# Pull Request Template
## Description
Locks the agent quota check to the account row while creating account
users. This fixes a race where concurrent agent-create requests could
all observe the same remaining seat before any `account_users` row was
inserted.
The API continues to return the existing `402 Account limit exceeded.
Please purchase more licenses` response when the limit is reached. Bulk
create now preflights the requested email count while holding the
account lock, then creates each agent through the same locked builder
path. The Enterprise custom-role hook now no-ops when create did not
produce an agent.
Fixes:
[CW-7039](https://linear.app/chatwoot/issue/CW-7039/race-condition-in-agent-creation-bypasses-plan-agent-seat-limit)
## Type of change
- [x] Bug fix (non-breaking change which fixes an issue)
## How Has This Been Tested?
- `POSTGRES_DATABASE=chatwoot_test_c20f_agent_quota REDIS_DB=9 bundle
exec rspec spec/builders/agent_builder_spec.rb
spec/enterprise/builders/agent_builder_spec.rb
spec/controllers/api/v1/accounts/agents_controller_spec.rb
spec/enterprise/controllers/api/v1/accounts/agents_controller_spec.rb
spec/enterprise/controllers/enterprise/api/v1/accounts/agents_controller_spec.rb`
- `bundle exec rubocop app/builders/agent_builder.rb
app/controllers/api/v1/accounts/agents_controller.rb
enterprise/app/controllers/enterprise/api/v1/accounts/agents_controller.rb
spec/builders/agent_builder_spec.rb
spec/enterprise/controllers/api/v1/accounts/agents_controller_spec.rb`
- `git diff --check`
- One-off threaded Rails validation with 8 concurrent `AgentBuilder`
calls against an account with one remaining seat: `created: 1`,
`limited: 7`, final `count=2`, `limit=2`.
## 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
- [ ] Any dependent changes have been merged and published in downstream
modules
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
