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instrumentation.ts

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+/**
+ * Next.js Instrumentation Hook
+ *
+ * https://nextjs.org/docs/app/building-your-application/optimizing/instrumentation
+ *
+ * This file is automatically loaded by Next.js when the server starts.
+ * We use it to boot the EVE auto-sync cron job in the Node.js runtime.
+ *
+ * IMPORTANT: We only run on the server (Node.js runtime), not on the
+ * Edge runtime — node-cron requires Node.js APIs.
+ */
+
+export async function register() {
+  // Only boot in the Node.js runtime — not Edge, not Workers
+  if (process.env.NEXT_RUNTIME !== "nodejs") {
+    return;
+  }
+
+  // Skip during builds (Next.js runs instrumentation during `next build` too)
+  if (process.env.NEXT_PHASE === "phase-production-build") {
+    return;
+  }
+
+  console.log("[instrumentation] Booting EVE auto-sync cron...");
+
+  // Dynamic import keeps node-cron out of the Edge bundle
+  const { startAutoSyncCron } = await import("@/lib/eve/cron");
+
+  // Default: tick every minute. Override with EVE_SYNC_CRON env var.
+  // Examples:
+  //   "* * * * *"     — every minute (default)
+  //   "*/30 * * * * *" — every 30 seconds (uses 6-field syntax)
+  //   "*/5 * * * *"   — every 5 minutes
+  const schedule = process.env.EVE_SYNC_CRON || "* * * * *";
+  startAutoSyncCron(schedule);
+}