Related to #828
- Enable web UI for API/Terraform schedules to add overrides
- Refactor backend to add a flag toggling between web-based and
iCal-based overrides (these options are mutually exclusive)
Also updated read-only tooltips (related to #1483)
# What this PR does
Fixes slow internal`GET /schedules` endpoints. Using the fake-data
generation script in #1128, I generated 65 calendar schedules in my
local setup. This resulted in the following endpoint performance:
The responses which show ~76 queries were run on the latest `dev`
branch. Responses w/ ~26 queries were run on this branch.
Additionally:
- add typing to a few methods in `apps/schedules/ical_utils.py`
- document `apps/api/permissions/__init__.py:user_is_authorized`
function
## Which issue(s) this PR fixes
https://github.com/grafana/oncall-private/issues/1552
## Checklist
- [ ] Tests updated
- [ ] Documentation added
- [ ] `CHANGELOG.md` updated
Co-authored-by: Vadim Stepanov <vadimkerr@gmail.com>
