Wallace is a summarization tool designed for data analysis that bridges multiple databases based on a constraint.
As a motivating example of where Wallace fits in, imagine you have a database where you write event data based on interactions with a website. This is a *lot* of data.
Every so often, an ETL job sweeps through and writes that event data to an optimized data warehouse. However, the SLA on the warehouse is 24 hours, and you want summaries starting from 3 hours back.
With Wallace, you can declare this constraint, and Wallace will run the queries for the appropriate range against each data store, aggregate the results, and write the data to the specified summary table.
RubyGems - To be released