{
	"version": 2,
	"id": "D11",
	"kind": "synthetic-chat",
	"origin": "synthetic",
	"actors": [
		"Tess",
		"Gio",
		"Nan"
	],
	"initialDocument": "",
	"steps": [
		{
			"id": "m1",
			"kind": "say",
			"actor": "Tess",
			"text": "old accounts have `full_name`; new code wants `given_name` and `family_name`.",
			"to": "room"
		},
		{
			"id": "m2",
			"kind": "say",
			"actor": "Gio",
			"text": "either a one-shot rename and backfill, or expand the schema, dual-write, backfill, then contract.",
			"to": "room"
		},
		{
			"id": "m3",
			"kind": "say",
			"actor": "Nan",
			"text": "can we do the one-shot while traffic is quiet?",
			"to": "room"
		},
		{
			"id": "m4",
			"kind": "say",
			"actor": "Gio",
			"text": "maybe, but workers can still write the old column for hours.",
			"to": "room"
		},
		{
			"id": "c4",
			"kind": "checkpoint",
			"waitFor": "settled",
			"deadlineMs": 30000
		},
		{
			"id": "m5",
			"kind": "say",
			"actor": "Tess",
			"text": "expand/contract then. I don't want a deploy-order lottery.",
			"to": "room"
		},
		{
			"id": "c5",
			"kind": "checkpoint",
			"waitFor": "settled",
			"deadlineMs": 30000
		},
		{
			"id": "m6",
			"kind": "say",
			"actor": "Nan",
			"text": "agreed, provided rollback keeps the old column until every worker moves.",
			"to": "room"
		},
		{
			"id": "c6",
			"kind": "checkpoint",
			"waitFor": "settled",
			"deadlineMs": 30000
		}
	]
}