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/puppet.go

@@ -0,0 +1,56 @@
+package database
+
+import (
+	"database/sql"
+
+	log "maunium.net/go/maulogger/v2"
+	"maunium.net/go/mautrix/id"
+)
+
+type Puppet struct {
+	db  *Database
+	log log.Logger
+
+	ID          string
+	DisplayName string
+
+	Avatar    string
+	AvatarURL id.ContentURI
+
+	EnablePresence bool
+}
+
+func (p *Puppet) Scan(row Scannable) *Puppet {
+	var did, displayName, avatar, avatarURL sql.NullString
+	var enablePresence sql.NullBool
+
+	err := row.Scan(&did, &displayName, &avatar, &avatarURL, &enablePresence)
+	if err != nil {
+		if err != sql.ErrNoRows {
+			p.log.Errorln("Database scan failed:", err)
+		}
+
+		return nil
+	}
+
+	p.ID = did.String
+	p.DisplayName = displayName.String
+	p.Avatar = avatar.String
+	p.AvatarURL, _ = id.ParseContentURI(avatarURL.String)
+	p.EnablePresence = enablePresence.Bool
+
+	return p
+}
+
+func (p *Puppet) Insert() {
+	query := "INSERT INTO puppet" +
+		" (id, display_name, avatar, avatar_url, enable_presence)" +
+		" VALUES ($1, $2, $3, $4, $5)"
+
+	_, err := p.db.Exec(query, p.ID, p.DisplayName, p.Avatar,
+		p.AvatarURL.String(), p.EnablePresence)
+
+	if err != nil {
+		p.log.Warnfln("Failed to insert %s: %v", p.ID, err)
+	}
+}