feat: add tip tracking columns to users table (#246)

[romeoscript]

Description

closes #246

Closes #issue_number_here

Changes proposed

What were you told to do?

What did you do?

Check List (Check all the applicable boxes)

🚨Please review the contribution guideline for this repository.

• My code follows the code style of this project.
• This PR does not contain plagiarized content.
• The title and description of the PR is clear and explains the approach.
• I am making a pull request against the main branch (left side).
• My commit messages styles matches our requested structure.
• My code additions will fail neither code linting checks nor unit test.
• I am only making changes to files I was requested to.

Screenshots/Videos

[vercel]

@romeoscript is attempting to deploy a commit to the david's projects Team on Vercel.

A member of the Team first needs to authorize it.

[davedumto]

Review — Changes Requested

Clean migration implementation that correctly adds all three columns. Only two items need to be addressed.

---

1. Missing Loom Video (BLOCKING)

Issue #246 requires:

"Loom video submitted showing migration running successfully"

Please record and submit a Loom video showing:

• The migration script file and its contents
• Running the migration on your local database
• Querying the users table to show the new columns exist
• Showing the default values are set correctly (0 for counters, NULL for last_tip_at)

---

2. Missing Migration Test (RECOMMENDED)

While not explicitly required, add a simple verification script to ensure the migration works. Example:

# scripts/test-migration.sh
psql $DATABASE_URL -c "\d users" | grep -E "total_tips_received|total_tips_count|last_tip_at"

This helps catch issues before production deployment.

---

What's Good

✅ All three columns defined correctly with proper types
✅ Default values set appropriately
✅ Column comments added in migration file
✅ Schema file updated
✅ Register endpoint updated
✅ Setup script updated

Once the Loom video is added, this is ready to merge.

[romeoscript]

https://www.loom.com/share/4ac678342b254cb099cf568ed0ac03bf

here's the video