Added a few comments to the new tables in idata
Added a few comments to the new tables in idata


Former-commit-id: c1f2501928079c5e31845a6c1bee70eeee3219a0 [formerly 060ed87a76f005e49056e74a589893a4d7461e9a]
Former-commit-id: f00fdbd65db3b0883473859802a7779e3d2650e5
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine