Architecture

vizzy’s own diagram, best for “what does each service send?”. Use a standalone vizzy block whose first line starts with architecture:

architecture LR My System
group data Data Layer
service web Web Frontend
service api API
service db Postgres in data
web -> api : POST /login {creds}
api -> db : SELECT user

• service <id> [Label] [in <group>] — a box (node is a synonym for service).
• group <id> [Label] — a container that following in <group> services join.
• A -> B : payload — an edge; <-> is bidirectional, --> dashed. The text after : renders as a chip on the edge.