~mna/webparts

Remove postgres-specific migrate implementation
Expose ErrNoRows from sql package
Add alias for sql.Result type
Return non-pointer Stdio
Add ArgError and Errorf to errors package
More mock implementations
More mock implementations
More mock implementations
Start implementing some mocks
Implement Account interface
Start postgres migration, does not belong in webparts
Add token service, tweaks to others
Implement the better metric interface
Update todos, description
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