fix(traffic): строить непрерывную историю коротких периодов

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

@@ -4,7 +4,7 @@ import {
   ingestParsedFlowsForServerForTests,
   resetFlowRingsForTests,
 } from "./traffic-flow-ingest.js"
-import { buildFlowAnalytics, formatLiveSseFromBuilder, getFlowMonthly, listFlowClients, listFlowExporters } from "./traffic-flow-analytics.js"
+import { buildFlowAnalytics, formatLiveSseFromBuilder, getFlowMonthly, listFlowClients, listFlowExporters, resetFlowAnalyticsCacheForTests } from "./traffic-flow-analytics.js"
 import { withPgOrSkip } from "../test/pg.js"
 import { dbQuery } from "../db/index.js"
 import { seedFlowTopologyForTests, type FlowTopology } from "./traffic-flow-topology.js"
@@ -556,6 +556,22 @@ try {
   }
 }
 
+// Historical 5m/15m charts survive an empty live ring (e.g. immediately after restart).
+resetFlowRingsForTests()
+await dbQuery("DELETE FROM flow_buckets WHERE server_id=$1", [serverId])
+for (const minutesAgo of [2, 3, 4, 10]) {
+  await dbQuery(`INSERT INTO flow_buckets (server_id,bucket_at,src,dst,in_iface,bytes,packets)
+    VALUES ($1,date_trunc('minute',now())-($2::int*interval '1 minute'),'10.1.1.8','8.8.8.8','2',60000,10)`, [serverId, minutesAgo])
+}
+for (const minutes of [5, 15]) for (const dedup of [true, false]) {
+  resetFlowAnalyticsCacheForTests()
+  const history = await buildFlowAnalytics({ minutes, serverId, dedup, excludeMesh:false, excludeOverlay:false })
+  assert.equal(history.rxSeries.length, minutes)
+  assert.equal(history.rxSeries.filter(v => v > 0).length, minutes === 5 ? 3 : 4)
+  const missing = await buildFlowAnalytics({ minutes, serverId, iface:"not-an-interface" })
+  assert(missing.rxSeries.every(v => v === 0), "Historical chart respects interface filter")
+}
+
 } finally {
   for (const table of ["flow_daily_dims", "flow_hour_facts", "flow_daily_facts", "flow_buckets", "traffic_samples", "user_interface_bindings", "server_snapshots"]) {
     await dbQuery("DELETE FROM " + table + " WHERE server_id = $1", [serverId])