Implementing session, occurence tables

(All tables which include created and updated)
1. created date problem: create date format has issue when update time
changes
"template" : '#=convertTime(created)#'
NaN/NaN/NaN NaN:NaN:NaN
but create time is not changed in database
http://localhost:2403/dashboard

(issues table)
2. uid can not be created in issues table

3. each cell only can be editted once

4. when creating a same issue(same title, description pid), it will
display an empty row(not write into database, old problem, see it
before)

(session table)

5. it seems that there is a build-in sessions table, so we have
'session' table instead of 'sessions'

6. uid can not be created in session table

7. each cell only can be editted once

(occurences table)

8. each cell only can be editted once

9. uid can not be created in occurences table