feat(store): open encrypted SQLite, schema v1, settings

internal/store/settings.go

@@ -0,0 +1,21 @@
+package store
+
+import "database/sql"
+
+// GetSetting returns a setting value or sql.ErrNoRows if absent.
+func (s *Store) GetSetting(name string) (string, error) {
+	var v string
+	err := s.db.QueryRow("SELECT value FROM settings WHERE key = ?", name).Scan(&v)
+	return v, err
+}
+
+// SetSetting upserts a setting.
+func (s *Store) SetSetting(name, value string) error {
+	_, err := s.db.Exec(
+		"INSERT INTO settings(key,value) VALUES(?,?) "+
+			"ON CONFLICT(key) DO UPDATE SET value=excluded.value",
+		name, value)
+	return err
+}
+
+var _ = sql.ErrNoRows