appview/db: close once done

Signed-off-by: oppiliappan <[e-mail]>

appview/db/db.go

···
 	return nil
 }
 
+func (d *DB) Close() error {
+	return d.DB.Close()
+}
+
 type filter struct {
 	key string
 	arg any

appview/state/state.go

···
 	return state, nil
 }
 
+func (s *State) Close() error {
+	// other close up logic goes here
+	return s.db.Close()
+}
+
 func (s *State) Favicon(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "image/svg+xml")
 	w.Header().Set("Cache-Control", "public, max-age=31536000") // one year

cmd/appview/main.go

···
 	}
 
 	state, err := state.Make(ctx, c)
+	defer func() {
+		log.Println(state.Close())
+	}()
 
 	if err != nil {
 		log.Fatal(err)