feat: create classes necessary for orm operations

app/model.py

@@ -0,0 +1,30 @@
+from pony.orm import *
+
+db = Database()
+db.bind("sqlite", "./static/wordfreqapp.db", create_db=True)  # bind sqlit file
+
+
+class User(db.Entity):
+    _table_ = "user"  # table name
+    name = PrimaryKey(str)
+    password = Optional(str)
+    start_date = Optional(str)
+    expiry_date = Optional(str)
+
+
+class Article(db.Entity):
+    _table_ = "article"  # table name
+    article_id = PrimaryKey(int, auto=True)
+    text = Optional(str)
+    source = Optional(str)
+    date = Optional(str)
+    level = Optional(str)
+    question = Optional(str)
+
+
+db.generate_mapping(create_tables=True)  # must mapping after class declaration
+
+
+if __name__ == "__main__":
+    with db_session:
+        print(Article[2].text)  # test get article which id=2 text content