/Saver/BaseSaver.cs
index 23f4049d..9a274e0d 100644
--- a/crawler/src/Tieba/Crawl/Saver/BaseSaver.cs
+++ b/crawler/src/Tieba/Crawl/Saver/BaseSaver.cs
@@ -33,7 +33,7 @@ protected SaverChangeSet<TPost> SavePosts<TRevision>(TbmDbContext db,
             ExpressionStarter<TPost> existingPostPredicate,
             Func<IEnumerable<TRevision>, Expression<Func<TRevision, bool>>> existingRevisionPredicate,
             Expression<Func<TRevision, TRevision>> revisionKeySelector)
-            where TRevision : BaseRevision, new()
+            where TRevision : class, IRevision, new()
         {
             var dbSet = db.Set<TPost>().TagWith("ForUpdate");
             if (dbSet == null) throw new ArgumentException(
diff --git a/crawler/src/Tieba/Crawl/Saver/CommonInSavers.cs b/crawler/src/Tieba/Crawl/Saver/CommonInSavers.cs
index 8a12e0d7..c763226b 100644
--- a/crawler/src/Tieba/Crawl/Saver/CommonInSavers.cs
+++ b/crawler/src/Tieba/Crawl/Saver/CommonInSavers.cs
@@ -19,9 +19,10 @@ protected void SavePostsOrUsers<TPostOrUser, TRevision>(
             Func<TRevision, long> revisionPostOrUserIdSelector,
             Func<IEnumerable<TRevision>, Expression<Func<TRevision, bool>>> existingRevisionPredicate,
             Expression<Func<TRevision, TRevision>> revisionKeySelector)
-            where TPostOrUser : class where TRevision : BaseRevision, new()
+            where TPostOrUser : class where TRevision : class, IRevision, new()
         {
             db.Set<TPostOrUser>().AddRange(existingOrNewLookup[false]); // newly added
+            db.TimestampingEntities();
             var newRevisions = existingOrNewLookup[true].Select(newPostOrUser =>
             {
                 var postOrUserInTracking = existingSelector(newPostOrUser);
@@ -101,7 +102,11 @@ or nameof(ITimestampingEntity.CreatedAt)
                 if (revision != null) revision.NullFieldsBitMask = (ushort?)revisionNullFieldsBitMask;
                 return revision;
             }).OfType<TRevision>().ToList();
-            db.TimestampingEntities();
+
+            db.AddRange(newRevisions.OfType<ThreadRevision>().Select(r => r.GetSplitEntities()));
+            db.AddRange(newRevisions.OfType<ReplyRevision>().Select(r => r.GetSplitEntities()));
+            db.AddRange(newRevisions.OfType<SubReplyRevision>().Select(r => r.GetSplitEntities()));
+            db.AddRange(newRevisions.OfType<UserRevision>().Select(r => r.GetSplitEntities()));
 
             if (!newRevisions.Any()) return; // quick exit to prevent execute sql with WHERE FALSE clause
             var existingRevisions = db.Set<TRevision>()