Feat: user import action: imported dynamic data replaces pre-existing rather than merging

[jfmcquade]

PR Checklist

• PR title descriptive (can be used in release notes)
• Accidentally builds on top of refactor: store partial updates in dynamic data cache #2815, which should be merged first

Description

When restoring user profile info via the user: import template action, the user's dynamic data is now reset before the new data is imported. Previously, the imported data would be merged on top of any existing dynamic data as updates.

Additionally, the new underlying logic to reset all dynamic data is exposed in these ways:

• Via calling the reset_data template action without specifying a _list_id to reset
• On the /user debug page

Git Issues

Closes #2810, #2652

As noted in issue, we may want to offer various merge strategies and expose these to template actions. For example, click | user: import | user_id: a_user_id, merge_strategy: replace. This should be added as a follow-up issue after merging.

Screenshots/Videos

user: import flow demo:
Making change on feat_data_actions -> Sync data to server -> make additional changes on feat_data_actions -> import synced data via /user debug page -> return to feat_data_actions to see how imported changes have replaced intermediate updates. This is contrasted with the behaviour on master, where the imported updates are merged on top of intermediate updates (when executing the precise user journey shown here on master, the final state of the data list is ✅, ❌, ❌)

User.import.flow.mov

New reset buttons at bottom of /user debug page:

Updated feat_data_actions template:

[esmeetewinkel]

@jfmcquade Does this also close #2652?

[github-actions]

Visit the preview URL for this PR (updated for commit 9202f87):

https://plh-teens-app1--pr2824-feat-user-import-dya-92h3ciaj.web.app

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[esmeetewinkel]

I can't consistently get this to work (in video below I get no data, but I also think I've seen merged data...). I'm testing from the PR preview branch in a regular and private browser window.

Screenity.video.-.Mar.6.2025.mp4