## Description
First PR of user_sessions feature - enforcement, impersonation and mfa will be handled separately.
Adds an Active Sessions section under Profile where users can see every
device currently logged in and revoke any session they don't recognize.
Helps users lock down stale or unrecognized logins on their own without
needing support.
**Behavior at the limit, by client:**
- **Browser:** returns 409 with a picker overlay; user picks a session
to revoke or chooses "End all sessions" to clear them.
- **Mobile / API client:** silently evicts the oldest session and
proceeds with login (no picker UI to render).
- **Pre-tracking users** (token rows without `user_sessions`, i.e.
anyone already logged in before this ships): silent-evict any untracked
token first, so freshly tracked sessions are never killed in favor of
legacy ones.
Sessions are stored in a new `user_sessions` table keyed on `(user_id,
client_id)` with browser, platform, IP, last activity and (when
configured) geo. Kept in sync with `user.tokens` via an after_save
callback so revoking a token from any path cleans up the row.
Fixes https://linear.app/chatwoot/issue/CW-7169
## Type of change
- [x] New feature (non-breaking change which adds functionality)
## How Has This Been Tested?
- Added specs.
- Manual local testing: browser picker fires at limit; pre-tracking user
silent-evicts; mixed tracked/untracked correctly drops the untracked one
first; profile page revoke succeeds; current session cannot be revoked
from profile.
## Checklist
- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [x] Any dependent changes have been merged and published in downstream
modules
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Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>
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