05/31 Phase 1: initial codes

app/models/transaction.py

@@ -0,0 +1,37 @@
+from app.extensions import db
+from datetime import datetime
+
+
+class Transaction(db.Model):
+    __tablename__ = 'transactions'
+
+    id = db.Column(db.Integer, primary_key=True)
+    account_id = db.Column(db.Integer, db.ForeignKey('accounts.id'), nullable=False)
+    to_account_id = db.Column(db.Integer, db.ForeignKey('accounts.id'), nullable=True)  # transfers
+    category_id = db.Column(db.Integer, db.ForeignKey('categories.id'), nullable=True)
+    recurring_rule_id = db.Column(db.Integer, db.ForeignKey('recurring_rules.id'), nullable=True)
+    receipt_id = db.Column(db.Integer, db.ForeignKey('receipts.id'), nullable=True)
+
+    transaction_type = db.Column(
+        db.Enum('income', 'expense', 'transfer'),
+        nullable=False
+    )
+    amount = db.Column(db.Numeric(15, 2), nullable=False)
+    description = db.Column(db.String(255), nullable=False)
+    notes = db.Column(db.Text, nullable=True)
+    date = db.Column(db.Date, nullable=False, index=True)
+    is_recurring = db.Column(db.Boolean, default=False)
+    created_at = db.Column(db.DateTime, default=datetime.utcnow)
+    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    # Relationships
+    account = db.relationship('Account', back_populates='transactions',
+                               foreign_keys=[account_id])
+    to_account = db.relationship('Account', back_populates='transfer_transactions',
+                                  foreign_keys=[to_account_id])
+    category = db.relationship('Category', back_populates='transactions')
+    receipt = db.relationship('Receipt', back_populates='transaction')
+    recurring_rule = db.relationship('RecurringRule', back_populates='transactions')
+
+    def __repr__(self):
+        return f'<Transaction {self.transaction_type} {self.amount} on {self.date}>'