Eca monitoring page is [mostly] ready

When I say the runs are automatically expired after a week, I mean that the runs are stored as hashes under the keys "eca-run-%i" % run. When you add these in add_runs_to_db() the keys are set to expire after 604800 seconds. So after a week, the hash will no longer exist, but the sorted set lookup you have (RUN_INDEX) will still contain an index to that key.