Closes #2634: Add TaskanaEngine.clearSessionCache to clear cache of underlying SQL session

Author: CRoberto1926

lib/taskana-core/src/main/java/pro/taskana/common/api/TaskanaEngine.java

@@ -226,6 +226,9 @@ default void runAsAdmin(Runnable runnable) {
    */
   CurrentUserContext getCurrentUserContext();
 
+  /** Clears the cache of the underlying local SQL session. */
+  void clearSqlSessionCache();
+
   /**
    * Connection management mode. Controls the connection handling of taskana
    *

lib/taskana-core/src/main/java/pro/taskana/common/internal/TaskanaEngineImpl.java

@@ -371,6 +371,11 @@ public CurrentUserContext getCurrentUserContext() {
     return currentUserContext;
   }
 
+  @Override
+  public void clearSqlSessionCache() {
+    sessionManager.clearCache();
+  }
+
   /**
    * This method creates the sqlSessionManager of myBatis. It integrates all the SQL mappers and
    * sets the databaseId attribute.