refactor: improve code quality (#8751)

* 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.

packages/backend/src/services/chart/core.ts

@@ -91,27 +91,20 @@ type ToJsonSchema<S> = {
 };
 
 export function getJsonSchema<S extends Schema>(schema: S): ToJsonSchema<Unflatten<ChartResult<S>>> {
-	const object = {};
-	for (const [k, v] of Object.entries(schema)) {
-		nestedProperty.set(object, k, null);
-	}
+	const jsonSchema = {
+		type: 'object',
+		properties: {} as Record<string, unknown>,
+		required: [],
+	};
 
-	function f(obj: Record<string, null | Record<string, unknown>>) {
-		const jsonSchema = {
-			type: 'object',
-			properties: {} as Record<string, unknown>,
-			required: [],
+	for (const k in schema) {
+		jsonSchema.properties[k] = {
+			type: 'array',
+			items: { type: 'number' },
 		};
-		for (const [k, v] of Object.entries(obj)) {
-			jsonSchema.properties[k] = v === null ? {
-				type: 'array',
-				items: { type: 'number' },
-			} : f(v as Record<string, null | Record<string, unknown>>);
-		}
-		return jsonSchema;
 	}
 
-	return f(object) as ToJsonSchema<Unflatten<ChartResult<S>>>;
+	return jsonSchema as ToJsonSchema<Unflatten<ChartResult<S>>>;
 }
 
 /**