Notification system

[yourvivian]

Notification Type	Description	Push Notification’s Message	Status
Upcoming Trip Notification	Notify the day before the trip starts (cron task daily)	"Get ready for {trip_name}! Let's review the plan for {location} together."	[x] #42
Ongoing Trip's Calendar Notification	Notify in between every activity	Save to user's local calendar and let iOS/Google Calendar handle this	[ ]
Activity Notification	Notifying users once a week about activities in their upcoming trip if there are too few activities that they have upvoted/created (if total activities in database is less than total day of trip; cron task weekly)	"Help us plan your trip {trip_name} by giving a thumbs-up to activities you like!"	[ ]
Activity Update Notification	Informs participants of updates to trip's start/end date, timing or location of initerary's events (mongodb changestream?).	"There are updates in schedules/activities/trip details for trip X" for every 6 hours	[ ]
Itinerary Notification	Weekly cron task	"Check out itinerary page to create trip itinerary" if nothing in calendar yet // "Add a few more places to go?" if too few activities on calendar (should have 1 activity/day)	[ ]
Trip Creation Notification	Notifies users when a new trip plan is created, inviting friends to join. Using MongoDB change streams to monitor changes in your database and trigger notifications to trip's host if no other participants is in there	"Don't forget to invite your friends to join you for {trip_name}.	[ ]
Invitation Notification	Sends notifications to invited friends with trip details, prompting them to accept or reject the invitation.	(phần này trang đang làm) (may integrate into noti, or simply leave on UI)	[ ]
Acceptance/Rejection Notification	Informs the trip host & trip members when a friend accepts the trip invitation.	"A new member has joined the trip" for every single existing member	[ ]