[feat] extend database schema with new tables and indexes

database/main/weapon.sql

@@ -0,0 +1,18 @@
+create table weapon
+(
+    id                INTEGER
+        primary key,
+    item_id           INTEGER not null
+        unique
+        references item
+            on delete cascade,
+    kampftechnik_id   INTEGER not null
+        references kampftechnik
+            on delete restrict,
+    schaden_tp_formel TEXT    not null,
+    tp_kk_schwelle    INTEGER,
+    tp_kk_schritt     INTEGER,
+    at_mod            INTEGER default 0,
+    pa_mod            INTEGER default 0
+);
+