handle `Z` in datetime correctly
add `to` GET parameter to `/api/v1/timespans` route
add filter for `start_time`
Revert "Merge branch 'bug/filter_start_time' into 'master'"
use `DatetimeHandler` instead of `datetime.strptime`
set SameSite property to `Lax`
set SameSite property to `Strict`
filter date with `start_time` and not `updated_at`
add `/api/v1/me` route for getting information about the current logged in user
serialize to `None` and not `"None"`
add `from` GET parameter to /api/v1/timespans route (works like `filter_datetime` without JSON body)
use fromisoformat when update_at is str
use timezone UTC instead of no timezone
allow different date format on `filter_datetime`
allow different date formates on start and stop time
check username in request with session
deserialize also on different date format
deserialize also when created_at/updated_at are None