No result of the query

Hello, my name is Sofya
I was trying to run an example from this link on Visual Studio Code:
https://codeql.github.com/docs/codeql-language-guides/analyzing-data-flow-in-javascript-and-typescript/#analyzing-data-flow-in-javascript-and-typescript
I created a database of Node.js library manually and added it to Visual Studio Code and it is activated.
My query look like that:

/**
* @kind path-problem
*/

import javascript
import DataFlow::PathGraph

class CommandLineFileNameConfiguration extends TaintTracking::Configuration {
CommandLineFileNameConfiguration() { this = "CommandLineFileNameConfiguration" }

override predicate isSource(DataFlow::Node source) {
DataFlow::globalVarRef("process").getAPropertyRead("argv").getAPropertyRead() = source
}

override predicate isSink(DataFlow::Node sink) {
DataFlow::moduleMember("fs", "readFile").getACall().getArgument(0) = sink
}
}

from CommandLineFileNameConfiguration cfg, DataFlow::Node source, DataFlow::Node sink
where cfg.hasFlow(source, sink)
select sink, source, sink, ""

Unfortunately this query is not giving any results. (no errors occured)
Can you help me with it please? Maybe the problem is in database?

Start with the linked CodeQL data-flow guide, then compare the query's source and sink predicates with the manually created Node.js database in Visual Studio Code. Check whether the database contains the referenced process.argv and fs.readFile flow. Done means explaining why no results appear or identifying the database/query mismatch.

Written by the indexing model from the issue text.