Filter to the last Database version (list.max?)

I'm not 100% clear what you need micsafdas but look at this:

From that, I can just keep the data that is related to the max value in the version column using this code:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjIwMjCwUNJRAlEKJanFJUqxOlBhc4iwOZowmupYAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Version = _t, OP_Name = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Version", Int64.Type}}),
    MaxValue =
        List.Distinct(
            Table.SelectRows(
                #"Changed Type",
                each
                    let
                        varMaxItem = List.Max(#"Changed Type"[Version])
                    in
                    
                    [Version] = varMaxItem
            )[OP_Name]
        ),
    TotalData = 
        Table.SelectRows(
            #"Changed Type",
            each List.Contains(MaxValue, [OP_Name])
        )
in
    TotalData

The MaxValue step finds the value for the OP_Name that is represented by the max value in the Value column.

The TotalData step filters the original table at #Changed Step by the text returned by the MaxValue step.

This is the result:

If that isn't what you need, please provide sample data with a clear explanation of expected output.

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Hello micsafdas 

Hope I got you right... not quite clear, what you exactly need

you can group your data by OP_Name and apply a Table.Max on your version-column. After that you expand the record found. Here an example

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjIwMjAwV9JRclSK1aE+1wLIdcLJtYRwYwE=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Version = _t, OP_Name = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Version", Int64.Type}, {"OP_Name", type text}}),
    #"Grouped Rows" = Table.Group(#"Changed Type", {"OP_Name"}, {{"AllRows", each Table.Max(_,"Version") }}),
    #"Expanded AllRows" = Table.ExpandRecordColumn(#"Grouped Rows", "AllRows", {"Version"}, {"Version"})
in
    #"Expanded AllRows"

Copy paste this code to the advanced editor in a new blank query to see how the solution works.

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Have fun

Jimmy