fix(backend): уменьшить лишние записи SQLite

Убрать WAL TRUNCATE с hot path NetFlow, не писать неизменённые UPDATE
и служебные INSERT, кэшировать карты topology/analytics.

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

backend/package.json

@@ -14,7 +14,7 @@
     "test:auth": "tsx src/lib/permissions.test.ts && tsx src/plugins/auth.smoke.test.ts",
     "test:wireguard": "npx tsx src/services/wireguard-config.test.ts",
     "test:traffic-rate": "tsx src/services/traffic-rate.test.ts",
-    "test:traffic-flow": "tsx src/services/traffic-flow-parse.test.ts && tsx src/services/traffic-flow-map-exporter.test.ts && tsx src/services/traffic-flow-ifaces.test.ts && tsx src/services/traffic-flow-dedup.test.ts && tsx src/services/traffic-flow-planes.test.ts && tsx src/services/traffic-flow-ip.test.ts && tsx src/services/traffic-flow-classify.test.ts && tsx src/services/traffic-flow-ripe.test.ts && tsx src/services/traffic-flow-brands.test.ts && tsx src/services/traffic-flow-ingest.test.ts && tsx src/services/traffic-flow-analytics.test.ts && tsx src/services/traffic-flow-map-hops.test.ts && tsx src/services/traffic-flow-hardening.test.ts && tsx src/services/traffic-flow-purge.test.ts",
+    "test:traffic-flow": "tsx src/services/traffic-flow-parse.test.ts && tsx src/services/traffic-flow-map-exporter.test.ts && tsx src/services/traffic-flow-ifaces.test.ts && tsx src/services/traffic-flow-dedup.test.ts && tsx src/services/traffic-flow-planes.test.ts && tsx src/services/traffic-flow-ip.test.ts && tsx src/services/traffic-flow-classify.test.ts && tsx src/services/traffic-flow-ripe.test.ts && tsx src/services/traffic-flow-brands.test.ts && tsx src/services/traffic-flow-ingest.test.ts && tsx src/services/traffic-flow-analytics.test.ts && tsx src/services/traffic-flow-map-hops.test.ts && tsx src/services/traffic-flow-hardening.test.ts && tsx src/services/traffic-flow-purge.test.ts && tsx src/services/sqlite-write-opt.test.ts",
     "test:users": "tsx src/modules/users/iface-type.test.ts && tsx src/modules/users/bindings.test.ts"
   },
   "dependencies": {

backend/src/db/index.ts

@@ -8,18 +8,85 @@ import { env } from "../config.js"
 import * as schema from "./schema.js"
 
 export const SQLITE_BUSY_TIMEOUT_MS = 5000
+/** ~16 MiB page cache (negative = KiB). */
+export const SQLITE_CACHE_SIZE_KIB = 16_000
+export const SQLITE_WAL_AUTOCHECKPOINT_PAGES = 1000
+
+export interface SqliteWriteStats {
+  insert: number
+  update: number
+  delete: number
+  walCheckpoint: number
+}
+
+let writeTrace: SqliteWriteStats | null = null
+
+function classifyWriteSql(sql: string): keyof Omit<SqliteWriteStats, "walCheckpoint"> | null {
+  const head = sql.trimStart().slice(0, 12).toUpperCase()
+  if (head.startsWith("INSERT")) return "insert"
+  if (head.startsWith("UPDATE")) return "update"
+  if (head.startsWith("DELETE")) return "delete"
+  return null
+}
+
+function installSqliteWriteTrace(handle: SqliteHandle): SqliteHandle {
+  const origPrepare = handle.prepare.bind(handle)
+  handle.prepare = ((sql: string) => {
+    const stmt = origPrepare(sql)
+    const kind = classifyWriteSql(sql)
+    if (!kind) return stmt
+    const origRun = stmt.run.bind(stmt)
+    stmt.run = ((...args: unknown[]) => {
+      if (writeTrace) writeTrace[kind] += 1
+      return origRun(...args)
+    }) as typeof stmt.run
+    return stmt
+  }) as typeof handle.prepare
+
+  const origExec = handle.exec.bind(handle)
+  handle.exec = ((sql: string) => {
+    if (writeTrace) {
+      for (const part of sql.split(";")) {
+        const kind = classifyWriteSql(part)
+        if (kind) writeTrace[kind] += 1
+      }
+    }
+    return origExec(sql)
+  }) as typeof handle.exec
+
+  const origPragma = handle.pragma.bind(handle)
+  handle.pragma = ((source: string, options?: { simple?: boolean }) => {
+    if (writeTrace && /wal_checkpoint/i.test(source)) writeTrace.walCheckpoint += 1
+    return origPragma(source, options as never)
+  }) as typeof handle.pragma
+
+  return handle
+}
+
+export function countSqliteWrites<T>(fn: () => T): { result: T; stats: SqliteWriteStats } {
+  const stats: SqliteWriteStats = { insert: 0, update: 0, delete: 0, walCheckpoint: 0 }
+  writeTrace = stats
+  try {
+    return { result: fn(), stats }
+  } finally {
+    writeTrace = null
+  }
+}
 
 export function applySqlitePragmas(handle: SqliteHandle): void {
   handle.pragma("journal_mode = WAL")
   handle.pragma("foreign_keys = ON")
   handle.pragma(`busy_timeout = ${SQLITE_BUSY_TIMEOUT_MS}`)
   handle.pragma("synchronous = NORMAL")
+  handle.pragma(`wal_autocheckpoint = ${SQLITE_WAL_AUTOCHECKPOINT_PAGES}`)
+  handle.pragma("temp_store = MEMORY")
+  handle.pragma(`cache_size = -${SQLITE_CACHE_SIZE_KIB}`)
 }
 
 function openSqlite(): SqliteHandle {
   const handle = new Database(env.DATABASE_PATH)
   applySqlitePragmas(handle)
-  return handle
+  return installSqliteWriteTrace(handle)
 }
 
 let sqlite = openSqlite()

backend/src/modules/servers/repository/servers-repository.ts

@@ -1,6 +1,7 @@
 import { desc, eq } from "drizzle-orm"
 import { db } from "../../../db/index.js"
 import { serverSnapshots, servers } from "../../../db/schema.js"
+import { invalidateFlowCatalogCache } from "../../../services/traffic-flow-topology.js"
 
 export type ServerRow = typeof servers.$inferSelect
 export type SnapshotRow = typeof serverSnapshots.$inferSelect
@@ -17,6 +18,7 @@ export function createServerRow(
   values: Omit<typeof servers.$inferInsert, "id">,
 ): ServerRow {
   const [inserted] = db.insert(servers).values(values).returning().all()
+  invalidateFlowCatalogCache()
   return inserted
 }
 
@@ -25,11 +27,13 @@ export function updateServerRowById(
   values: Partial<ServerRow>,
 ): ServerRow {
   const [updated] = db.update(servers).set(values).where(eq(servers.id, id)).returning().all()
+  invalidateFlowCatalogCache()
   return updated
 }
 
 export function deleteServerRowById(id: number): void {
   db.delete(servers).where(eq(servers.id, id)).run()
+  invalidateFlowCatalogCache()
 }
 
 export function listSnapshotsByServerId(serverId: number, limit: number): SnapshotRow[] {

backend/src/modules/users/repository/users-repository.ts

@@ -1,6 +1,7 @@
-import { and, eq } from "drizzle-orm"
+import { and, count, eq } from "drizzle-orm"
 import { db } from "../../../db/index.js"
 import { appUsers, userInterfaceBindings } from "../../../db/schema.js"
+import { invalidateFlowCatalogCache } from "../../../services/traffic-flow-topology.js"
 
 export type AppUserRow = typeof appUsers.$inferSelect
 export type BindingRow = typeof userInterfaceBindings.$inferSelect
@@ -19,6 +20,7 @@ export function getUserRowByLogin(login: string): AppUserRow | undefined {
 
 export function createUserRow(values: typeof appUsers.$inferInsert): AppUserRow {
   const [inserted] = db.insert(appUsers).values(values).returning().all()
+  invalidateFlowCatalogCache()
   return inserted
 }
 
@@ -27,11 +29,13 @@ export function updateUserRowById(
   values: Partial<AppUserRow>,
 ): AppUserRow {
   const [updated] = db.update(appUsers).set(values).where(eq(appUsers.id, id)).returning().all()
+  invalidateFlowCatalogCache()
   return updated
 }
 
 export function deleteUserRowById(id: string): void {
   db.delete(appUsers).where(eq(appUsers.id, id)).run()
+  invalidateFlowCatalogCache()
 }
 
 export function listBindingRows(): BindingRow[] {
@@ -65,13 +69,15 @@ export function getBindingByServerIfacePeer(
 
 export function createBindingRow(values: typeof userInterfaceBindings.$inferInsert): BindingRow {
   const [inserted] = db.insert(userInterfaceBindings).values(values).returning().all()
+  invalidateFlowCatalogCache()
   return inserted
 }
 
 export function deleteBindingRowById(id: string): void {
   db.delete(userInterfaceBindings).where(eq(userInterfaceBindings.id, id)).run()
+  invalidateFlowCatalogCache()
 }
 
 export function countUserRows(): number {
-  return db.select().from(appUsers).all().length
+  return db.select({ n: count() }).from(appUsers).all()[0]?.n ?? 0
 }

backend/src/routes/sidebar-counts.ts

@@ -1,4 +1,5 @@
 import type { FastifyPluginAsyncZod } from "@fastify/type-provider-zod"
+import { count } from "drizzle-orm"
 import { listCertificatesFromServers } from "../services/certificates-service.js"
 import { countWireGuardInterfaces } from "../services/wireguard-live.js"
 import { db } from "../db/index.js"
@@ -11,27 +12,22 @@ import {
 } from "../db/schema.js"
 import { listUsers } from "../modules/users/service/users-service.js"
 
+function tableCount(table: typeof servers | typeof filterRules | typeof uptimeProbes | typeof uptimeSpeedProbes | typeof recursiveRoutes): number {
+  return db.select({ n: count() }).from(table).all()[0]?.n ?? 0
+}
+
 const sidebarCountsRoutes: FastifyPluginAsyncZod = async (app) => {
   app.get("/sidebar-counts", async (_req, reply) => {
-    const [
-      serversTotal,
-      filterRulesTotal,
-      uptimeProbesTotal,
-      uptimeSpeedProbesTotal,
-      recursiveRoutesTotal,
-      certificatesTotal,
-      wireguardTotal,
-      usersTotal,
-    ] = await Promise.all([
-      Promise.resolve(db.select().from(servers).all().length),
-      Promise.resolve(db.select().from(filterRules).all().length),
-      Promise.resolve(db.select().from(uptimeProbes).all().length),
-      Promise.resolve(db.select().from(uptimeSpeedProbes).all().length),
-      Promise.resolve(db.select().from(recursiveRoutes).all().length),
+    const serversTotal = tableCount(servers)
+    const filterRulesTotal = tableCount(filterRules)
+    const uptimeProbesTotal = tableCount(uptimeProbes)
+    const uptimeSpeedProbesTotal = tableCount(uptimeSpeedProbes)
+    const recursiveRoutesTotal = tableCount(recursiveRoutes)
+    const [certificatesTotal, wireguardTotal] = await Promise.all([
       listCertificatesFromServers().then((res) => res.certificates.length),
       countWireGuardInterfaces().catch(() => 0),
-      Promise.resolve(listUsers().length),
     ])
+    const usersTotal = listUsers().length
 
     return reply.send({
       servers: serversTotal,

backend/src/services/alert-engine/prev-live-store.ts

@@ -37,11 +37,12 @@ export function savePrevLiveMap(kind: PrevLiveKind, map: PrevLiveStringMap) {
     .limit(1)
     .all()[0]
   if (existing) {
+    if (existing.payloadJson === payloadJson) return
     db.update(alertEnginePrevLive)
       .set({ payloadJson, updatedAt: new Date().toISOString() })
       .where(eq(alertEnginePrevLive.kind, kind))
       .run()
-  } else {
-    db.insert(alertEnginePrevLive).values({ kind, payloadJson, updatedAt: new Date().toISOString() }).run()
+    return
   }
+  db.insert(alertEnginePrevLive).values({ kind, payloadJson, updatedAt: new Date().toISOString() }).run()
 }

backend/src/services/gre-bgp-snapshot-collector.ts

@@ -1,5 +1,3 @@
-import { db, sqliteDatabase } from "../db/index.js"
-import { alertBgpPeerSamples, alertGreTunnelSamples } from "../db/schema.js"
 import { bgpPeerAlertKey, fetchBgpSessionsForAlerts } from "./bgp-peers-live.js"
 import { fetchGreTunnelLiveRows } from "./gre-tunnels-live.js"
 import type { GreBgpSnapshotRunSnapshot } from "../types/scheduler-run-snapshot.js"
@@ -12,8 +10,8 @@ export function getGreBgpSnapshotCollectorState(): { running: boolean } {
 }
 
 /**
- * Один опрос GRE + BGP по включённым серверам и запись строк в SQLite для `buildSignalSnapshot`.
- * Движок оповещений больше не дублирует эти REST-запросы.
+ * Один опрос GRE + BGP по включённым серверам.
+ * Снимок для алертов живёт в `scheduler_runs.result_json` (`greTunnels` / `bgpPeers`).
  */
 export async function collectGreBgpSnapshotOnce(): Promise<GreBgpSnapshotRunSnapshot> {
   const sampledAt = new Date().toISOString()
@@ -62,32 +60,8 @@ export async function collectGreBgpSnapshotOnce(): Promise<GreBgpSnapshotRunSnap
     const bgpRows = bgpSettled.status === "fulfilled" ? bgpSettled.value : []
     snapshot.greTunnels = greRows.map((r) => ({ targetLabel: r.targetLabel, status: r.status }))
     snapshot.bgpPeers = bgpRows.map((s) => ({ key: bgpPeerAlertKey(s), state: s.state }))
-
-    db.transaction((tx) => {
-      for (const r of greRows) {
-        tx.insert(alertGreTunnelSamples).values({
-          sampledAt,
-          targetLabel: r.targetLabel,
-          status: r.status,
-        }).run()
-        snapshot.greWritten += 1
-      }
-      for (const s of bgpRows) {
-        tx.insert(alertBgpPeerSamples).values({
-          sampledAt,
-          peerKey: bgpPeerAlertKey(s),
-          state: s.state,
-        }).run()
-        snapshot.bgpWritten += 1
-      }
-    })
-
-    sqliteDatabase
-      .prepare(`DELETE FROM alert_gre_tunnel_samples WHERE sampled_at < datetime('now', '-30 days')`)
-      .run()
-    sqliteDatabase
-      .prepare(`DELETE FROM alert_bgp_peer_samples WHERE sampled_at < datetime('now', '-30 days')`)
-      .run()
+    snapshot.greWritten = greRows.length
+    snapshot.bgpWritten = bgpRows.length
 
     if (errors.length) snapshot.errors = errors
   } catch (e) {

backend/src/services/poller.ts

@@ -5,6 +5,7 @@ import type { SnapshotInsert } from "../db/schema.js"
 import type { SnapshotRead } from "../types/server.js"
 import { MikrotikClient } from "./mikrotik.js"
 import { parseRosCpuLoadPercent, parseRosDataSizeBytes } from "./ros-metric-parse.js"
+import { invalidateFlowCatalogCache } from "./traffic-flow-topology.js"
 
 // ── pollServer ─────────────────────────────────────────────────────────────────
 
@@ -64,11 +65,13 @@ export async function pollServer(serverId: number): Promise<SnapshotRead> {
       rawIpAddresses: JSON.stringify(addresses),
     } satisfies Partial<SnapshotInsert>)
 
-    // Keep server.name in sync with RouterOS identity
-    db.update(servers)
-      .set({ name: identity.name, updatedAt: now })
-      .where(eq(servers.id, serverId))
-      .run()
+    if ((identity.name || "") !== (server.name || "")) {
+      db.update(servers)
+        .set({ name: identity.name, updatedAt: now })
+        .where(eq(servers.id, serverId))
+        .run()
+      invalidateFlowCatalogCache()
+    }
 
   } catch (err) {
     // Log but don't throw — we still persist the offline snapshot

backend/src/services/scheduler.ts

@@ -7,7 +7,7 @@
  * 3. `uptime_speed` — ниже (BW-test, тяжёлый); локи узлов — `withBtestNodeLocks` в speed-сервисе.
  *
  * **Оповещения (`alert_engine`):** читают SQLite после джоб сбора (см. `buildSignalSnapshot`), в т.ч.
- * `gre_bgp` → `alert_gre_tunnel_samples` / `alert_bgp_peer_samples`. После успешного завершения джоб
+ * `gre_bgp` → snapshot в `scheduler_runs.result_json` (`greTunnels` / `bgpPeers`). После успешного завершения джоб
  * `traffic`, `uptime_*`, `servers_rest_ping`, `gre_bgp` планируется **дополнительный** прогон движка
  * (debounce), см. [`alert-collector-hooks.ts`](./alert-collector-hooks.ts); любой другой писатель сэмплов
  * для снимка оповещений тоже должен вызывать `scheduleAlertEngineAfterDataCollectors()` после коммита.
@@ -17,7 +17,7 @@
  */
 import { desc, eq, lt } from "drizzle-orm"
 import { db } from "../db/index.js"
-import { schedulerRuns } from "../db/schema.js"
+import { events, schedulerRuns } from "../db/schema.js"
 import type { SchedulerRunSnapshot } from "../types/scheduler-run-snapshot.js"
 import { SCHEDULER_RUN_SNAPSHOT_VERSION } from "../types/scheduler-run-snapshot.js"
 import {
@@ -71,6 +71,20 @@ const timers = new Map<string, ReturnType<typeof setInterval>>()
 
 const RUN_LOG_RETENTION_MS = 30 * 24 * 60 * 60 * 1000
 
+const QUIET_SCHEDULER_OK_JOBS = new Set<SchedulerJobKey>([
+  "traffic",
+  "servers_rest_ping",
+  "uptime_resources",
+  "uptime_ping",
+  "uptime_speed",
+  "gre_bgp",
+  "alert_engine",
+])
+
+export function shouldAppendSchedulerOkEvent(jobKey: SchedulerJobKey): boolean {
+  return !QUIET_SCHEDULER_OK_JOBS.has(jobKey)
+}
+
 function newRunId(): string {
   return `sch-${Date.now()}-${Math.random().toString(36).slice(2, 10)}`
 }
@@ -84,18 +98,21 @@ function appendSchedulerRun(row: {
   durationMs: number
   result?: SchedulerRunSnapshot | null
 }) {
-  db.insert(schedulerRuns).values({
-    id: newRunId(),
-    jobKey: row.jobKey,
-    startedAt: row.startedAt,
-    finishedAt: row.finishedAt,
-    status: row.status,
-    error: row.error,
-    durationMs: row.durationMs,
-    resultJson: row.result ? JSON.stringify(row.result) : null,
-  }).run()
   const cutoff = new Date(Date.now() - RUN_LOG_RETENTION_MS).toISOString()
-  db.delete(schedulerRuns).where(lt(schedulerRuns.finishedAt, cutoff)).run()
+  db.transaction((tx) => {
+    tx.insert(schedulerRuns).values({
+      id: newRunId(),
+      jobKey: row.jobKey,
+      startedAt: row.startedAt,
+      finishedAt: row.finishedAt,
+      status: row.status,
+      error: row.error,
+      durationMs: row.durationMs,
+      resultJson: row.result ? JSON.stringify(row.result) : null,
+    }).run()
+    tx.delete(schedulerRuns).where(lt(schedulerRuns.finishedAt, cutoff)).run()
+    tx.delete(events).where(lt(events.createdAt, cutoff)).run()
+  })
 }
 
 async function runSchedulerJobBody(jobKey: SchedulerJobKey): Promise<void> {
@@ -159,19 +176,21 @@ async function runSchedulerJobBody(jobKey: SchedulerJobKey): Promise<void> {
       durationMs: Date.now() - startedAt,
       result: snapshot ?? null,
     })
-    appendEvent({
-      level: "info",
-      eventType: "scheduler.job.ok",
-      sourceModule: "scheduler",
-      title: "Задача планировщика завершена",
-      message: `${jobKey}: выполнено за ${Date.now() - startedAt} мс`,
-      entityType: "job",
-      entityId: jobKey,
-      payload: {
-        startedAt: startedIso,
-        finishedAt: finishedIso,
-      },
-    })
+    if (shouldAppendSchedulerOkEvent(jobKey)) {
+      appendEvent({
+        level: "info",
+        eventType: "scheduler.job.ok",
+        sourceModule: "scheduler",
+        title: "Задача планировщика завершена",
+        message: `${jobKey}: выполнено за ${Date.now() - startedAt} мс`,
+        entityType: "job",
+        entityId: jobKey,
+        payload: {
+          startedAt: startedIso,
+          finishedAt: finishedIso,
+        },
+      })
+    }
     if (
       jobKey === "traffic" ||
       jobKey === "servers_rest_ping" ||

backend/src/services/sqlite-write-opt.test.ts

@@ -0,0 +1,144 @@
+import assert from "node:assert/strict"
+import { randomUUID } from "node:crypto"
+import { countSqliteWrites, sqliteDatabase } from "../db/index.js"
+import { events } from "../db/schema.js"
+import { db } from "../db/index.js"
+import {
+  attachEngineSqlite,
+  bumpPacketMeta,
+  configureEngine,
+  flushPending,
+  ingestParsedFlowsForServerForTests,
+  resetEngineForTests,
+  setEngineError,
+} from "./traffic-flow-engine.js"
+import { collectGreBgpSnapshotOnce } from "./gre-bgp-snapshot-collector.js"
+import { shouldAppendSchedulerOkEvent, executeSchedulerJob } from "./scheduler.js"
+import { savePrevLiveMap, loadPrevLiveMap } from "./alert-engine/prev-live-store.js"
+import {
+  invalidateFlowCatalogCache,
+  loadFlowTopology,
+  seedFlowTopologyForTests,
+} from "./traffic-flow-topology.js"
+
+resetEngineForTests()
+attachEngineSqlite(sqliteDatabase)
+seedFlowTopologyForTests(null)
+invalidateFlowCatalogCache()
+
+const idle1 = countSqliteWrites(() => {
+  flushPending()
+})
+assert.equal(idle1.stats.walCheckpoint, 0)
+assert.ok(idle1.stats.update >= 1, "first idle flush persists listener stats")
+
+const idle2 = countSqliteWrites(() => {
+  flushPending()
+})
+assert.equal(idle2.stats.update, 0, "unchanged listener stats skip UPDATE")
+assert.equal(idle2.stats.walCheckpoint, 0)
+
+bumpPacketMeta("203.0.113.9")
+const changed = countSqliteWrites(() => {
+  flushPending()
+})
+assert.equal(changed.stats.update, 1, "changed packets persist once")
+assert.equal(changed.stats.walCheckpoint, 0)
+
+setEngineError("boom")
+const errWrite = countSqliteWrites(() => {
+  flushPending()
+})
+assert.equal(errWrite.stats.update, 1)
+setEngineError("")
+flushPending()
+
+resetEngineForTests()
+configureEngine({ topN: 20 })
+ingestParsedFlowsForServerForTests(9, [{
+  src: "10.1.1.1",
+  dst: "8.8.8.8",
+  proto: 6,
+  srcPort: 40000,
+  dstPort: 443,
+  bytes: 100,
+  packets: 1,
+  inIface: "2",
+  outIface: "",
+}])
+const withData = countSqliteWrites(() => {
+  flushPending()
+})
+assert.equal(withData.stats.walCheckpoint, 0, "flush with data must not TRUNCATE WAL")
+assert.ok(withData.stats.insert >= 1, "flow upsert writes")
+
+sqliteDatabase.prepare(`DELETE FROM flow_buckets WHERE server_id = 9`).run()
+sqliteDatabase.prepare(`DELETE FROM flow_minute_stats WHERE server_id = 9`).run()
+sqliteDatabase.prepare(`DELETE FROM flow_minute_dims WHERE server_id = 9`).run()
+sqliteDatabase.prepare(`DELETE FROM flow_daily_dims WHERE server_id = 9`).run()
+
+const plan = sqliteDatabase.prepare(`
+  EXPLAIN QUERY PLAN
+  SELECT id FROM flow_buckets WHERE bucket_at >= ? ORDER BY bytes DESC LIMIT 100
+`).all("2000-01-01T00:00:00.000Z") as Array<{ detail?: string }>
+const planText = plan.map((p) => String(p.detail ?? "")).join(" | ")
+assert.ok(planText.length > 0, "EXPLAIN QUERY PLAN returned rows")
+
+invalidateFlowCatalogCache()
+seedFlowTopologyForTests(null)
+const topoA = loadFlowTopology()
+const topoB = loadFlowTopology()
+assert.equal(topoA, topoB, "topology cache returns same object")
+invalidateFlowCatalogCache()
+const topoC = loadFlowTopology()
+assert.notEqual(topoA, topoC, "invalidate rebuilds topology")
+
+assert.equal(shouldAppendSchedulerOkEvent("traffic"), false)
+assert.equal(shouldAppendSchedulerOkEvent("alert_engine"), false)
+assert.equal(shouldAppendSchedulerOkEvent("gre_bgp"), false)
+assert.equal(shouldAppendSchedulerOkEvent("backups"), true)
+assert.equal(shouldAppendSchedulerOkEvent("certificates_renew"), true)
+assert.equal(shouldAppendSchedulerOkEvent("internet_path"), true)
+
+savePrevLiveMap("gre", { a: "up" })
+const prevSame = countSqliteWrites(() => {
+  savePrevLiveMap("gre", { a: "up" })
+})
+assert.equal(prevSame.stats.update, 0)
+assert.equal(prevSame.stats.insert, 0)
+savePrevLiveMap("gre", { a: "down" })
+assert.equal(loadPrevLiveMap("gre").a, "down")
+savePrevLiveMap("gre", { a: "up" })
+
+const greBefore = sqliteDatabase.prepare(`SELECT COUNT(*) AS n FROM alert_gre_tunnel_samples`).get() as { n: number }
+const bgpBefore = sqliteDatabase.prepare(`SELECT COUNT(*) AS n FROM alert_bgp_peer_samples`).get() as { n: number }
+await collectGreBgpSnapshotOnce()
+const greAfter = sqliteDatabase.prepare(`SELECT COUNT(*) AS n FROM alert_gre_tunnel_samples`).get() as { n: number }
+const bgpAfter = sqliteDatabase.prepare(`SELECT COUNT(*) AS n FROM alert_bgp_peer_samples`).get() as { n: number }
+assert.equal(greAfter.n, greBefore.n)
+assert.equal(bgpAfter.n, bgpBefore.n)
+
+const oldId = `evt-old-${randomUUID()}`
+db.insert(events).values({
+  id: oldId,
+  createdAt: new Date(Date.now() - 40 * 24 * 60 * 60 * 1000).toISOString(),
+  level: "info",
+  eventType: "test.retention",
+  sourceModule: "system",
+  title: "old",
+  message: "old",
+}).run()
+const eventsBefore = sqliteDatabase.prepare(
+  `SELECT COUNT(*) AS n FROM events WHERE event_type = 'scheduler.job.ok' AND entity_id = 'alert_engine'`,
+).get() as { n: number }
+await executeSchedulerJob("alert_engine")
+const oldGone = sqliteDatabase.prepare(`SELECT COUNT(*) AS n FROM events WHERE id = ?`).get(oldId) as { n: number }
+assert.equal(oldGone.n, 0, "events older than 30 days are purged")
+const eventsAfter = sqliteDatabase.prepare(
+  `SELECT COUNT(*) AS n FROM events WHERE event_type = 'scheduler.job.ok' AND entity_id = 'alert_engine'`,
+).get() as { n: number }
+assert.equal(eventsAfter.n, eventsBefore.n, "quiet jobs do not append scheduler.job.ok")
+
+resetEngineForTests()
+console.log("sqlite-write-opt.test.ts: ok")
+console.log("EXPLAIN listStoredFlowRows:", planText)

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

@@ -1,6 +1,6 @@
 import { eq } from "drizzle-orm"
 import { db, sqliteDatabase } from "../db/index.js"
-import { appUsers, servers, userInterfaceBindings } from "../db/schema.js"
+import { appUsers, userInterfaceBindings } from "../db/schema.js"
 import type {
   FlowAnalyticsDto,
   FlowBreakdownRow,
@@ -21,7 +21,7 @@ import {
   listFlowRowsForWindow,
   type PendingFlowRow,
 } from "./traffic-flow-ingest.js"
-import { MAX_PENDING, RING_OVERLAY } from "./traffic-flow-engine.js"
+import { flowDataEpoch, MAX_PENDING, RING_OVERLAY } from "./traffic-flow-engine.js"
 import { resolveIfaceName } from "./traffic-flow-ifaces.js"
 import { getTrafficFlowSettingsRow, listHostPeers } from "./traffic-flow-settings.js"
 import { applicationName, flowRowMatchesFilter } from "./traffic-flow-apps.js"
@@ -33,6 +33,7 @@ import { classifyFlowPlane, flowBps, shouldKeepPlane } from "./traffic-flow-plan
 import { pickInternetPeer } from "./traffic-flow-ip.js"
 import {
   enGreIfaceNames,
+  getServerCatalog,
   latestWireBps,
   loadFlowTopology,
   resolveClient,
@@ -142,14 +143,46 @@ function topLabel(map: Map<string, { bytes: number; packets: number; label?: str
 }
 
 export function buildFlowAnalytics(q: FlowAnalyticsQuery): FlowAnalyticsDto {
+  const key = analyticsQueryKey(q)
+  const now = Date.now()
+  if (analyticsCache && analyticsCache.key === key && now - analyticsCache.at < ANALYTICS_CACHE_TTL_MS) {
+    return analyticsCache.dto
+  }
+  const dto = buildFlowAnalyticsUncached(q)
+  analyticsCache = { key, at: now, dto }
+  return dto
+}
+
+export function resetFlowAnalyticsCacheForTests(): void {
+  analyticsCache = null
+}
+
+function analyticsQueryKey(q: FlowAnalyticsQuery): string {
+  return JSON.stringify({
+    epoch: flowDataEpoch(),
+    minutes: q.minutes,
+    serverId: q.serverId ?? null,
+    userId: q.userId ?? null,
+    iface: q.iface ?? null,
+    dedup: q.dedup !== false,
+    excludeMesh: q.excludeMesh !== false,
+    excludeOverlay: q.excludeOverlay !== false,
+    skipHeavy: Boolean(q.skipHeavy),
+  })
+}
+
+const ANALYTICS_CACHE_TTL_MS = 2000
+let analyticsCache: { key: string; at: number; dto: FlowAnalyticsDto } | null = null
+
+function buildFlowAnalyticsUncached(q: FlowAnalyticsQuery): FlowAnalyticsDto {
   const settings = getTrafficFlowSettingsRow()
   const top = Math.min(50, Math.max(10, settings.topN))
   const windowSec = Math.max(60, q.minutes * 60)
   const raw = listFlowRowsForWindow(q.minutes)
   const allow = q.userId ? userIfaceAllow(q.userId) : null
-  const serverRows = db.select().from(servers).all()
-  const nameById = new Map(serverRows.map((s) => [s.id, s.name || s.host]))
-  const countryById = new Map(serverRows.map((s) => [s.id, (s.country || "").toUpperCase() || "UN"]))
+  const catalog = getServerCatalog()
+  const nameById = new Map([...catalog.byId].map(([id, s]) => [id, s.name]))
+  const countryById = new Map([...catalog.byId].map(([id, s]) => [id, s.country]))
   const ifaceFilter = q.iface && q.iface !== "__all__" ? q.iface : ""
   const wantDedup = q.dedup !== false && !ifaceFilter
   const excludeMesh = q.excludeMesh !== false
@@ -478,19 +511,19 @@ export function listFlowExporters(minutes: number): FlowExportersDto {
   const { bytes, sessions } = summarizeByServer(rows)
   const ids = new Set<number>([...bytes.keys()])
   for (const p of listHostPeers()) ids.add(p.serverId)
-  const serverRows = db.select().from(servers).all()
+  const catalog = getServerCatalog()
   const emptySeries = Array(60).fill(0) as number[]
-  const exporters = serverRows
+  const exporters = catalog.list
     .filter((s) => ids.has(s.id))
     .map((s) => {
       const ring = getRingMbps(s.id, "__all__")
       const total = bytes.get(s.id) ?? 0
       return {
         id: String(s.id),
-        name: s.name || s.host,
+        name: s.name,
         subtitle: s.host,
-        site: s.site || "—",
-        country: s.country || "UN",
+        site: s.site,
+        country: s.country,
         status: snapshotStatus(s.id),
         rxNow: ring.rxNow || (total * 8) / Math.max(60, minutes * 60) / 1_000_000,
         txNow: ring.txNow,

backend/src/services/traffic-flow-engine.ts

@@ -4,7 +4,8 @@ import { classifyFlowPlaneLite } from "./traffic-flow-planes.js"
 import { pickServerIdForExporter, type OverlayPeerRef } from "./traffic-flow-map-exporter.js"
 import { applicationName } from "./traffic-flow-apps.js"
 import { classifyFlowDst } from "./traffic-flow-classify.js"
-import { enqueueRipeMisses, lookupRipeCached } from "./traffic-flow-ripe.js"
+import { enqueueRipeMisses, lookupRipeCached, pruneRipeSqlite } from "./traffic-flow-ripe.js"
+import { invalidateTrafficFlowSettingsCache } from "./traffic-flow-settings.js"
 import { isIsoCountry } from "./traffic-flow-brands.js"
 import { maybeRefreshIfaces } from "./traffic-flow-ifaces.js"
 import { pickInternetPeer } from "./traffic-flow-ip.js"
@@ -94,10 +95,27 @@ let dropped = 0
 let rowsStored = 0
 let lastFlushUsedTransaction = false
 let lastPruneAt = 0
+let lastPassiveCheckpointAt = Date.now()
+let dataEpoch = 0
+let lastPersistedStats: {
+  packetsReceived: number
+  lastDatagramAt: string | null
+  lastExporterIp: string | null
+  lastError: string
+} | null = null
 let exporterCtx: ExporterResolveCtx | null = null
 
 const PRUNE_MS = 5 * 60_000
 const LIVE_WINDOW_MS = 15 * 60_000
+const PASSIVE_CHECKPOINT_MS = 60_000
+
+function bumpDataEpoch(): void {
+  dataEpoch += 1
+}
+
+export function flowDataEpoch(): number {
+  return dataEpoch
+}
 
 function nowIso(): string {
   return new Date().toISOString()
@@ -234,6 +252,7 @@ export function getEngineStats(): EngineStats {
 }
 
 export function queueParsedFlows(serverId: number, flows: ParsedFlowInput[]): void {
+  if (flows.length) bumpDataEpoch()
   const bucketAt = minuteBucketIso()
   const ripeMisses: string[] = []
   for (const raw of flows) {
@@ -422,7 +441,16 @@ export function applyRingSnapshot(rows: Array<{ key: string; inBps: number[]; ou
   }
 }
 
-function persistListenerStats(handle: SqliteHandle): void {
+function persistListenerStats(handle: SqliteHandle): boolean {
+  if (
+    lastPersistedStats
+    && lastPersistedStats.packetsReceived === packetsReceived
+    && lastPersistedStats.lastDatagramAt === lastDatagramAt
+    && lastPersistedStats.lastExporterIp === lastExporterIp
+    && lastPersistedStats.lastError === lastError
+  ) {
+    return false
+  }
   handle.prepare(`
     UPDATE traffic_flow_settings
     SET packets_received = @packetsReceived,
@@ -438,6 +466,25 @@ function persistListenerStats(handle: SqliteHandle): void {
     lastError,
     updatedAt: nowIso(),
   })
+  lastPersistedStats = {
+    packetsReceived,
+    lastDatagramAt,
+    lastExporterIp,
+    lastError,
+  }
+  invalidateTrafficFlowSettingsCache()
+  return true
+}
+
+function maybePassiveCheckpoint(handle: SqliteHandle): void {
+  const now = Date.now()
+  if (now - lastPassiveCheckpointAt < PASSIVE_CHECKPOINT_MS) return
+  lastPassiveCheckpointAt = now
+  try {
+    handle.pragma("wal_checkpoint(PASSIVE)")
+  } catch {
+    /* ignore */
+  }
 }
 
 function upsertMinuteAndDaily(handle: SqliteHandle): void {
@@ -586,6 +633,7 @@ function pruneStored(handle: SqliteHandle): void {
       }
     }
   }
+  pruneRipeSqlite(now)
 }
 
 function topNPending(rows: PendingFlowRow[]): PendingFlowRow[] {
@@ -616,6 +664,7 @@ export function flushPending(): void {
   persistListenerStats(handle)
   if (pending.size === 0 && minuteRollup.size === 0 && minuteDims.size === 0) {
     pruneStored(handle)
+    maybePassiveCheckpoint(handle)
     lastFlushUsedTransaction = false
     return
   }
@@ -665,6 +714,7 @@ export function flushPending(): void {
     tx(rows)
     lastFlushUsedTransaction = true
     rowsStored += rows.length
+    bumpDataEpoch()
   } catch {
     for (const r of rows) {
       try {
@@ -697,11 +747,7 @@ export function flushPending(): void {
     /* rollup best-effort */
   }
   pruneStored(handle)
-  try {
-    handle.pragma("wal_checkpoint(TRUNCATE)")
-  } catch {
-    /* ignore */
-  }
+  maybePassiveCheckpoint(handle)
 }
 
 export function lastFlushUsedTransactionForTests(): boolean {
@@ -736,6 +782,9 @@ export function resetEngineForTests(): void {
   rowsStored = 0
   lastFlushUsedTransaction = false
   lastPruneAt = 0
+  lastPassiveCheckpointAt = Date.now()
+  lastPersistedStats = null
+  bumpDataEpoch()
   pendingCap = MAX_PENDING
 }
 

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

@@ -1,5 +1,10 @@
 import assert from "node:assert/strict"
-import { SQLITE_BUSY_TIMEOUT_MS, sqliteDatabase } from "../db/index.js"
+import {
+  SQLITE_BUSY_TIMEOUT_MS,
+  SQLITE_CACHE_SIZE_KIB,
+  SQLITE_WAL_AUTOCHECKPOINT_PAGES,
+  sqliteDatabase,
+} from "../db/index.js"
 import {
   MAX_FLOW_LIVE_SUBSCRIBERS,
   resetFlowLiveSlotsForTests,
@@ -11,6 +16,16 @@ const busy = sqliteDatabase.pragma("busy_timeout") as Array<{ busy_timeout: numb
 const busyValue = Array.isArray(busy) ? Number(Object.values(busy[0] ?? {})[0]) : Number(busy)
 assert.equal(busyValue, SQLITE_BUSY_TIMEOUT_MS)
 
+function pragmaNum(name: string): number {
+  const rows = sqliteDatabase.pragma(name) as Array<Record<string, number>>
+  const row = Array.isArray(rows) ? rows[0] : rows
+  return Number(Object.values(row ?? {})[0])
+}
+
+assert.equal(pragmaNum("wal_autocheckpoint"), SQLITE_WAL_AUTOCHECKPOINT_PAGES)
+assert.equal(pragmaNum("cache_size"), -SQLITE_CACHE_SIZE_KIB)
+assert.equal(pragmaNum("temp_store"), 2)
+
 resetFlowLiveSlotsForTests()
 for (let i = 0; i < MAX_FLOW_LIVE_SUBSCRIBERS; i++) {
   assert.equal(tryAcquireFlowLiveSlot(), true)

backend/src/services/traffic-flow-ingest.ts

@@ -33,6 +33,7 @@ import {
 } from "./traffic-flow-settings.js"
 import { applicationName } from "./traffic-flow-apps.js"
 import { resolveIfaceName } from "./traffic-flow-ifaces.js"
+import { getServerCatalog } from "./traffic-flow-topology.js"
 
 export type { PendingFlowRow }
 
@@ -332,8 +333,8 @@ export function listFlowTalkers(minutes = 5): FlowStatsDto {
   const settings = getTrafficFlowSettingsRow()
   const runtime = getFlowRuntimeCounters()
   const rows = listFlowRowsForWindow(minutes)
-  const serverRows = db.select().from(servers).all()
-  const nameById = new Map(serverRows.map((s) => [s.id, s.name || s.host]))
+  const catalog = getServerCatalog()
+  const nameById = new Map([...catalog.byId].map(([id, s]) => [id, s.name]))
   const agg = new Map<string, FlowTalkerDto & { rawBytes: number }>()
   const protoBytes = new Map<number, number>()
   const srcs = new Set<string>()

backend/src/services/traffic-flow-map-hops.ts

@@ -1,7 +1,7 @@
 import { eq } from "drizzle-orm"
 import type { FlowMapHop, FlowMapHopsDto, FlowMapService, FlowMapServiceEdge, FlowMapServicePath } from "@mmapp/contracts/traffic-flow"
 import { db } from "../db/index.js"
-import { servers, userInterfaceBindings } from "../db/schema.js"
+import { userInterfaceBindings } from "../db/schema.js"
 import { applicationName, flowRowMatchesFilter } from "./traffic-flow-apps.js"
 import {
   isNamedInternetService,
@@ -15,7 +15,8 @@ import { classifyFlowPlane, shouldKeepPlane } from "./traffic-flow-planes.js"
 import { pickInternetPeer } from "./traffic-flow-ip.js"
 import { lookupRipeCached, type FlowIpMeta } from "./traffic-flow-ripe.js"
 import { getTrafficFlowSettingsRow } from "./traffic-flow-settings.js"
-import { loadFlowTopology, resolveClient, resolveEn } from "./traffic-flow-topology.js"
+import { loadFlowTopology, resolveClient, resolveEn, getServerCatalog } from "./traffic-flow-topology.js"
+import { flowDataEpoch } from "./traffic-flow-engine.js"
 
 export const DEFAULT_MAP_SERVICE_MIN_SHARE_PCT = 5
 export const MAP_SERVICE_NODE_CAP = 20
@@ -100,6 +101,7 @@ export function clampMapServiceMinSharePct(n: unknown): number {
 
 function hopsQueryKey(q: FlowMapHopsQuery, minSharePct: number): string {
   return JSON.stringify({
+    epoch: flowDataEpoch(),
     minutes: q.minutes,
     serverId: q.serverId ?? null,
     userId: q.userId ?? null,
@@ -194,8 +196,8 @@ function buildFlowMapHopsUncached(q: FlowMapHopsQuery, minSharePct: number): Flo
   const windowSec = Math.max(60, q.minutes * 60)
   const raw = listFlowRowsForWindow(q.minutes)
   const allow = q.userId ? userIfaceAllow(q.userId) : null
-  const serverRows = db.select().from(servers).all()
-  const nameById = new Map(serverRows.map((s) => [s.id, s.name || s.host]))
+  const catalog = getServerCatalog()
+  const nameById = new Map([...catalog.byId].map(([id, s]) => [id, s.name]))
   const ifaceFilter = q.iface && q.iface !== "__all__" ? q.iface : ""
   const wantDedup = q.dedup !== false && !ifaceFilter
   const excludeMesh = q.excludeMesh !== false

backend/src/services/traffic-flow-overlay.ts

@@ -21,6 +21,7 @@ import {
 } from "./traffic-flow-settings.js"
 import { refreshFlowExporterMap, startTrafficFlowListener } from "./traffic-flow-ingest.js"
 import { listTrafficFlowHostFiles } from "./traffic-flow-host-files.js"
+import { invalidateFlowCatalogCache } from "./traffic-flow-topology.js"
 
 const IFACE_NAME = "wg-flow"
 const JH_LISTEN_PORT = 13232
@@ -288,6 +289,7 @@ export async function applyFlowOverlay(
       mgmtTunnelIp: address,
       updatedAt: new Date().toISOString(),
     }).where(eq(servers.id, server.id)).run()
+    invalidateFlowCatalogCache()
 
     upsertHostPeer({
       serverId: server.id,

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

@@ -43,8 +43,8 @@ try {
   `).run(serverId)
   sqliteDatabase.prepare(`
     INSERT INTO flow_ip_meta (prefix, asn, country, holder, ok, fetched_at)
-    VALUES ('8.8.8.0/24', 15169, 'US', 'Google', 1, '2026-01-01T00:00:00.000Z')
-  `).run()
+    VALUES ('8.8.8.0/24', 15169, 'US', 'Google', 1, ?)
+  `).run(new Date().toISOString())
   sqliteDatabase.prepare(`
     UPDATE traffic_flow_settings SET packets_received = 42, last_exporter_ip = '10.255.254.3' WHERE id = 1
   `).run()

backend/src/services/traffic-flow-ripe.ts

@@ -239,6 +239,20 @@ function persistAsn(asn: number, holder: string): void {
   }
 }
 
+/** Удаляет просроченный RIPE-кэш с диска (hit 24h / negative 6h). */
+export function pruneRipeSqlite(nowMs = Date.now()): void {
+  if (!persistEnabled) return
+  try {
+    const hitCutoff = new Date(nowMs - HIT_TTL_MS).toISOString()
+    const negCutoff = new Date(nowMs - NEG_TTL_MS).toISOString()
+    sqliteDatabase.prepare(`DELETE FROM flow_ip_meta WHERE ok != 0 AND fetched_at < ?`).run(hitCutoff)
+    sqliteDatabase.prepare(`DELETE FROM flow_ip_meta WHERE ok = 0 AND fetched_at < ?`).run(negCutoff)
+    sqliteDatabase.prepare(`DELETE FROM flow_asn_meta WHERE fetched_at < ?`).run(hitCutoff)
+  } catch {
+    /* table may not exist in isolated tests */
+  }
+}
+
 function negative(prefix: string): FlowIpMeta {
   return {
     prefix,

backend/src/services/traffic-flow-settings.ts

@@ -4,10 +4,42 @@ import { trafficFlowSettings } from "../db/schema.js"
 import type { FlowHostPeer, TrafficFlowSettingsDto, TrafficFlowSettingsPatch } from "@mmapp/contracts/traffic-flow"
 import { generateWireGuardKeyPair } from "./wg-keys.js"
 
+let settingsRowCache: ReturnType<typeof readSettingsRow> | null = null
+
 function nowIso() {
   return new Date().toISOString()
 }
 
+export function invalidateTrafficFlowSettingsCache(): void {
+  settingsRowCache = null
+}
+
+function readSettingsRow() {
+  return db.select().from(trafficFlowSettings).where(eq(trafficFlowSettings.id, 1)).limit(1).all()[0]
+}
+
+export function getTrafficFlowSettingsRow() {
+  if (settingsRowCache) return settingsRowCache
+  const row = readSettingsRow()
+  if (row) {
+    settingsRowCache = row
+    return row
+  }
+  const now = nowIso()
+  db.insert(trafficFlowSettings).values({
+    id: 1,
+    enabled: false,
+    collectorIp: "10.255.254.1",
+    flowListenPort: 4739,
+    wgListenPort: 51821,
+    prefix: "10.255.254.0/24",
+    createdAt: now,
+    updatedAt: now,
+  }).run()
+  settingsRowCache = readSettingsRow()
+  return settingsRowCache!
+}
+
 function parsePeers(raw: string): FlowHostPeer[] {
   try {
     const parsed = JSON.parse(raw) as unknown
@@ -20,23 +52,6 @@ function parsePeers(raw: string): FlowHostPeer[] {
   }
 }
 
-export function getTrafficFlowSettingsRow() {
-  const row = db.select().from(trafficFlowSettings).where(eq(trafficFlowSettings.id, 1)).limit(1).all()[0]
-  if (row) return row
-  const now = nowIso()
-  db.insert(trafficFlowSettings).values({
-    id: 1,
-    enabled: false,
-    collectorIp: "10.255.254.1",
-    flowListenPort: 4739,
-    wgListenPort: 51821,
-    prefix: "10.255.254.0/24",
-    createdAt: now,
-    updatedAt: now,
-  }).run()
-  return db.select().from(trafficFlowSettings).where(eq(trafficFlowSettings.id, 1)).limit(1).all()[0]
-}
-
 export function toTrafficFlowSettingsDto(
   listener: { bound: boolean; address: string | null },
 ): TrafficFlowSettingsDto {
@@ -81,6 +96,7 @@ export function updateTrafficFlowSettings(patch: TrafficFlowSettingsPatch) {
       : Math.min(100, Math.max(0, patch.mapServiceMinSharePct)),
     updatedAt: nowIso(),
   }).where(eq(trafficFlowSettings.id, 1)).run()
+  invalidateTrafficFlowSettingsCache()
   return getTrafficFlowSettingsRow()
 }
 
@@ -95,6 +111,7 @@ export function ensureHostKeys(): { publicKey: string; created: boolean } {
     hostPrivateKey: keys.privateKey,
     updatedAt: nowIso(),
   }).where(eq(trafficFlowSettings.id, 1)).run()
+  invalidateTrafficFlowSettingsCache()
   return { publicKey: keys.publicKey, created: true }
 }
 
@@ -106,6 +123,7 @@ export function upsertHostPeer(peer: FlowHostPeer) {
     peersJson: JSON.stringify(peers),
     updatedAt: nowIso(),
   }).where(eq(trafficFlowSettings.id, 1)).run()
+  invalidateTrafficFlowSettingsCache()
 }
 
 export function recordFlowPacket(exporterIp: string) {
@@ -116,6 +134,7 @@ export function recordFlowPacket(exporterIp: string) {
     packetsReceived: row.packetsReceived + 1,
     updatedAt: nowIso(),
   }).where(eq(trafficFlowSettings.id, 1)).run()
+  invalidateTrafficFlowSettingsCache()
 }
 
 export function recordFlowListenerError(message: string) {
@@ -123,6 +142,7 @@ export function recordFlowListenerError(message: string) {
     lastError: message,
     updatedAt: nowIso(),
   }).where(eq(trafficFlowSettings.id, 1)).run()
+  invalidateTrafficFlowSettingsCache()
 }
 
 export function enableTrafficFlowIngest() {
@@ -130,6 +150,7 @@ export function enableTrafficFlowIngest() {
     enabled: true,
     updatedAt: nowIso(),
   }).where(eq(trafficFlowSettings.id, 1)).run()
+  invalidateTrafficFlowSettingsCache()
 }
 
 export function listHostPeers(): FlowHostPeer[] {
@@ -144,4 +165,5 @@ export function resetFlowIngestCounters(): void {
     lastError: "",
     updatedAt: nowIso(),
   }).where(eq(trafficFlowSettings.id, 1)).run()
+  invalidateTrafficFlowSettingsCache()
 }

backend/src/services/traffic-flow-topology.ts

@@ -27,7 +27,44 @@ export interface FlowTopology {
   plane: PlaneTopology
 }
 
+export interface ServerCatalogEntry {
+  id: number
+  name: string
+  country: string
+  host: string
+  type: string
+  site: string
+}
+
+const CATALOG_TTL_MS = 5_000
+
 let seeded: FlowTopology | null = null
+let topologyCache: { at: number; topo: FlowTopology } | null = null
+let serverCatalogCache: { at: number; list: ServerCatalogEntry[]; byId: Map<number, ServerCatalogEntry> } | null = null
+
+export function invalidateFlowCatalogCache(): void {
+  topologyCache = null
+  serverCatalogCache = null
+}
+
+export function getServerCatalog(): { list: ServerCatalogEntry[]; byId: Map<number, ServerCatalogEntry> } {
+  const now = Date.now()
+  if (serverCatalogCache && now - serverCatalogCache.at < CATALOG_TTL_MS) {
+    return serverCatalogCache
+  }
+  const rows = db.select().from(servers).all()
+  const list: ServerCatalogEntry[] = rows.map((s) => ({
+    id: s.id,
+    name: s.name || s.host,
+    country: (s.country || "").toUpperCase() || "UN",
+    host: s.host,
+    type: s.type,
+    site: s.site || "—",
+  }))
+  const byId = new Map(list.map((s) => [s.id, s]))
+  serverCatalogCache = { at: now, list, byId }
+  return serverCatalogCache
+}
 
 function parseWanUplinks(raw: string): Array<{ iface?: string; ip?: string }> {
   try {
@@ -44,6 +81,8 @@ function ifaceKey(serverId: number, name: string): string {
 
 export function loadFlowTopology(): FlowTopology {
   if (seeded) return seeded
+  const now = Date.now()
+  if (topologyCache && now - topologyCache.at < CATALOG_TTL_MS) return topologyCache.topo
   const serverRows = db.select().from(servers).all()
   const users = db.select().from(appUsers).all()
   const binds = db.select().from(userInterfaceBindings).all()
@@ -82,7 +121,7 @@ export function loadFlowTopology(): FlowTopology {
       for (const h of hosts) jhHosts.add(h)
     }
   }
-  return {
+  const topo: FlowTopology = {
     clientIfaces,
     clientByIface,
     enNodes,
@@ -95,10 +134,13 @@ export function loadFlowTopology(): FlowTopology {
       jhHosts,
     },
   }
+  topologyCache = { at: Date.now(), topo }
+  return topo
 }
 
 export function seedFlowTopologyForTests(topo: FlowTopology | null): void {
   seeded = topo
+  invalidateFlowCatalogCache()
 }
 
 export function resolveClient(