[add]: Database connection and migrations

app/models/account.py

@@ -0,0 +1,15 @@
+from datetime import datetime
+from app import db
+
+class Account(db.Model):
+    id = db.Column(db.String(50), primary_key=True)  
+    customer_id = db.Column(db.String(50), db.ForeignKey('customer.id'), nullable=False)
+    account_type = db.Column(db.String(50))
+    status = db.Column(db.String(20), default='active')
+    lien_amount = db.Column(db.Float, default=0.0)
+    created_at = db.Column(db.DateTime, default=datetime.utcnow)
+    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    def __repr__(self):
+        return f'<Account {self.id}>'
+