Resolve "Fixing Problem with duplicate Entry in Statistics"

Related to #540

src/main/java/at/ac/uibk/gitsearch/config/SecurityConfiguration.java

@@ -185,6 +185,8 @@ public class SecurityConfiguration extends WebSecurityConfigurerAdapter {
         .and()
             .authorizeHttpRequests()
 			.antMatchers("/api/validateMetaData").permitAll()
+            .antMatchers("/api/statistics/orphans").hasAuthority(AuthoritiesConstants.ADMIN)
+            .antMatchers("/api/statistics/duplicates").hasAuthority(AuthoritiesConstants.ADMIN)
             .antMatchers("/api/statistics/**").permitAll()
             .antMatchers("/oauth2/**").permitAll()
             .antMatchers("/api/search/saved-searches").authenticated()
@@ -197,6 +199,7 @@ public class SecurityConfiguration extends WebSecurityConfigurerAdapter {
             .antMatchers("/api/exerciseChildren/**").permitAll()
             .antMatchers("/api/exercise/**").permitAll()
             .antMatchers("/api/exercises/source-authorization/**").permitAll()
+            .antMatchers("/api/exercises/firstViewInSession/**").permitAll()
             .antMatchers("/api/exerciseFile/**").permitAll()
             .antMatchers("/api/refreshToken").permitAll()
             .antMatchers("/api/register").denyAll()