Orders system overview
How the orders system fits together — context, landscape, one module, one flow.
Context
SECTION 01 · C4 model
The orders system in its world
C4 · CONTEXT
LegendPERSONpersonSYSTEMsoftware systemEXTexternal systemoutside the boundaryusesthe system in scope
Landscape
SECTION 02 · Architecture
Services and backbone
ARCH
LegendCLIENTclientSVCserviceQUEUEqueueDBdatabasecalls
One module — the API internals
SECTION 03 · Frontend logic
Orders API — the request chain
LOGIC
1calls2saves3charges4SQL5HTTPS
LegendCONTROLLERcontroller / routeSERVICEservice / use caseREPOSITORYrepositoryGATEWAYgatewayDBdatabaseEXTexternalcontract / externalpassive (state, middleware, store)usesnetwork callentry point
One flow
SEQUENCE
Legendcallresponsethe answer the caller getsactive