create regular exp added and change model

app/routes/dashboard.py

@@ -1,7 +1,7 @@
 import matplotlib
 matplotlib.use("Agg")
 
-from flask import Blueprint, render_template, session, redirect, url_for, jsonify
+from flask import Blueprint, render_template, session, redirect, url_for, jsonify, request
 import matplotlib.pyplot as plt
 import io
 import base64
@@ -93,6 +93,9 @@ def subcontractor_chart():
     if subcontractor_id:
         query = query.filter(TrenchExcavation.subcontractor_id == subcontractor_id)
 
+    if category:
+        query = query.filter(TrenchExcavation.subcontractor_id == subcontractor_id)
+
     if ra_bill:
         query = query.filter(TrenchExcavation.RA_Bill_No == ra_bill)