Wave 4, second half. PUT /api/machines/<id> returned 500 and rolled the whole
edit back for any machine with a maintenance date recorded - including a rename
that never touched the date. The Machine edit form could not save such a
machine at all, which is most of them once a maintenance schedule exists.
The route builds {'old': getattr(row, field)} straight off the model, so the
changes dict carries whatever the column holds: a date, a datetime, a Decimal.
AuditLog.changes serialised it with a bare json.dumps, which raises on all
three, and nothing caught it. The audit entry and the edit share a transaction,
so the failure took the edit with it.
json.dumps now has a fallback encoder: dates and datetimes become ISO strings,
Decimals become floats, sets and bytes get something readable, and anything
else becomes its repr rather than an exception. An audit entry that reads a
little awkwardly is worth more than a failed write - the alternative, and what
happened, is losing the change AND the record of it.
Fixed at the audit log rather than in the machines route: every audited route
builds its changes dict the same way, so the next one to audit a date field
would have hit the same wall.
Four tests, including the exact shape the machines route produces. Verified by
planting the bare dumps back: two fail.
Scope: product
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