重构现代化 FastAPI 后端项目框架

resources/sql/create/5.pipes.sql

@@ -0,0 +1,19 @@
+-- [PIPES]
+
+create type pipes_status as enum ('OPEN', 'CLOSED', 'CV');
+
+create table pipes
+(
+  id varchar(32) primary key references _link(id)
+, node1 varchar(32) references _node(id) not null
+, node2 varchar(32) references _node(id) not null
+, length float8 not null
+, diameter float8 not null
+, roughness float8 not null
+, minor_loss float8 not null
+, status pipes_status not null
+, check (node1 <> node2)
+);
+
+-- delete when delete node1
+-- delete when delete node2