[feat] add initial database schema with tables, triggers, and views

database/main/exclusive_group.sql

@@ -0,0 +1,9 @@
+create table exclusive_group
+(
+    id    INTEGER
+        primary key,
+    name  TEXT not null,
+    scope TEXT not null,
+    check (scope IN ('TRAIT', 'SF', 'TALENT', 'SPELL', 'LITURGY'))
+);
+