Initial split of the modules

NadekoBot.Core/Migrations/MigrationQueries.cs

@@ -0,0 +1,42 @@
+namespace NadekoBot.Migrations
+{
+    internal class MigrationQueries
+    {
+        public static string UserClub { get; } = @"
+CREATE TABLE DiscordUser_tmp(
+    Id INTEGER PRIMARY KEY,
+    AvatarId TEXT,
+    Discriminator TEXT,
+    UserId INTEGER UNIQUE NOT NULL,
+    DateAdded TEXT,
+    Username TEXT
+);
+
+INSERT INTO DiscordUser_tmp
+    SELECT Id, AvatarId, Discriminator, UserId, DateAdded, Username
+    FROM DiscordUser;
+
+DROP TABLE DiscordUser;
+
+CREATE TABLE DiscordUser(
+    Id INTEGER PRIMARY KEY,
+    AvatarId TEXT,
+    Discriminator TEXT,
+    UserId INTEGER UNIQUE NOT NULL,
+    DateAdded TEXT,
+    Username TEXT,
+    ClubId INTEGER,
+    CONSTRAINT FK_DiscordUser_Clubs_ClubId FOREIGN KEY(ClubId) REFERENCES Clubs(Id) ON DELETE RESTRICT
+);
+
+INSERT INTO DiscordUser
+    SELECT Id, AvatarId, Discriminator, UserId, DateAdded, Username, NULL
+    FROM DiscordUser_tmp;
+
+DROP TABLE DiscordUser_tmp;";
+        public static string TotalXp { get; } =
+@"UPDATE DiscordUser
+SET TotalXp = ifnull((SELECT SUM(Xp) FROM UserXpStats WHERE UserId = DiscordUser.UserId), 0)";
+
+    }
+}