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sequel based dsl to migrate data from a legacy database to a new home.

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@stmichael I think we could refine the README a bit. Adding a proper index at the top for example, because the README is quite long.

Just a suggestion, but since I needed it anyway I made a pull-request out of it: Let's give the option to enable and disable platform/database specific tests. Why? For me,...

You might want a few more unit tests, and there's a possibility this doesn't cover all execution contexts - though it meets all mine. I've added a new acceptance spec.

Now both definitions (simple and script) need the lookup tables. We need to find a better internal solution.

@internal

I started by decoupling the lookup tables from the definitions. It's not finished yet. There is still code that uses lookups on definitions. @senny what do you think about it...

We have a lot of data normalization to do in our migration. It would be very helpful to be able to extend the `ExecutionContext` of the mappings. I think we...

@idea

Hi, I'm really enjoying using this library, makes my life easier. One thing I'm not sure though, is if any "merge" mode exists, because default or :unique create new records...

As a goodie it would be extremely useful to be able to get the mapping any time after the import. Working with an imported database you often have the situation...

@feature

Our mapping file is getting big and we got some tables with a lot of mappings. The performance degraded massively when we added more and more mappings per table. I...

@internal