feat(backend): add the db connection

backend/database/models/member.py

@@ -0,0 +1,19 @@
+from ..connection import DatabaseConnection
+
+class Member:
+    def __init__(self, first_name: str, last_name: str, email: str, phone_number: str, classification_id: int, notes: str = None):
+        self.first_name = first_name
+        self.last_name = last_name
+        self.email = email
+        self.phone_number = phone_number
+        self.classification_id = classification_id
+        self.notes = notes
+
+    def save(self, db: DatabaseConnection):
+        query = "INSERT INTO Members (FirstName, LastName, Email, PhoneNumber, ClassificationId, Notes) VALUES (?, ?, ?, ?, ?, ?)"
+        db.execute_query(query, (self.first_name, self.last_name, self.email, self.phone_number, self.classification_id, self.notes))
+
+    @classmethod
+    def get_all(cls, db: DatabaseConnection):
+        query = "SELECT * FROM Members"
+        return db.execute_query_with_return(query)