On Windows, noise input from a bad/old gamepad causes ActivityWatch to think that the user is not AFK. But if this happens in all-windows-minimized/lockscreen/screensaving states, the window title will be empty. So, we can just delete such events, but for this to work better, develop a habit of minimizing everything and/or reduce time before loc…

delete events with empty title from ActivityWatch.ps1

$bucket = 'aw-watcher-window_MainPC-W10P'

'Getting events…'

# Limiting to about 512 during experimenting is quicker (and safer) to work this.
# Once you're sure that everything works as needed, you can just comment it out
# (note that initialization will take a few minutes in that case).
$events = Invoke-RestMethod -Uri ("http://localhost:5600/api/0/buckets/$bucket/events"<#  + '?limit=512' #>)

"Number of events received: $($events.Length)…"

$hashTable = @{}

foreach ($e in $events) {
    if ($e.data.title -match '^$') {
        $hashTable[$e.data.app] ??= @()
        $hashTable[$e.data.app] += $e
    }
}

if ($hashTable.Count -eq 0) {
    'Nothing found.'
} else {
    'Found this many events with empty titles:'
    $hashTable | Format-Table @{Label='App'; Expression={$_.Key}}, @{Label='Count'; Expression={$_.Value.Length}}
    Pause
}

$invokeDeleteMethod = {
    param (
        # A single event, one of those gotten using REST Method.
        [Parameter(Mandatory)]
        $e,
        # The name/ID of the bucket.
        [Parameter(Mandatory)]
        [string]
        $bucket
    )

    # ("http://localhost:5600/api/0/buckets/$bucket/events/$($e.id)")
  
    $response = Invoke-RestMethod -Uri "http://localhost:5600/api/0/buckets/$bucket/events/$($e.id)" -Method Delete
    if ($response.success -ne 1) {
        "Failed to delete event $($e.data) because '$response'."
    }
    else {
        #"Deleted event: $($e.data)."
        Write-Host -NoNewline "."
    }
}

'Creating delete jobs…'

$jobs = foreach ($array in $hashTable.Values) {
    foreach ($e in $array) {
        Start-ThreadJob -ScriptBlock $invokeDeleteMethod -ArgumentList $e, $bucket
    }
}

"Jobs created: $($jobs.Count)…"

if ($jobs) {
    Receive-Job -Job $jobs -AutoRemoveJob -Wait
    ''
}
else {
    'Nothing done.'
}

# Note about aw-server-rust:
# It doesn’t seem to support deleting events yet, so aw-server must be used instead.
# (Namely, the `Invoke-RestMethod ... Delete` results in an empty string.)

# Note that PS6 or newer are assumed.
# If you don’t have PS6+:
# 1. replace `??=` operator with comparing with $null in an `if`
# 2. simply replace `Start-ThreadJob` with `Start-Job` or rewrite to completely get rid of parallelism
#       (however, both seem to be very much slower)

# Maintainability:
# The jobs are a bit of error-prone mine-field, be careful with editing code involving them: https://stackoverflow.com/a/76847044/776442.

# Implementation note:
# The `foreach` statement is better than ForEach-Object command or ForEach() method
# because it gives full freedom, including producing smaller array or nothing at all,
# while the alternatives do strict mapping, i.e. produce array of the same size
# (i.e. skipped elements are $null instead of not existing at all).

# Links:
# - inspired by: https://forum.activitywatch.net/t/add-an-exclude-list/345/17
# - possible optimizations: https://docs.activitywatch.net/en/latest/api/python.html#module-aw_transform
#   (the link is about Python but this API is mostly mirrored to REST, AFAIK)