feat: add /archiveclean command to purge bad entries

Author: Chrisdbhr

src/Modules/ArchiveModule.cs

@@ -74,6 +74,29 @@ public async Task ShowUserStats(IUser? user = null)
         await FollowupAsync(embed: embed.Build());
     }
 
+    [SlashCommand("archiveclean", "Purge messages that don't meet current archive filters")]
+    [RequireUserPermission(GuildPermission.Administrator)]
+    public async Task CleanArchive()
+    {
+        await DeferAsync(ephemeral: true);
+
+        var before = await _archive.GetArchiveStatsAsync();
+        var deleted = await _archive.PurgeBadEntriesAsync();
+        var after = await _archive.GetArchiveStatsAsync();
+
+        var embed = new EmbedBuilder
+        {
+            Title = "Archive Cleanup",
+            Color = deleted > 0 ? Color.Green : Color.Blue
+        };
+
+        embed.AddField("Deleted", $"{deleted:N0} messages", true);
+        embed.AddField("Before", $"{before.TotalMessages:N0} messages", true);
+        embed.AddField("After", $"{after.TotalMessages:N0} messages", true);
+
+        await FollowupAsync(embed: embed.Build(), ephemeral: true);
+    }
+
     static string FormatFileSize(long bytes) => bytes switch
     {
         < 1024 => $"{bytes} B",

src/Services/MessageArchiveService.cs

@@ -299,6 +299,29 @@ public async Task<ArchiveStats> GetArchiveStatsAsync()
         };
     }
 
+    public async Task<int> PurgeBadEntriesAsync()
+    {
+        await _dbLock.WaitAsync();
+        try
+        {
+            using var ctx = CreateContext();
+            var bad = await ctx.Messages
+                .Where(m => m.Content.Length <= 2 || !char.IsLetter(m.Content[0]))
+                .ToListAsync();
+            var count = bad.Count;
+            if (count > 0)
+            {
+                ctx.Messages.RemoveRange(bad);
+                await ctx.SaveChangesAsync();
+            }
+            return count;
+        }
+        finally
+        {
+            _dbLock.Release();
+        }
+    }
+
     static bool ShouldArchiveContent(string content)
     {
         if (string.IsNullOrEmpty(content)) return false;