fixing ThreadingInMemoryCache usage (#2604)

* ThreadingInMemoryCache usage is broken. This commit addresses those issues along with missing documentation about the caching options.

* make lint & make unit_tests fixes

* removing unnecessary changes from unclear test results in  last run

* [autofix.ci] apply automated fixes

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

.vscode/launch.json

@@ -1,6 +1,7 @@
 {
   "version": "0.2.0",
   "configurations": [
+
     {
       "name": "Debug Backend",
       "type": "debugpy",
@@ -38,6 +39,7 @@
         "--env-file",
         "${workspaceFolder}/.env"
       ],
+      // "python": "/path/to/your/python_env/python", // Replace with the path to your Python executable
       "jinja": true,
       "justMyCode": false
     },