05/31 Phase 1: initial codes

app/models/net_worth_snapshot.py

@@ -0,0 +1,18 @@
+from app.extensions import db
+from datetime import datetime
+
+
+class NetWorthSnapshot(db.Model):
+    __tablename__ = 'net_worth_snapshots'
+
+    id = db.Column(db.Integer, primary_key=True)
+    snapshot_date = db.Column(db.Date, nullable=False, unique=True, index=True)
+    total_assets = db.Column(db.Numeric(15, 2), nullable=False, default=0)
+    total_liabilities = db.Column(db.Numeric(15, 2), nullable=False, default=0)
+    net_worth = db.Column(db.Numeric(15, 2), nullable=False, default=0)
+    account_balances = db.Column(db.JSON, nullable=True)   # snapshot of each account balance
+    investment_value = db.Column(db.Numeric(15, 2), default=0)
+    created_at = db.Column(db.DateTime, default=datetime.utcnow)
+
+    def __repr__(self):
+        return f'<NetWorthSnapshot {self.snapshot_date} nw={self.net_worth}>'