Update manual.md

manual.md

@@ -21,7 +21,7 @@ This manual will cover the following topics:
 The prerequisites to follow this manual are:
 * to have PostgreSQL database server installed and configured (or an alternative relational database server)
 
-## Structure of the database
+## For developer only] Structure of the database - Relations between tables
 
 The database initialization file can be found in the following file dist/db-scripts/registry2_drop-and-create-and-init.sql.orig
 
@@ -86,12 +86,17 @@ The table reg_itemhistory_reg_group_reg_role_mapping stores the relations betwee
 ![Schema image](images/reg_itemhistory_localization_relation.png)
 
 
-For the Entity Relationship Diaglam see [the bellow image](images/database_structure.png)
+And as last still a
+### Cluster with single table:
+#### reg_action table
+Reg_action table contains all the changes related to an action of submitting, rejecting, accepting or publishing. An action is related to one or more items from the table reg_item. 
+![Schema image](images/reg_action.png)
+
 
+For the Entity Relationship Diaglam see [the bellow image](images/database_structure.png)
 
 
 
-And for more details on how the tables are connected please refer to the ## [For developer only] Relations between tables
 
 ## [For admin only] How is initialize database - Distribution package