[EdgeDB] Create Producible, Film, EthnoArt, and Story schemas (#2970)

Author: bryanjnelson

dbschema/migrations/00028.edgeql

@@ -0,0 +1,14 @@
+CREATE MIGRATION m1rob2znvgmu7myqon4wzkdxur6765udhhucohw6apoxhtrbbnxova
+    ONTO m1aqhugpxmkst3yhkmyd5avjuqvbxk7ekgroiipkkhz3ockszv2rka
+{
+  CREATE ABSTRACT TYPE default::Producible EXTENDING default::Resource, Mixin::Named {
+      ALTER PROPERTY name {
+          SET OWNED;
+          CREATE DELEGATED CONSTRAINT std::exclusive;
+      };
+      CREATE PROPERTY scriptureReferences: multirange<std::int32>;
+  };
+  CREATE TYPE default::EthnoArt EXTENDING default::Producible;
+  CREATE TYPE default::Film EXTENDING default::Producible;
+  CREATE TYPE default::Story EXTENDING default::Producible;
+};

dbschema/producible.esdl

@@ -0,0 +1,13 @@
+module default {
+  abstract type Producible extending Resource, Mixin::Named {
+    overloaded name {
+      delegated constraint exclusive;
+    };
+    
+    scriptureReferences: multirange<int32>;
+  }
+  
+  type EthnoArt extending Producible;
+  type Film extending Producible;
+  type Story extending Producible;
+}