重构现代化 FastAPI 后端项目框架

resources/sql/create/3.reservoirs.sql

@@ -0,0 +1,10 @@
+-- [RESERVOIRS]
+
+create table reservoirs
+(
+  id varchar(32) primary key references _node(id)
+, head float8 not null
+, pattern varchar(32) references _pattern(id)
+);
+
+-- unset pattern when delete pattern