重构现代化 FastAPI 后端项目框架

resources/sql/create/4.tanks.sql

@@ -0,0 +1,18 @@
+-- [TANKS]
+
+create type tanks_overflow as enum ('YES', 'NO');
+
+create table tanks
+(
+  id varchar(32) primary key references _node(id)
+, elevation float8 not null
+, init_level float8 not null
+, min_level float8 not null
+, max_level float8 not null
+, diameter float8 not null
+, min_vol float8 not null
+, vol_curve varchar(32) references _curve(id)
+, overflow tanks_overflow
+);
+
+-- unset vol_curve when delete curve