I setup the Database and LinqToSql classes for my app. The table structure is MeterTypes > MeterCollections > MeterUsages. Where a MeterType is the top level (ie. Electricity, Gas, Waste, etc.) the MeterCollections are the next level down (a MeterType may contain many of these, for Electricity I have Peak and Off-Peak) and MeterUsage is the actual usage on a meter for that MeterCollection.
