5.5 build 2163
This update contains performance improvements and subdirectory support for the new frontend.

Change log
Database

• Fixed concurrency bottleneck where write and read operations interfered with each other, limiting to one query or transaction from executing at the same time. This bottleneck occurred since the access-lock designed to prevent database operations during schema modifications was still enabled after the schema modifications already completed.
• Disabled BadAFKThresholdValuePatch - This patch was written to fix bad data input from version 4.5.2 which is no longer being used according to metrics, so this patch can be disabled. It was sometimes executed if a player joined a server and never moved.

Frontend BETA
Export features are now complete, up next is Html Customization.

• Implemented support and tests for reverse-proxy setups with subdirectory proxy_pass settings (Eg. address.com/plan/)
• Implemented support and tests for Export to a subdirectory (eg. /var/public_html/plan/ accessed from address.com/plan/)

Webserver

• Added a read-write lock to json_cache so that files are not read while being written. This might solve some randomly occurring issues.

Plugin Enable

• Incorrectly written lines in unsaved-sessions.csv during plugin disable are now ignored - a warning is printed instead of an exception stacktrace.