Restructured the project structure back to the way it was, there's no reasonable way to split the modules

src/NadekoBot/Db/Models/roles/ReactionRole.cs

@@ -0,0 +1,18 @@
+#nullable disable
+using System.ComponentModel.DataAnnotations;
+
+namespace Nadeko.Bot.Db.Models;
+
+public class ReactionRoleV2 : DbEntity
+{
+    public ulong GuildId { get; set; }
+    public ulong ChannelId { get; set; }
+    
+    public ulong MessageId { get; set; }
+    
+    [MaxLength(100)]
+    public string Emote { get; set; }
+    public ulong RoleId { get; set; }
+    public int Group { get; set; }
+    public int LevelReq { get; set; }
+}

src/NadekoBot/Db/Models/roles/SelfAssignableRole.cs

@@ -0,0 +1,11 @@
+#nullable disable
+namespace Nadeko.Bot.Db.Models;
+
+public class SelfAssignedRole : DbEntity
+{
+    public ulong GuildId { get; set; }
+    public ulong RoleId { get; set; }
+
+    public int Group { get; set; }
+    public int LevelRequirement { get; set; }
+}

src/NadekoBot/Db/Models/roles/StickyRoles.cs

@@ -0,0 +1,14 @@
+namespace Nadeko.Bot.Db.Models;
+
+#nullable disable
+public class StickyRole : DbEntity
+{
+    public ulong GuildId { get; set; }
+    public string RoleIds { get; set; }
+    public ulong UserId { get; set; }
+
+    public ulong[] GetRoleIds()
+        => string.IsNullOrWhiteSpace(RoleIds)
+            ? []
+            : RoleIds.Split(',').Select(ulong.Parse).ToArray();
+}