diff --git a/crawler/src/Db/Revision/ForumModeratorRevision.cs b/crawler/src/Db/Revision/ForumModeratorRevision.cs
index 2349ca2c..7d49430c 100644
--- a/crawler/src/Db/Revision/ForumModeratorRevision.cs
+++ b/crawler/src/Db/Revision/ForumModeratorRevision.cs
@@ -4,10 +4,10 @@ namespace tbm.Crawler.Db.Revision
 {
     public class ForumModeratorRevision
     {
+        [Key] public uint Id { get; set; }
         public uint Time { get; set; }
         public uint Fid { get; set; }
-        public long Uid { get; set; }
         public string Portrait { get; set; } = "";
-        public string? Type { get; set; }
+        public string? ModeratorType { get; set; }
     }
 }
diff --git a/crawler/src/Db/TbmDbContext.cs b/crawler/src/Db/TbmDbContext.cs
index a1c3cdc5..6f2939d8 100644
--- a/crawler/src/Db/TbmDbContext.cs
+++ b/crawler/src/Db/TbmDbContext.cs
@@ -42,7 +42,7 @@ protected override void OnModelCreating(ModelBuilder b)
             b.Entity<SubReplyRevision>().ToTable("tbmc_revision_subReply").HasKey(e => new {e.Spid, e.Time});
             b.Entity<UserRevision>().ToTable("tbmc_revision_user").HasKey(e => new {e.Uid, e.Time});
             b.Entity<AuthorExpGradeRevision>().ToTable("tbmc_revision_authorExpGrade").HasKey(e => new {e.Fid, e.Uid, e.Time});
-            b.Entity<ForumModeratorRevision>().ToTable("tbmc_revision_forumModerator").HasKey(e => new {e.Fid, e.Uid, e.Time});
+            b.Entity<ForumModeratorRevision>().ToTable("tbmc_revision_forumModerator");
             b.Entity<Forum>().ToTable("tbm_forum");
         }
 
diff --git a/crawler/src/Program.cs b/crawler/src/Program.cs
index 93728be3..05cbf9a1 100644
--- a/crawler/src/Program.cs
+++ b/crawler/src/Program.cs
@@ -28,6 +28,7 @@ private static async Task Main()
                     {
                         service.AddHostedService<MainCrawlWorker>();
                         service.AddHostedService<RetryCrawlWorker>();
+                        service.AddHostedService<ForumModeratorRevisionCrawlWorker>();
                         var httpConfig = context.Configuration.GetSection("ClientRequester");
                         service.AddHttpClient("tbClient", client =>
                             {
diff --git a/crawler/src/Tieba/Crawl/Facade/ThreadArchiveCrawlFacade.cs b/crawler/src/Tieba/Crawl/Facade/ThreadArchiveCrawlFacade.cs
index fa6ce5ab..3e5671db 100644
--- a/crawler/src/Tieba/Crawl/Facade/ThreadArchiveCrawlFacade.cs
+++ b/crawler/src/Tieba/Crawl/Facade/ThreadArchiveCrawlFacade.cs
@@ -4,7 +4,7 @@ public class ThreadArchiveCrawlFacade : ThreadCrawlFacade
     {
         public new delegate ThreadArchiveCrawlFacade New(Fid fid, string forumName);
 
-        public ThreadArchiveCrawlFacade(ILogger<ThreadCrawlFacade> logger, TbmDbContext.New dbContextFactory,
+        public ThreadArchiveCrawlFacade(ILogger<ThreadArchiveCrawlFacade> logger, TbmDbContext.New dbContextFactory,
             ThreadArchiveCrawler.New crawler, ThreadParser parser, ThreadSaver.New saver, UserParserAndSaver users,
             ClientRequesterTcs requesterTcs, IIndex<string, CrawlerLocks> locks, Fid fid, string forumName
         ) : base(logger, dbContextFactory, crawler.Invoke, parser, saver, users, requesterTcs, locks, fid, forumName) { }
diff --git a/crawler/src/Worker/ForumModeratorRevisionCrawlWorker.cs b/crawler/src/Worker/ForumModeratorRevisionCrawlWorker.cs
index c4a8a510..5ec6e9db 100644
--- a/crawler/src/Worker/ForumModeratorRevisionCrawlWorker.cs
+++ b/crawler/src/Worker/ForumModeratorRevisionCrawlWorker.cs
@@ -1,26 +1,23 @@
 using AngleSharp;
+using LinqToDB;
+using LinqToDB.EntityFrameworkCore;
 using IConfiguration = Microsoft.Extensions.Configuration.IConfiguration;
 
 namespace tbm.Crawler.Worker
 {
     public class ForumModeratorRevisionCrawlWorker : CyclicCrawlWorker
     {
-        private readonly ILogger<MainCrawlWorker> _logger;
         private readonly ILifetimeScope _scope0;
 
-        public ForumModeratorRevisionCrawlWorker(ILogger<MainCrawlWorker> logger,
-            IConfiguration config, ILifetimeScope scope0) : base(logger, config)
-        {
-            _logger = logger;
-            _scope0 = scope0;
-        }
+        public ForumModeratorRevisionCrawlWorker(ILogger<ForumModeratorRevisionCrawlWorker> logger,
+            IConfiguration config, ILifetimeScope scope0) : base(logger, config, false) => _scope0 = scope0;
 
         protected override async Task DoWork(CancellationToken stoppingToken)
         {
             await using var scope1 = _scope0.BeginLifetimeScope();
-            var db = scope1.Resolve<TbmDbContext.New>()(0);
+            var db0 = scope1.Resolve<TbmDbContext.New>()(0);
             var browsing = BrowsingContext.New(Configuration.Default.WithDefaultLoader());
-            foreach (var forum in from f in db.Forum where f.IsCrawling select new {f.Fid, f.Name})
+            foreach (var forum in from f in db0.Forum.AsNoTracking() where f.IsCrawling select new {f.Fid, f.Name})
             {
                 if (stoppingToken.IsCancellationRequested) return;
                 var doc = await browsing.OpenAsync($"https://tieba.baidu.com/bawu2/platform/listBawuTeamInfo?ie=utf-8&word={forum.Name}", stoppingToken);
@@ -38,6 +35,43 @@ protected override async Task DoWork(CancellationToken stoppingToken)
                         .OfType<string>();
                     return memberPortraits.Select(portrait => (type, portrait));
                 });
+
+                var fid = forum.Fid;
+                var now = (Time)DateTimeOffset.Now.ToUnixTimeSeconds();
+                await using var db1 = scope1.Resolve<TbmDbContext.New>()(0);
+                await using var transaction = await db1.Database.BeginTransactionAsync(IsolationLevel.ReadCommitted, stoppingToken);
+                var revisions = moderators.SelectMany(i => i).Select(tuple => new ForumModeratorRevision
+                {
+                    Time = now,
+                    Fid = fid,
+                    Portrait = tuple.portrait,
+                    ModeratorType = tuple.type
+                }).ToList();
+                var existingLatestRevisions = (from r in db1.ForumModeratorRevisions.AsNoTracking()
+                    where r.Fid == fid
+                    select new
+                    {
+                        r.Time,
+                        r.Portrait,
+                        r.ModeratorType,
+                        Rank = Sql.Ext.Rank().Over().PartitionBy(r.Portrait).OrderByDesc(r.Time).ToValue()
+                    }).Where(e => e.Rank == 1).ToLinqToDB().ToList();
+
+                db1.ForumModeratorRevisions.AddRange(revisions.ExceptBy(
+                    existingLatestRevisions.Select(e => (e.Portrait, e.ModeratorType)),
+                    r => (r.Portrait, r.ModeratorType)));
+                db1.ForumModeratorRevisions.AddRange(existingLatestRevisions.ExceptBy(
+                    revisions.Select(r => (r.Portrait, r.ModeratorType)),
+                    e => (e.Portrait, e.ModeratorType))
+                    .Select(e => new ForumModeratorRevision
+                    {
+                        Time = now,
+                        Fid = fid,
+                        Portrait = e.Portrait,
+                        ModeratorType = null // moderator only exists in db means he is no longer a moderator
+                    }));
+                _ = await db1.SaveChangesAsync(stoppingToken);
+                await transaction.CommitAsync(stoppingToken);
             }
         }
     }