Previously, the lock key for Instagram used sender_id, which for echo
messages (outgoing) would be the account's own ID. This caused all
outgoing messages to compete for the same lock, creating a bottleneck
during bulk messaging.
The fix introduces contact_instagram_id method that correctly identifies
the contact's ID regardless of message direction:
- For echo messages (outgoing): uses recipient.id (the contact)
- For incoming messages: uses sender.id (the contact)
This ensures each conversation has a unique lock, allowing parallel
processing of webhooks while maintaining race condition protection
within individual conversations.
Fixes lock acquisition errors in Sidekiq when processing bulk Instagram
messages.
Fixes
https://linear.app/chatwoot/issue/CW-5931/p0-mutexapplicationjoblockacquisitionerror-failed-to-acquire-lock-for
## Type of change
- [x] Bug fix (non-breaking change which fixes an issue)
d6af182f82