05/22 Enhance codes and fix bugs 3

app/models.py

@@ -598,4 +598,40 @@ class TicketSatisfaction(db.Model):
         return self.rating is not None
 
     def __repr__(self):
-        return f'<TicketSatisfaction ticket={self.ticket_id} rating={self.rating}>'
+        return f'<TicketSatisfaction ticket={self.ticket_id} rating={self.rating}>'
+
+
+class TicketWatcher(db.Model):
+    """Users who subscribe to updates on a ticket they didn't create."""
+    __tablename__ = 'ticket_watchers'
+
+    id         = db.Column(db.Integer, primary_key=True)
+    ticket_id  = db.Column(db.Integer, db.ForeignKey('tickets.id', ondelete='CASCADE'), nullable=False, index=True)
+    user_id    = db.Column(db.Integer, db.ForeignKey('users.id',   ondelete='CASCADE'), nullable=False)
+    created_at = db.Column(db.DateTime, default=datetime.utcnow)
+
+    __table_args__ = (db.UniqueConstraint('ticket_id', 'user_id', name='uq_watcher_ticket_user'),)
+
+    ticket = db.relationship('Ticket', backref=db.backref('watchers', lazy='dynamic', cascade='all, delete-orphan'))
+    user   = db.relationship('User',   backref=db.backref('watching', lazy='dynamic'))
+
+    def __repr__(self):
+        return f'<TicketWatcher ticket={self.ticket_id} user={self.user_id}>'
+
+
+class TimeEntry(db.Model):
+    """IT staff time log for a ticket."""
+    __tablename__ = 'time_entries'
+
+    id          = db.Column(db.Integer, primary_key=True)
+    ticket_id   = db.Column(db.Integer, db.ForeignKey('tickets.id', ondelete='CASCADE'), nullable=False, index=True)
+    user_id     = db.Column(db.Integer, db.ForeignKey('users.id',   ondelete='CASCADE'), nullable=False)
+    minutes     = db.Column(db.Integer, nullable=False)
+    note        = db.Column(db.String(200))
+    logged_at   = db.Column(db.DateTime, default=datetime.utcnow)
+
+    ticket = db.relationship('Ticket', backref=db.backref('time_entries', lazy='dynamic', cascade='all, delete-orphan'))
+    user   = db.relationship('User',   backref=db.backref('time_entries', lazy='dynamic'))
+
+    def __repr__(self):
+        return f'<TimeEntry ticket={self.ticket_id} minutes={self.minutes}>'