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

database/main/culture_script.sql

@@ -0,0 +1,14 @@
+create table culture_script
+(
+    culture_id INTEGER not null
+        references culture
+            on delete cascade,
+    script_id  INTEGER not null
+        references script
+            on delete restrict,
+    primary key (culture_id, script_id)
+);
+
+create index idx_culture_script_script
+    on culture_script (script_id);
+