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

database/main/profession_trait.sql

@@ -0,0 +1,19 @@
+create table profession_trait
+(
+    profession_id INTEGER not null
+        references profession
+            on delete cascade,
+    trait_id      INTEGER not null
+        references trait
+            on delete restrict,
+    level         INTEGER,
+    param_value   TEXT,
+    primary key (profession_id, trait_id)
+);
+
+create index idx_profession_trait_trait
+    on profession_trait (trait_id);
+
+create index idx_profession_trait_trait2
+    on profession_trait (trait_id);
+