[#890] Add daily price snapshot cron

src/app/api/cron/airdrop-price/route.ts

@@ -0,0 +1,86 @@
+/**
+ * Daily price snapshot cron (#890)
+ *
+ * Records PLOT USD price, circulating supply, and mcap for TWAP calculation.
+ * Schedule: once/day at midnight UTC (0 0 * * *)
+ */
+
+import { NextResponse } from "next/server";
+import { formatUnits } from "viem";
+import { createServerClient } from "../../../../../lib/supabase";
+import { getPlotUsdPrice } from "../../../../../lib/usd-price";
+import { publicClient } from "../../../../../lib/rpc";
+import { PLOT_TOKEN } from "../../../../../lib/contracts/constants";
+import { erc20Abi } from "../../../../../lib/price";
+
+function verifyCron(req: Request): boolean {
+  const secret = process.env.CRON_SECRET;
+  if (!secret) {
+    return process.env.NODE_ENV !== "production";
+  }
+  const authHeader = req.headers.get("authorization");
+  return authHeader === `Bearer ${secret}`;
+}
+
+export async function GET(req: Request) {
+  if (!verifyCron(req)) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+
+  const supabase = createServerClient();
+  if (!supabase) {
+    return NextResponse.json({ error: "Supabase not configured" }, { status: 500 });
+  }
+
+  const todayUtc = new Date().toISOString().slice(0, 10);
+
+  // Idempotency: skip if today already has an entry
+  const { data: existing } = await supabase
+    .from("pl_daily_prices")
+    .select("id")
+    .eq("recorded_at", todayUtc)
+    .limit(1)
+    .single();
+
+  if (existing) {
+    return NextResponse.json({ skipped: true, reason: "Entry already exists for today" });
+  }
+
+  // Fetch price — skip snapshot entirely if price fetch fails
+  const priceUsd = await getPlotUsdPrice(true);
+  if (priceUsd === null) {
+    console.error("[airdrop-price] Price fetch returned null — skipping snapshot for", todayUtc);
+    return NextResponse.json({ skipped: true, reason: "Price fetch failed" }, { status: 200 });
+  }
+
+  // Fetch circulating supply from on-chain
+  let supplyFormatted: number;
+  try {
+    const totalSupplyRaw = await publicClient.readContract({
+      address: PLOT_TOKEN,
+      abi: erc20Abi,
+      functionName: "totalSupply",
+    }) as bigint;
+    supplyFormatted = Number(formatUnits(totalSupplyRaw, 18));
+  } catch (err) {
+    console.error("[airdrop-price] Failed to fetch supply:", err);
+    return NextResponse.json({ skipped: true, reason: "Supply fetch failed" }, { status: 200 });
+  }
+
+  const mcapUsd = priceUsd * supplyFormatted;
+
+  const { error } = await supabase.from("pl_daily_prices").insert({
+    recorded_at: todayUtc,
+    price_usd: priceUsd,
+    supply: supplyFormatted,
+    mcap_usd: mcapUsd,
+  });
+
+  if (error) {
+    console.error("[airdrop-price] Insert failed:", error.message);
+    return NextResponse.json({ error: "Insert failed" }, { status: 500 });
+  }
+
+  console.info(`[airdrop-price] Snapshot recorded: date=${todayUtc} price=${priceUsd} supply=${supplyFormatted} mcap=${mcapUsd}`);
+  return NextResponse.json({ recorded: true, date: todayUtc, priceUsd, supply: supplyFormatted, mcapUsd });
+}

vercel.json

@@ -3,6 +3,10 @@
     {
       "path": "/api/cron/backfill",
       "schedule": "*/5 * * * *"
+    },
+    {
+      "path": "/api/cron/airdrop-price",
+      "schedule": "0 0 * * *"
     }
   ]
 }