remove MetaDataTable and MetaDataColumn to cleanup schema

kontor-scripts/db/models/comic.py

@@ -243,6 +243,20 @@ class Issue(Base, BaseMixin):
         self.volume_id = import_data['volume_id']
         self.story_arc_id = import_data['story_arc_id']
 
+    def export_dict(self) -> Dict[AnyStr, Any]:
+        item: Dict[AnyStr, Any] = {}
+        item['id'] = self.id
+        item['created_date'] = str(self.created_date)
+        item['last_modified_date'] = str(self.last_modified_date)
+        item['version'] = self.version
+        item['issue_number'] = self.issue_number
+        item['in_stock'] = self.in_stock
+        item['is_read'] = self.is_read
+        item['comic_id'] = self.comic_id
+        item['volume_id'] = self.volume_id
+        item['story_arc_id'] = self.story_arc_id
+        return item
+
 
 class Artist(Base, BaseMixin):
     __tablename__ = "artist"
@@ -280,6 +294,16 @@ class Artist(Base, BaseMixin):
         if 'weblink' in import_data:
             self.weblink = import_data['weblink']
 
+    def export_dict(self) -> Dict[AnyStr, Any]:
+        item: Dict[AnyStr, Any] = {}
+        item['id'] = self.id
+        item['created_date'] = str(self.created_date)
+        item['last_modified_date'] = str(self.last_modified_date)
+        item['version'] = self.version
+        item['name'] = self.name
+        item['weblink'] = self.weblink
+        return item
+
 
 class WorkType(Base, BaseMixin):
     __tablename__ = "worktype"