[feat] extend database schema with new tables and indexes

database/main/creature_attack_has_property.sql

@@ -0,0 +1,14 @@
+create table creature_attack_has_property
+(
+    attack_id   INTEGER not null
+        references creature_attack
+            on delete cascade,
+    property_id INTEGER not null
+        references creature_attack_property
+            on delete restrict,
+    primary key (attack_id, property_id)
+);
+
+create index idx_creature_attack_has_prop_prop
+    on creature_attack_has_property (property_id);
+