fix(api): clamp posts feed pagination, JSON errors on hot GETs, 404 on missing moderated post

[Ayush7614]

What

• GET /api/posts?feed=1 offset is now parsed with a shared clamped helper (parseFeedPaging/feedPostsKey, cap 100k, trunc, NaN/negative to 0) so ?offset=-5, 1.9, 9999999999 or abc can no longer mint distinct memo keys or force huge OFFSET scans. listFeed also clamps limit/offset defensively.
• Hot read GETs (posts token + feed, launch list/holders/candles/feed/search/live, me) now return JSON {error} with 502 on DB/RPC failure instead of an unhandled HTML 500, keeping the 5s pollers on JSON.
• POST /api/posts/mod hide/unhide on a nonexistent post now returns 404 instead of {ok:true} (UPDATE ... RETURNING id row check), matching mute/report/createPost behavior.

Why

• Unbounded feed offset produced unbounded memo keys (feed-posts:) that evict the hot feed-posts:0 entry shared with /api/launch/live, and huge OFFSET forces expensive scans.
• Polling clients expect JSON; an HTML 500 breaks them.
• A phantom {ok:true} for post:99999999 hides moderation failures.

Verified

• npx tsc --noEmit -p .: pass
• npm run lint: pass
• node --test posts-paging + paging: 9/9 pass (2 new: parseFeedPaging clamp, feedPostsKey normalization)
• full unit suite: 444 pass / 3 fail — the 3 failures are pre-existing image-upload tests that also fail on clean upstream/main (verified via stash)
• npm run build: pass

Summary by CodeRabbit

• Bug Fixes

  • API failures across launch, wallet, feed, search, comments, and holder endpoints now return consistent HTTP 502 responses instead of unhandled errors.
  • Feed pagination now safely handles invalid, negative, fractional, and excessively large offsets.
  • Feed and token listing requests apply consistent limits and offsets.
  • Attempts to hide or restore a post that does not exist now return a 404 error.

• Tests

  • Added coverage for feed pagination normalization and limits.

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📥 Commits

Reviewing files that changed from the base of the PR and between e3e1582 and c204bed.

📒 Files selected for processing (6)

• app/src/app/api/launch/candles/route.ts
• app/src/app/api/launch/list/route.ts
• app/src/app/api/launch/live/route.ts
• app/src/lib/launchpad/posts-paging.test.ts
• app/src/lib/launchpad/posts-paging.ts
• app/src/lib/launchpad/postsServer.ts

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📥 Commits

Reviewing files that changed from the base of the PR and between 8dd996b and e3e1582.

📒 Files selected for processing (8)

• app/src/app/api/launch/candles/route.ts
• app/src/app/api/launch/feed/route.ts
• app/src/app/api/launch/holders/route.ts
• app/src/app/api/launch/list/route.ts
• app/src/app/api/launch/live/route.ts
• app/src/app/api/launch/search/route.ts
• app/src/app/api/me/route.ts
• app/src/app/api/posts/route.ts

🚧 Files skipped from review as they are similar to previous changes (7)

• app/src/app/api/me/route.ts
• app/src/app/api/launch/search/route.ts
• app/src/app/api/launch/feed/route.ts
• app/src/app/api/launch/list/route.ts
• app/src/app/api/launch/live/route.ts
• app/src/app/api/launch/candles/route.ts
• app/src/app/api/posts/route.ts

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📝 Walkthrough

Walkthrough

The pull request adds error logging to launch, wallet, and posts endpoints while preserving generic 502 responses. It adds bounded feed paging helpers, clamps feed query parameters, and reports missing posts during moderation.

Changes

Launch API and posts handling

Layer / File(s)	Summary
Feed paging contracts and server bounds app/src/lib/launchpad/posts-paging.ts, app/src/lib/launchpad/postsServer.ts, app/src/lib/launchpad/posts-paging.test.ts	Feed offsets are truncated and clamped. Feed limits are bounded. Memo keys use normalized offsets. Tests cover these rules.
Posts route and moderation handling app/src/app/api/posts/route.ts, app/src/lib/launchpad/postsServer.ts	The posts route uses shared paging helpers and logs feed and token loading failures. Moderation returns 404 when the target post does not exist.
Launch and wallet route error handling app/src/app/api/launch/*/route.ts, app/src/app/api/me/route.ts	Routes log caught loading failures and preserve their existing generic 502 JSON responses and successful response behavior.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Suggested reviewers: kevincodex1

Merge Risk: ⚪ Minimal · up to e3e15

The PR bounds feed pagination, reports missing moderation targets, and preserves generic API failures with added server-side diagnostics.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 78.57% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 14 functions across 11 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the pull request's main changes: posts feed pagination clamping, JSON error handling for hot GET endpoints, and 404 responses for missing moderated posts.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@app/src/app/api/posts/route.ts`:
- Line 18: Update both GET loader catch blocks in the route to bind the caught
error and log it with the established console.error convention before returning
the existing generic 502 response; preserve the response body and status.

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📥 Commits

Reviewing files that changed from the base of the PR and between c51e0ce and 8dd996b.

📒 Files selected for processing (11)

• app/src/app/api/launch/candles/route.ts
• app/src/app/api/launch/feed/route.ts
• app/src/app/api/launch/holders/route.ts
• app/src/app/api/launch/list/route.ts
• app/src/app/api/launch/live/route.ts
• app/src/app/api/launch/search/route.ts
• app/src/app/api/me/route.ts
• app/src/app/api/posts/route.ts
• app/src/lib/launchpad/posts-paging.test.ts
• app/src/lib/launchpad/posts-paging.ts
• app/src/lib/launchpad/postsServer.ts

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