add versioning to markup languages and reparse old format version posts

app/db.py

@@ -202,9 +202,9 @@ class Model:
 
 
     @classmethod
-    def findall(cls, condition):
+    def findall(cls, condition, operator='='):
         rows = db.QueryBuilder(cls.table)\
-            .where(condition)\
+            .where(condition, operator)\
             .all()
         res = []
         for row in rows: