chnages of store proce. use and code optimize

main.py

@@ -461,10 +461,11 @@ def summary_report():
 @app.route("/mat_credit", methods=["GET"])
 @auth.login_required
 def mat_credit():
-
-    mat= MatCreditHandler()
-    mat_rows, utilization_rows = mat.fetch_all()
-    mat.close()
+    mat = MatCreditHandler()
+    try:
+        mat_rows, utilization_rows = mat.fetch_all()
+    finally:
+        mat.close()
 
     utilization_map = {}
     all_years = set()
@@ -482,27 +483,30 @@ def mat_credit():
         added_years=sorted(all_years)
     )
 
-# save mat credit row data
+#  save mat credit row data
 @app.route("/save_mat_row", methods=["POST"])
 @auth.login_required
 def save_mat_row():
-    mat= MatCreditHandler()
+    mat = MatCreditHandler()
     try:
         mat.save_single(request.json)
         return jsonify({"message": "Row saved successfully"})
     except Exception as e:
         return jsonify({"error": str(e)}), 500
+    finally:
+        mat.close()
+
 
 # save mat credit bulk data
-@app.route("/save_mat_all", methods=["POST"])
-@auth.login_required
-def save_mat_all():
-    mat= MatCreditHandler()
-    try:
-        skipped = mat.save_bulk(request.json)
-        return jsonify({"message": "Saved successfully", "skipped": skipped})
-    except Exception as e:
-        return jsonify({"error": str(e)}), 500
+# @app.route("/save_mat_all", methods=["POST"])
+# @auth.login_required
+# def save_mat_all():
+#     mat= MatCreditHandler()
+#     try:
+#         skipped = mat.save_bulk(request.json)
+#         return jsonify({"message": "Saved successfully", "skipped": skipped})
+#     except Exception as e:
+#         return jsonify({"error": str(e)}), 500
 
 
 # run server