Neo4J Cypher - Find integer attributes - neo4j

Question

Background
I have nodes which have been recording a specific attribute as LONG and I want them to be recorded as INT - I have amended my system's input code to now record them as INT, however I am looking to check Neo4J for anomalies.
The Data
I now have a mix of data, where some have been created as "int" some as STR and some are even null (which is ok in my data-structure)
CREATE (n:logs{value: "example", records: "30"})
, (n:logs{value: "example", records: 30})
, (n:logs{value: "example", records: null})
RETURN n
The Problem
I tried to verify if the system is now writing the "records" attribute as INT rather than string, so I tried the following query;
WITH datetime("2021-06-18T06:00:00").epochMillis AS threshold
MATCH(n:logs)
WHERE n.records <> tointeger(n.records)
COUNT(n)
This returns 1 - my NULL record, for some reason. But NOT the STR, as I would have expected.
I then try the following (18th June being the date of the update to my input system);
WITH datetime("2021-06-18T06:00:00").epochMillis AS threshold
MATCH(n:logs)
WHERE n.records = tointeger(n.records)
COUNT(n)
And this returns 0 - which again, I am not sure why.
So my question is, what am I doing wrong and how can I get to where I need to go. Which is ultimately to;
Check the system is saving as INT going forwards
Change all the pre-existing records from STR to INT.
I assume for #2 is will be something like
MATCH(n:logs)
WHERE n.records <> tointeger(n.records)
SET n.records = tointeger(n.records)
Additional Info
Community edition
Version X.x.x
No addins

Answer 1

Your query to update to integer is correct.
To clarify your assumptions, please run below queries in your neo4j desktop or browser and you will see what is going on.
1. RETURN toInteger("2021-06-18T06:00:00")
2. RETURN toInteger(null)
Both of them will return NULL. It means your claim below is NOT true
This returns 1 - my NULL record, for some reason. But NOT the
STR, as I would have expected.
You did return 1 but is it the string value of records ('30') rather than the NULL value.
Then when you run your query below
WHERE n.records = tointeger(n.records)
And this returns 0 - which again, I am not sure why.
It is because the integer value of a string date type is also NULL. Thus it will return no matching record.
If you want to count all nodes with non-integer attribute, including nulls then you can run below query.
MATCH(n:logs)
WHERE n.records <> tointeger(n.records) OR n.records is null
RETURN count(distinct n) as cnt
Result: 2
Remember, if n.records = "2021-06-18T06:00:00" then you need to convert it to an epoch value (the integer value of time in seconds or millis since 1/1/1970). If not, then tointeger(n.records) is null and will not match in your query.
Do something like below:
MATCH (n:logs)
WHERE tointeger(n.records) is null
SET n.records = datetime(n.records).epochMillis
RETURN n
Then do your original query (this is correct!), to clean up other non-integer values.
MATCH(n:logs)
WHERE n.records <> tointeger(n.records)
SET n.records = tointeger(n.records)