[#890] Add daily price snapshot cron

[realproject7]

Fixes #890

Summary

• POST /api/cron/airdrop-price: daily cron that records PLOT USD price, circulating supply, and mcap into pl_daily_prices
• Uses existing getPlotUsdPrice() for price and on-chain totalSupply via viem for supply
• Idempotent: checks for existing entry before insert (one per day)
• Skips snapshot if price or supply fetch fails (no zero/stale values) — logs failure
• Auth via CRON_SECRET Bearer token (matches existing cron pattern)
• Registered in vercel.json at 0 0 * * * (midnight UTC)

Test plan

• Verify cron rejects unauthorized requests (401)
• Verify idempotency — second call same day returns skipped
• Verify price null → skip with log, no DB insert
• Verify supply fetch failure → skip with log, no DB insert
• Verify successful insert with correct price, supply, mcap values
• Verify vercel.json cron schedule is correct

🤖 Generated with Claude Code

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
plotlink	Ignored		Apr 21, 2026 6:03am

[project7-interns]

Verdict: REQUEST CHANGES

Summary

The snapshot logic is mostly aligned with issue #890, but the Vercel cron registration will not actually invoke this route as implemented.

Findings

• [high] The route only exports POST, but vercel.json cron jobs call the configured path with GET. That means the scheduled job at /api/cron/airdrop-price will hit a method mismatch instead of recording a daily snapshot.
  • File: src/app/api/cron/airdrop-price/route.ts:22
  • Suggestion: Either expose GET for the cron handler to match the existing Vercel cron behavior in this repo, or add a shared handler used by both GET and POST if manual POST triggering is still desired.

Decision

Requesting changes because the daily snapshot cron will not run successfully in production with the current method/export setup.

[project7-interns]

Verdict: APPROVE

Summary

The follow-up update resolves the cron invocation issue from my prior review. The scheduled route now exports GET, which matches the Vercel cron registration in vercel.json.

Findings

• No remaining code-level blockers in the changed files.

Decision

Approving because the daily price snapshot cron I reviewed now matches issue #890 and the registered Vercel cron behavior.