fix(netflow): изолировать коллектор IPFIX и срезать раздувание базы

Co-authored-by: Cursor <[email protected]>

backend/src/services/traffic-flow-parse.test.ts

@@ -1,5 +1,5 @@
 import assert from "node:assert/strict"
-import { parseFlowPacket, protoName, resetFlowTemplatesForTests } from "./traffic-flow-parse.js"
+import { parseFlowPacket, protoName, resetFlowTemplatesForTests, templateExporterCountForTests } from "./traffic-flow-parse.js"
 import { allocateOverlayAddress, FLOW_TARGET_SRC_AUTO, usablePublicHost } from "./traffic-flow-overlay.js"
 
 function netflowV5One(): Buffer {
@@ -100,4 +100,23 @@ resetFlowTemplatesForTests()
   assert.equal(named[0]?.src, "10.1.1.8")
 }
 
+resetFlowTemplatesForTests()
+{
+  const tpl = Buffer.alloc(16 + 16 + 20)
+  tpl.writeUInt16BE(10, 0)
+  tpl.writeUInt16BE(tpl.length, 2)
+  tpl.writeUInt16BE(2, 16)
+  tpl.writeUInt16BE(16, 18)
+  tpl.writeUInt16BE(256, 20)
+  tpl.writeUInt16BE(2, 22)
+  tpl.writeUInt16BE(8, 24)
+  tpl.writeUInt16BE(4, 26)
+  tpl.writeUInt16BE(12, 28)
+  tpl.writeUInt16BE(4, 30)
+  for (let i = 0; i < 260; i++) {
+    parseFlowPacket(tpl, `203.0.${Math.floor(i / 250)}.${i % 250}`)
+  }
+  assert.ok(templateExporterCountForTests() <= 256)
+}
+
 console.log("traffic-flow-parse.test.ts: ok")