FatTail experienced a notice incident on December 18, 2025 affecting AdBook+ System Performance and AdBook+ Order Management and 1 more component, lasting 16h 41m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Dec 18, 2025, 09:06 PM UTC
We are aware of and urgently investigating an issue with AdBook system performance. Users may experience latency when accessing or navigating within the system. Further updates will be provided here as soon as they are available. Please contact us at support.fattail.com with questions.
- monitoring Dec 18, 2025, 09:17 PM UTC
Performance has been restored and users should no longer experience latency in the system. We are continuing to monitor system health and will publish more information once full details on cause are available.
- resolved Dec 19, 2025, 01:48 PM UTC
This incident has been resolved.
- postmortem Feb 05, 2026, 08:35 PM UTC
### **Summary of Impact** On Thursday December 18th, at approximately 3.45pm ET, some users of the [adbook03.fattail.com](http://adbook03.fattail.com) site experienced timeouts and error messages. Our monitoring systems immediately alerted the engineering teams who identified the cause and restored normal service by approximately 4.15pm ET. ### **Root Cause** The issue was caused by an inefficient reporting query that led to increased system load and affected application responsiveness. ### **Resolution** The engineering team updated the affected query, eliminating the performance bottleneck and restoring normal platform behavior. ### **Next Steps** To help prevent similar issues in the future, we are: * Continuing to monitor system performance for similar patterns Reviewing and optimizing reporting queries to reduce the risk of blocking or delays