Collect user interaction data

[ChristophWurst]

For https://github.com/nextcloud/mail/projects/7 we need data about important interactions of a user.

• Requires Add user setting to opt-out from data collection #2559

As a start we should focus on the people who interacted, hence only consider the email addresses. In a step we can extend the logic to also collect subject or even the message content.

• Messages read -> save sender email
• Messages starred -> save sender email
• Messages deleted -> save sender email
• Message sent -> save all recipients (should also work for replies)

I would propose to do this in two parts

• Emit events with https://nextcloud.github.io/nextcloud-event-bus/ for the actions above -> @GretaD
• Debounce and combine events and send to back-end -> @ChristophWurst

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[republicus]

Will this also work with drafts as I reported in #2850 ?

[ChristophWurst]

I don't think drafts should be taken into consideration. Also that ticket is about a bug, not a feature.

We might not need this expensive data collection at all. #2796 does it with just the cached data.

[ChristophWurst]

For the first version of #2796 we won't need any of this as we have that data locally already.