public async Task SetPrefix(ulong guildId, string prefix)
{
var localVariables = await variables.GetGlobalVariableSet(guildId, "bot-prefix");
localVariables.Upsert("bot-prefix", prefix);
await variables.SetGlobalVariableSet(guildId, localVariables);
if (this.cachedPrefixes.ContainsKey(guildId))
{
this.cachedPrefixes[guildId] = prefix;
}
}
