Fixes https://linear.app/chatwoot/issue/CW-7559/inbox-limit-abuse
## Why
The regular inbox API checked limits in the controller, but WhatsApp
embedded signup creates inboxes through a service using `Inbox.create!`.
That let Enterprise account inbox limits be skipped for embedded signup.
## What this change does
- Adds an Inbox create-time validation hook in OSS and implements the
limit check in the Enterprise Inbox module.
- Removes the duplicate controller/helper limit check so the model is
the single enforcement point.
- Preserves the existing `402 Payment Required` API response for account
inbox limit failures.
- Keeps updates to existing inboxes allowed when an account is already
at its inbox limit.
## Validation
- `bundle exec rspec
spec/controllers/api/v1/accounts/inboxes_controller_spec.rb
spec/enterprise/models/inbox_spec.rb`
# Pull Request Template
## Description
Message creation API failures caused by PostgreSQL query cancellations
now return a generic retryable error instead of exposing raw database
internals such as `PG::QueryCanceled`, tuple identifiers, or relation
names to customers. Existing validation failures continue to return
their specific validation messages.
Closes
[CW-7538](https://linear.app/chatwoot/issue/CW-7538/do-not-expose-pgquerycanceled-details-in-messages-api-errors)
## Type of change
- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality not to work as expected)
- [ ] This change requires a documentation update
## How Has This Been Tested?
Reproduced the messages API path by raising
`ActiveRecord::QueryCanceled` from `Messages::MessageBuilder` and
verified the response contains the customer-safe localized error without
`PG::QueryCanceled` details.
Validation run locally:
- `bundle exec rspec
spec/controllers/api/v1/accounts/conversations/messages_controller_spec.rb`
- `bundle exec rubocop
app/controllers/concerns/request_exception_handler.rb
spec/controllers/api/v1/accounts/conversations/messages_controller_spec.rb`
- `git diff --check`
## Checklist:
- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] 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
- Initialize an "enterprise" folder that is copyrighted.
- You can remove this folder and the system will continue functioning normally, in case you want a purely MIT licensed product.
- Enable limit on the number of user accounts in enterprise code.
- Use enterprise edition injector methods (inspired from Gitlab).
- SaaS software would run enterprise edition software always.
Co-authored-by: Pranav Raj S <pranav@chatwoot.com>
