Initial bot functionality

* The bot now properly joins the management room
* The management room is persisted in the database
* Welcome/help messages are sent in the management room

database/puppetquery.go

@@ -0,0 +1,28 @@
+package database
+
+import (
+	log "maunium.net/go/maulogger/v2"
+)
+
+type PuppetQuery struct {
+	db  *Database
+	log log.Logger
+}
+
+func (pq *PuppetQuery) New() *Puppet {
+	return &Puppet{
+		db:  pq.db,
+		log: pq.log,
+
+		EnablePresence: true,
+	}
+}
+
+func (pq *PuppetQuery) Get(id string) *Puppet {
+	row := pq.db.QueryRow("SELECT id, displayname, avatar, avatar_url, enable_presence FROM puppet WHERE id=$1", id)
+	if row == nil {
+		return nil
+	}
+
+	return pq.New().Scan(row)
+}