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

database/main/requirement.sql

@@ -0,0 +1,31 @@
+create table requirement
+(
+    id          INTEGER
+        primary key,
+    owner_kind  TEXT              not null,
+    owner_id    INTEGER           not null,
+    group_no    INTEGER default 1 not null,
+    negate      INTEGER default 0 not null,
+    req_type    TEXT              not null,
+    req_id      INTEGER,
+    req_level   INTEGER,
+    req_optokey TEXT,
+    note        TEXT,
+    check (negate IN (0, 1)),
+    check (owner_kind IN (
+                          'TRAIT', 'SF', 'TALENT', 'SPELL', 'LITURGY', 'PROFESSION', 'SPECIES', 'CULTURE'
+        )),
+    check (req_type IN (
+                        'TRAIT', 'TRAIT_LEVEL_MIN',
+                        'ATTR_MIN', 'TALENT_MIN', 'SF',
+                        'SPECIES', 'CULTURE', 'TRADITION', 'MERKMAL',
+                        'EXCLUSIVE_GROUP'
+        ))
+);
+
+create index idx_requirement_owner
+    on requirement (owner_kind, owner_id, group_no);
+
+create index idx_requirement_ref
+    on requirement (req_type, req_id);
+