Updates to migration backends #750
Merged
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After several years, I've finally started working on a tool for beam migrations. I'll start a new repository for my tool, but there are some pieces missing from upstream beam that would be necessary for any migrations tool.
The key change here is adding a function to each backend to execute arbitrary SQL. This is necessary for any tool that allows running arbitrary migration scripts stored as backend-specific SQL.
The other major change is proper support for backend-agnostic transactions and proper connection handling.
All these changes are necessary for any migrations frontend, not just my tool.