Report internal statistics

[MichaelRoeder]

User Story

As user or maintainer of the platform, I would like to get some statistics about the data available in the database:

1. Number of experiments
2. Number of experiment tasks

Solution

Data Retrieval

The data can be easily retrieved by adding two new methods to the ExperimentDAOImpl class. Each method can run a simple SELECT COUNT(*) FROM tablename SQL query for the two tables Experiments and ExperimentTasks, expectively. (SQL Schema)

Access

The gerbil web service should provide a new method statistics returning the two counts:

{
   "experiments": 13,
   "experiment_tasks": 42,
}