重构现代化 FastAPI 后端项目框架

resources/sql/create/20.mixing.sql

@@ -0,0 +1,12 @@
+-- [MIXING]
+
+create type mixing_model as enum ('MIXED', '2COMP', 'FIFO', 'LIFO');
+
+create table mixing
+(
+  tank  varchar(32) primary key references tanks(id)
+, model mixing_model not null
+, value float8
+);
+
+-- delete when delete tank