Added support for painless upgrades from V6 & older runtimes. #759
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Summary
Improved structure of version migrations, and added a migration for runtime V6 EventSource IDs (which were UUIDs). This eliminates the need for the V6 compatibility mode, and this has been removed as well.
This means that upgrading from older versions of the runtime should now be painless, as the runtime migrates the existing database on startup if present.
Added
Removed