Replace Web Push and its service worker with page notifications over SSE

internal/store/notifications.go

@@ -0,0 +1,27 @@
+package store
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+
+	"g.fc.run/misc/byre/internal/api"
+)
+
+func (s *Store) UpdateNotificationPrefs(ctx context.Context, login string, prefs api.NotificationPrefs) (api.User, error) {
+	b, err := json.Marshal(prefs)
+	if err != nil {
+		return api.User{}, err
+	}
+	err = s.write(ctx, func(tx *sql.Tx, emit emitFunc) error {
+		_, err := tx.ExecContext(ctx, `UPDATE users SET notification_prefs = ? WHERE login = ?`, string(b), login)
+		if err != nil {
+			return err
+		}
+		return emit(api.Event{Kind: "user.updated", Actor: login, Payload: map[string]any{"login": login}})
+	})
+	if err != nil {
+		return api.User{}, err
+	}
+	return s.GetUser(ctx, login)
+}