- Added the "Artemis" and "DSpace@NTUA" digital repository URLs of the diploma thesis to README.md

- Made some corrections/enhancements (e.g. corrected the "utf8mb4_0900_ci_ai" database collation to "utf8mb4_0900_ai_ci") to the instructions in settings.py and README.md

README.md

 ## PROJECT OVERVIEW
 * Type: Diploma thesis
-* Subject: Development of the SoftLab UserBase (SLUB) web application
+* Subject: Development of the SoftLab UserBase (SLUB) web application [http://artemis.cslab.ece.ntua.gr:8080/jspui/handle/123456789/17403 and https://dspace.lib.ntua.gr/xmlui/handle/123456789/50498]
 * Author: Georgios Kazelidis \<giorgkazelidis@gmail.com>
 * Supervisor: Nikolaos Papaspyrou \<nickie@softlab.ntua.gr>
 * Copyright: © 2019 Georgios A. Kazelidis for SoftLab
@@ -111,7 +111,7 @@
 &nbsp; &nbsp; &nbsp; (11) if the project database (usermergeDB) has already been created (`SHOW DATABASES;` to check), delete it:
 
     DROP DATABASE usermergeDB;
-&nbsp; &nbsp; &nbsp; (12) create the project database (no tables are created during this substep) with "utf8mb4" as the character set and X as the collation, where X is "utf8mb4_0900_ci_ai" for MySQL (server version) 8.0, "utf8mb4_unicode_520_ci" for MySQL 5.6/5.7 or "utf8mb4_unicode_ci" for MySQL 5.5:
+&nbsp; &nbsp; &nbsp; (12) create the project database (no tables are created during this substep) with "utf8mb4" as the character set and X as the collation, where X is "utf8mb4_0900_ai_ci" for MySQL (server version) 8.0, "utf8mb4_unicode_520_ci" for MySQL 5.6/5.7 or "utf8mb4_unicode_ci" for MySQL 5.5:
 
     CREATE DATABASE usermergeDB CHARACTER SET utf8mb4 COLLATE X;
 &nbsp; &nbsp; &nbsp; (13) exit MySQL console:
@@ -275,7 +275,7 @@ with the following content (make sure to replace SERVER_IP, PROCESSES_NUMBER, TH
 ## LIST OF SUGGESTED TO-DO ACTIONS
 * Define a cron job that uses MySQL's `mysqldump` administrative command to regularly create project database backups (dump files) needed for recovery in case of system crashes, hardware failures, accidental data deletion, etc. [https://www.ostechnix.com/a-beginners-guide-to-cron-jobs/, https://dev.mysql.com/doc/refman/5.7/en/backup-and-recovery.html]
 * Define a cron job that uses Django's `clearsessions` administrative command to regularly clean expired sessions out of the django_session table and prevent it from growing excessively in the project database [https://www.ostechnix.com/a-beginners-guide-to-cron-jobs/, https://docs.djangoproject.com/en/2.0/topics/http/sessions/#clearing-the-session-store]
-* Create and use a criteria-based (e.g. last_login-based) batch deletion view for User/Registry instances to ensure that the usermerge_user and usermerge_registry tables do not grow excessively in the project database - see models.py
+* Create and use an Admin-targeted view that performs bulk deletion of User/Registry instances based on specific criteria (e.g. last_login) to ensure that the usermerge_user and usermerge_registry tables do not grow excessively in the project database - see models.py
 * Create and run unit tests [https://docs.djangoproject.com/en/2.0/topics/testing/]
 * Make better use of the Django admin site capabilities
 * Make better use of Django's model validation capabilities [https://docs.djangoproject.com/en/2.0/ref/models/instances/]

slub/slub/settings.py

@@ -246,7 +246,7 @@ DATABASES = {
         'PORT': '',
         'OPTIONS': {
            # The charset option is set to utf8mb4 and the collation_connection variable in the init_command option is set to
-           # utf8mb4_0900_ci_ai for MySQL 8.0, utf8mb4_unicode_520_ci for MySQL 5.6/5.7 or utf8mb4_unicode_ci for MySQL 5.5
+           # utf8mb4_0900_ai_ci for MySQL 8.0, utf8mb4_unicode_520_ci for MySQL 5.6/5.7 or utf8mb4_unicode_ci for MySQL 5.5
            # in order to better support the representation and sorting/comparison of Unicode data in the database.
            # For more information, see
            # https://stackoverflow.com/questions/43644218/why-is-table-charset-set-to-utf8mb4-and-collation-to-utf8mb4-unicode-520-ci?rq=1 ,