Blue-Green Deployment

{
  "nodes": [
    { "id":"u",  "type":"ellipse","label":"Users","x":40,"y":160,"fill":"#dcfce7" },
    { "id":"r",  "type":"diamond","label":"Router","x":220,"y":145,"fill":"#fef3c7" },
    { "id":"b1", "type":"rect","label":"Blue — v1.4 (live)","x":420,"y":60,"fill":"#dbeafe" },
    { "id":"g1", "type":"rect","label":"Green — v1.5 (staged)","x":420,"y":260,"fill":"#dcfce7" },
    { "id":"db", "type":"rect","label":"Shared DB","x":680,"y":160,"fill":"#ede9fe" },
    { "id":"n",  "type":"note","label":"Cutover = flip router. Rollback = flip back.","x":40,"y":320,"fill":"#fef9c3" }
  ],
  "edges": [
    { "id":"e1","source":"u","target":"r" },
    { "id":"e2","source":"r","target":"b1","label":"100%" },
    { "id":"e3","source":"r","target":"g1","label":"0%","style":"dashed" },
    { "id":"e4","source":"b1","target":"db" },
    { "id":"e5","source":"g1","target":"db" }
  ]
}