Initial commit

script/sql/create/9.demands.sql

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+-- [DEMANDS]
+
+create table demands
+(
+  _order serial primary key
+, junction varchar(32) references junctions(id) not null
+, demand float8 not null
+, pattern varchar(32) references _pattern(id)
+, category text
+);
+
+-- delete when delete junction
+-- unset pattern when delete pattern