# What this PR does
This PR should allow us to start working on _most_ of the remaining
tasks for this feature set.
- Adds a basic `ShiftSwapRequest` model + CRUD endpoints.
- Adds a `POST /api/internal/v1/shift_swaps/<id>/take` endpoint which
allows a benefactor to take a request (only when certain conditions
about the ssr are met)
Closes#2587
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required) will be done in #2589
- [x] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required) (will update once we ship the finalized feature set)
* Centralize timezone validation into one spot + add serializer validation
for schedules and oncall shifts (both public and internal API)
* add engine-manage make command
