New rate model added

app/models/subcontractor_rate_model.py

@@ -0,0 +1,23 @@
+from app import db
+from datetime import datetime
+
+class SubcontractorRate(db.Model):
+    __tablename__ = "subcontractor_rates"
+
+    id = db.Column(db.Integer, primary_key=True)
+    subcontractor_id = db.Column(db.Integer, db.ForeignKey("subcontractors.id"), nullable=False)
+    subcontractor = db.relationship("Subcontractor", backref="rate_master")
+
+    category = db.Column(db.String(50), nullable=False)
+    item_code = db.Column(db.String(50), nullable=False)
+    item_name = db.Column(db.String(200), nullable=False)
+    unit = db.Column(db.String(20))
+    rate = db.Column(db.Numeric(12,2), nullable=False)
+    effective_from = db.Column(db.Date, nullable=False)
+    effective_to = db.Column(db.Date)
+    status = db.Column(db.String(20), default="Active")
+    created_at = db.Column(db.DateTime, default=datetime.now)
+
+    def __repr__(self):
+        return f"<subcontractor Rate {self.item_name}>"
+