* remove unnecessary if
`Array.prototype.some` already returns a boolean so an if to return
true or false is completely unnecessary in this case.
* perf: use count instead of find
When using `count` instead of `findOneBy`, the data is not
unnecessarily loaded.
* remove duplicate null check
The variable is checked for null in the lines above and the function
returns if so. Therefore, it can not be null at this point.
* simplify `getJsonSchema`
Because the assigned value is `null` and the used keys are only
shallow, use of `nestedProperty.set` seems inappropriate. Because the
value is not read, the initial for loop can be replaced by a `for..in`
loop.
Since all keys will be assigned `null`, the condition of the ternary
expression in the nested function will always be true. Therefore the
recursion case will never happen. With this the nested function can be
eliminated.
* remove duplicate condition
The code above already checks `dragging` and returns if it is truthy.
Checking it again later is therefore unnecessary.
To make this more obvious the `return` is removed in favour of using
an if...else construct.
* remove impossible "unknown" time
The `ago` variable will always be a number and all non-negative numbers
are already covered by other cases, the negative case is handled with
`future` so there is no case when `unkown` could be achieved.
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