feat(backend): add the db connection

backend/main.py

@@ -0,0 +1,38 @@
+from database.repository import Repository
+from database.connection import DatabaseConnection
+
+def main():
+    db = DatabaseConnection("database.db")
+    repository = Repository(db)
+
+    # Retrieve data
+    classifications = repository.get_all_classifications()
+    members = repository.get_all_members()
+    service_types = repository.get_all_service_types()
+    services = repository.get_all_services()
+    service_availability = repository.get_all_service_availability()
+
+    print("Classifications:")
+    for classification in classifications:
+        print(classification)
+
+    print("\nMembers:")
+    for member in members:
+        print(member)
+
+    print("\nService Types:")
+    for service_type in service_types:
+        print(service_type)
+
+    print("\nServices:")
+    for service in services:
+        print(service)
+
+    print("\nService Availability:")
+    for availability in service_availability:
+        print(availability)
+
+    db.close_connection()
+
+if __name__ == "__main__":
+    main()