Backend Notifications: 1 - migrations

[danctila]

Description

Adds the two Postgres migrations needed to support the upcoming notification system.

Type of Change

• New feature (non-breaking change that adds functionality)

Related Issue(s)

Working towards #97

What Changed?

• Added public.notifications table to store in-app notifications per user, with a (user_id, created_at desc) index
• Added public.device_tokens table to store Expo push tokens for mobile, with a unique(user_id, token) constraint

Unfinished Work & Known Issues

• The following items are intentionally deferred:
  • Application code (repository, service, handler, routes)
  • Web notifications
  • Mobile expo-notifications registration

Pre-Merge Checklist

Code Quality

• Code follows the project's style guidelines and conventions
• Self-review completed (I've reviewed my own code for obvious issues)
• No debugging code, console logs, or commented-out code left behind
• No merge conflicts with the base branch
• Meaningful commit messages that explain the "why"

Testing & CI

• All CI checks are passing
• Linting passes without errors

Documentation

• Code is self-documenting or includes helpful comments for complex logic

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 18.24%. Comparing base (e89757c) to head (352a93e).
⚠️ Report is 2 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (e89757c) and HEAD (352a93e). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (e89757c)	HEAD (352a93e)
mobile	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #265       +/-   ##
===========================================
- Coverage   84.00%   18.24%   -65.76%     
===========================================
  Files           7       42       +35     
  Lines          50     1716     +1666     
  Branches       24        0       -24     
===========================================
+ Hits           42      313      +271     
- Misses          8     1397     +1389     
- Partials        0        6        +6     

Flag	Coverage Δ
backend	18.24% <ø> (?)
mobile	?

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see 49 files with indirect coverage changes

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