How to reduce the issues amount witout delete them to save space or is there any other tips on reducing data in YouTrack

@Sergey Merzlov 
Thanks for your answer i have taken the API route to delete attachments.
The problem is that each member of the organization that is mentioned in the issue getting an email when i delete and add a comment ( comment with info on deleting ) . so they can get Dozens of emails as I'm looping throw Thousands of issues 
is there any way to disable sending email when i do the delete + comment API call? 
Thanks

Thanks for your reply. 

I'm afraid it is not possible to disable notifications when deleting the attachments via REST API. Yet, if that's a priority, then I suggest opting in for a workflow approach. 

You can create an on-schedule rule that will be executed once and remove the attachments. For example, ctx.issue.attachments contains a set of the issue's attachments. You can iterate through this set and remove the attachments using the delete() method. 

For instance, the following code will delete all issue's attachments:

ctx.issue.attachments.forEach(function(file) {
      file.delete();
    });

To disable notifications, an on-schedule rule has a property muteUpdateNotifications For more information, please refer to https://www.jetbrains.com/help/youtrack/incloud/on-schedule-rules.html#sample-on-schedule-rule.

@Sergey Merzlov
Thanks , well this is an option 

Good idea is to add this flag to the rest API 

muteUpdateNotifications 

Can i add a comment to each issue im deleting from with this on schedule rule?

@Sergey Merzlov

another question that is related to the API 
i suspect you have a bug in the get issue by date range 
i have this API call :
https://track.personetics.com/youtrack/api/issues?fields=id,created,summary,date,idReadable,customFields(id,projectCustomField(field(name)))&$skip=0&$top=1000&query=has: attachments created: 2016-01-01 .. 2017-12-30

where each time i increase the $skip=0&$top=1000

fields=id,created,summary,date,idReadable,customFields(id,projectCustomField(field(name)))&$skip=0&$top=1000&query=has: attachments created: 2016-01-01 .. 2017-12-30

fields=id,created,summary,date,idReadable,customFields(id,projectCustomField(field(name)))&$skip=1000&$top=2000&query=has: attachments created: 2016-01-01 .. 2017-12-30

fields=id,created,summary,date,idReadable,customFields(id,projectCustomField(field(name)))&$skip=2000&$top=3000&query=has: attachments created: 2016-01-01 .. 2017-12-30

until there is no more issues , the problem is that I'm getting duplicate issues in the results from list of 14000 issues almost 3000 are duplicates 

Any idea why ? 

Thanks for your reply.

>Can i add a comment to each issue im deleting from with this on schedule rule?

Yes, here's the method in the issue entity in the workflow API: https://www.jetbrains.com/help/youtrack/incloud/v1-Issue.html#addComment

>Good idea is to add this flag to the rest API 

It's already supported in the resource that allows applying commands: https://www.jetbrains.com/help/youtrack/standalone/resource-api-commands.html It covers most of the cases. In other ones, a user has access to the on-schedule workflow. So adding this parameter to all API resources seems excessive, and we currently don't have plans to do it. 

>another question that is related to the API i suspect you have a bug in the get issue by date range 

There doesn't seem to be any bugs here. I've left a detailed reply in your other thread: https://youtrack-support.jetbrains.com/hc/en-us/community/posts/360009876840-Pagination-API-with-query-retunes-duplicat-issues-?page=1#community_comment_360002336020

If any questions appear, let me know. 

Sergey Merzlov 
Great so i can if i have the issue ID  i can use it in the issues Field  of the API call 
And set silent=true right ? 
How such API call should look like ?

Thanks for your reply. 

The silent part is for a command that you can apply via API. How this call should look, what fields it accepts, and so on can be found in the documentation I linked: https://www.jetbrains.com/help/youtrack/standalone/resource-api-commands.html#CommandList-supported-fields

Note that this doesn't work for your case of removing the attachments as it can't be done via a command. It was a general example in a reply to your suggestion. 

@Sergey Merzlov
i think that the notifications are sent when i add the comment to the issue not the delete operation ( not sure ) to both ...? 

Sorry, I'm afraid I'm not sure what you mean, so let me explain in the general. To do an action via an API or workflow without sending a notification, you have two options in general: 

* write an on-schedule rule and specify the muteUpdateNotifications property. After that, any changes (e.g., removing attachments, adding comments, whatever) made through this rule will be silent 

* use the command endpoint in API, which has a silent field. However, using a command, you can't remove the attachments

If that's not helpful, please elaborate on your question. Thanks. 

@Sergey Merzlov
ok I will use another api to remove it , but to add a comment i can use this, right?

The comment can be added via an API, workflow, and command — whatever you prefer.