Final Review and Next Steps

Run through the whole app

With your seeded data in place, walk through every feature one more time:

• Home — search for a name, phone fragment, or company; page through
  results if you have enough contacts; click into a few
• Detail page — star and unstar a contact; confirm phone/email links work
• New / Edit — create a contact with two groups checked; edit an
  existing one to add a third
• Delete — confirm the dialog appears, and cancel it at least once
  before actually deleting something
• Favorites — confirm it only shows starred contacts, and that search
  still works within it
• Groups — open a group’s page, confirm its contact count and list match
• Settings — export a CSV, then import it back in

If anything doesn’t behave as expected, the checkpoint at the end of the
relevant lesson describes exactly what should be true — that’s the fastest
way to find where things diverged.

What you built

Look back at the file tree now versus the empty shells you started with in
Module 1:

• lib/db.ts — a single, reused connection pool
• lib/contacts.ts and lib/groups.ts — every read and write, in plain SQL
• lib/actions.ts — every Server Action, the single bridge between your
  forms and your data
• components/ — a handful of small, mostly server-rendered pieces, and
  exactly one Client Component (DeleteContactButton), because that was
  the only place one was actually needed
• Nine working routes under app/, each reading live data with
  export const dynamic = "force-dynamic"

Nothing here reaches for a client-side data library, a REST API layer, or
an ORM. That’s not a limitation of this project — it’s a demonstration
that for an app like this, Server Components and Server Actions are
usually enough on their own.

Where you could take it next

None of these are built in this course — they’re deliberately left as
your next step, using the same patterns you just practiced:

• Authentication — scope contacts to a logged-in user (user_id on
  the contacts table, a login flow)
• Contact photos — an image field, plus a place to store the file
• Bulk actions — checkboxes on the Home page list, a Server Action
  that deletes or re-groups several contacts at once
• A smarter CSV import — detect and merge duplicates by email instead
  of always inserting a new row
• Birthdays — a date field, plus a “coming up this month” section on
  the Home page

Each of those is a reasonable-sized project on its own, using the exact
same building blocks — a data function, a Server Action, and a page — you
now have real practice with.

Checkpoint

Every feature in the app works end to end, using data you seeded yourself,
and you can describe — without looking anything up — why exactly one
component in this project needed "use client".