feat: free tier region limits

apps/api/src/routes/monitors.ts

@@ -42,11 +42,16 @@ export const monitors = new Elysia({ prefix: "/monitors" })
       return { error: `Minimum interval for ${plan} plan is ${limits.minIntervalS}s` };
     }
 
+    // Enforce region limit for plan
+    const regions = body.regions ?? [];
+    if (regions.length > limits.maxRegions) {
+      set.status = 400;
+      return { error: `Free plan allows ${limits.maxRegions} region per monitor. Upgrade to use multi-region.` };
+    }
+
     // SSRF protection
     const ssrfError = await validateMonitorUrl(body.url);
     if (ssrfError) { set.status = 400; return { error: ssrfError }; }
-
-    const regions = body.regions ?? [];
     const [monitor] = await sql`
       INSERT INTO monitors (account_id, name, url, method, request_headers, request_body, timeout_ms, interval_s, query, regions)
       VALUES (
@@ -89,6 +94,12 @@ export const monitors = new Elysia({ prefix: "/monitors" })
       }
     }
 
+    // Enforce region limit for plan
+    if (body.regions && body.regions.length > limits.maxRegions) {
+      set.status = 400;
+      return { error: `Free plan allows ${limits.maxRegions} region per monitor. Upgrade to use multi-region.` };
+    }
+
     // SSRF protection on URL change
     if (body.url) {
       const ssrfError = await validateMonitorUrl(body.url);

apps/api/src/utils/plans.ts

@@ -3,20 +3,24 @@ export type Plan = "free" | "pro" | "lifetime";
 export interface PlanLimits {
   maxMonitors: number;
   minIntervalS: number;
+  maxRegions: number;
 }
 
 const PLANS: Record<Plan, PlanLimits> = {
   free: {
     maxMonitors: 10,
     minIntervalS: 30,
+    maxRegions: 1,
   },
   pro: {
     maxMonitors: 200,
     minIntervalS: 2,
+    maxRegions: 99,
   },
   lifetime: {
     maxMonitors: 200,
     minIntervalS: 2,
+    maxRegions: 99,
   },
 };