# What this PR does
Fixes https://github.com/grafana/oncall/issues/1103, inspired by
https://github.com/grafana/oncall/pull/1934.
Makes sure that:
1. `LiveSettings.validate_settings` is only called once per update
request and not called for any individual LiveSetting instance save.
2. `telegram.Bot.set_webhook` is only called once per request when
changing `TELEGRAM_WEBHOOK_HOST`.
## Which issue(s) this PR fixes
https://github.com/grafana/oncall/issues/1103
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)
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