improve: change db schema for settings

db/models/MarkdownSetting.py

@@ -0,0 +1,15 @@
+from sqlalchemy import Column, Integer, ForeignKey
+
+from db.models import Base
+
+
+class MarkdownSetting(Base):
+    __tablename__ = 'markdown_settings'
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    template_setting_id = Column(Integer, ForeignKey('markdown_template.id'), nullable=True)
+
+    def to_dict(self):
+        return {
+            "id": self.id,
+            "template_setting_id": self.template_setting_id,
+        }