diff --git a/CHANGELOG.md b/CHANGELOG.md
index 401f0c3..5118a21 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -48,6 +48,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   `useAdminActivity`, `useAdminLogs`, `useWsQuery`), each with a barrel
   `index.ts`. All call sites have been updated to the new specific paths.
   No runtime behaviour change.
+- Frontend `types/index.ts` god-file split into topic-scoped modules
+  (`call.ts`, `config.ts`, `ws.ts`, `auth.ts`, `api.ts`, `admin.ts`,
+  `ui.ts`). The original `index.ts` is now a barrel that re-exports
+  everything, so all existing `@/types` imports keep working unchanged.
+  New code can also import from a specific module (e.g. `@/types/admin`).
 
 ### Fixed
 
diff --git a/frontend/src/types/admin.ts b/frontend/src/types/admin.ts
new file mode 100644
index 0000000..f0b9734
--- /dev/null
+++ b/frontend/src/types/admin.ts
@@ -0,0 +1,281 @@
+// Admin DTOs (mirrors of ADM/ADMRES payloads and admin REST envelopes).
+
+export interface AdminUser {
+  id: number;
+  username: string;
+  role: "admin" | "listener";
+  disabled: number; // 0 or 1
+  systemsJson: string | null;
+  expiration: number | null; // unix timestamp
+  limit: number | null; // concurrent connection limit
+  createdAt: number;
+  updatedAt: number;
+}
+
+export interface AdminSystem {
+  id: number;
+  systemId: number;
+  label: string;
+  autoPopulateTalkgroups: number;
+  blacklistsJson: string | null;
+  led: string | null;
+  order: number;
+}
+
+export interface AdminTalkgroup {
+  id: number;
+  systemId: number;
+  talkgroupId: number;
+  label: string | null;
+  name: string | null;
+  frequency: number | null;
+  led: string | null;
+  groupId: number | null;
+  tagId: number | null;
+  order: number;
+}
+
+export interface AdminUnit {
+  id: number;
+  systemId: number;
+  unitId: number;
+  label: string | null;
+  order: number;
+}
+
+export interface AdminGroup {
+  id: number;
+  label: string;
+}
+
+export interface AdminTag {
+  id: number;
+  label: string;
+}
+
+export interface AdminApiKey {
+  id: number;
+  fingerprint: string;
+  ident: string | null;
+  disabled: number;
+  systemsJson: string | null;
+  callRateLimit: number | null;
+  order: number;
+}
+
+export interface AdminApiKeyCreateResponse extends AdminApiKey {
+  createdKey: string;
+}
+
+export interface AdminDownstream {
+  id: number;
+  url: string;
+  hasApiKey: boolean;
+  systemsJson: string | null;
+  disabled: number;
+  order: number;
+}
+
+export interface AdminDownstreamCreate {
+  url: string;
+  apiKey: string;
+  systemsJson: string | null;
+  disabled: number;
+  order: number;
+}
+
+export interface AdminDownstreamUpdate {
+  id: number;
+  url: string;
+  apiKey: string;
+  systemsJson: string | null;
+  disabled: number;
+  order: number;
+}
+
+export interface AdminWebhook {
+  id: number;
+  url: string;
+  type: string;
+  secret: string | null;
+  systemsJson: string | null;
+  disabled: number;
+  order: number;
+}
+
+export interface AdminSetting {
+  key: string;
+  value: string;
+}
+
+export interface Capabilities {
+  ffmpeg: boolean;
+  fdkAac: boolean;
+  whisper: boolean;
+}
+
+export interface ConfigResponse {
+  settings: AdminSetting[];
+  capabilities: Capabilities;
+}
+
+export interface AdminLog {
+  dateTime: number;
+  level: string;
+  message: string;
+  attrs?: Record<string, string>;
+}
+
+// User create/update payload
+export interface CreateUserPayload {
+  username: string;
+  password: string;
+  role: "admin" | "listener";
+  disabled?: number;
+  systemsJson?: string | null;
+  expiration?: number | null;
+  limit?: number | null;
+}
+
+export interface UpdateUserPayload {
+  username?: string;
+  password?: string;
+  role?: "admin" | "listener";
+  disabled?: number;
+  systemsJson?: string | null;
+  expiration?: number | null;
+  limit?: number | null;
+}
+
+export interface AdminDirMonitor {
+  id: number;
+  directory: string;
+  type: string;
+  mask: string | null;
+  extension: string | null;
+  frequency: number | null;
+  delay: number | null;
+  deleteAfter: number;
+  usePolling: number;
+  disabled: number;
+  systemId: number | null;
+  talkgroupId: number | null;
+  order: number;
+}
+
+// --- RadioReference enrichment types ---
+
+export interface RRTalkgroupCandidate {
+  row: number;
+  talkgroupId: number;
+  label?: string;
+  name?: string;
+  group?: string;
+  tag?: string;
+  led?: string;
+  order?: number;
+}
+
+export interface RRPreviewRow extends RRTalkgroupCandidate {
+  matched: boolean;
+  wouldUpdate: boolean;
+  wouldUpdateFields: string[];
+  skipReason?: string;
+}
+
+export interface RRRowError {
+  row: number;
+  reason: string;
+}
+
+export interface RRPreviewResponse {
+  processed: number;
+  matched: number;
+  wouldUpdate: number;
+  skipped: number;
+  errors: number;
+  rowErrors: RRRowError[];
+  rows: RRPreviewRow[];
+}
+
+export interface RRApplyRequest {
+  systemId: number;
+  candidates: RRTalkgroupCandidate[];
+  mergeMode: string;
+  selectedFields: string[];
+}
+
+export interface RRApplyResponse {
+  processed: number;
+  matched: number;
+  updated: number;
+  skipped: number;
+  errors: number;
+  rowErrors: RRRowError[];
+}
+
+// --- Shared Links (admin) ---
+
+export interface SharedLinkAdmin {
+  id: number;
+  callId: number;
+  token: string;
+  createdAt: number;
+  sharedBy: string;
+  dateTime: number;
+  duration: number;
+  systemLabel: string;
+  talkgroupLabel: string;
+  talkgroupName: string;
+  expiresAt: number | null;
+}
+
+// --- Server filesystem types ---
+
+export interface ServerDirectoryEntry {
+  name: string;
+  path: string;
+}
+
+export interface ServerDirectoryListResponse {
+  path: string;
+  parent: string | null;
+  directories: ServerDirectoryEntry[];
+}
+
+// --- Transcription types ---
+
+export interface TranscriptionStatus {
+  enabled: boolean;
+  url: string;
+  model: string;
+  language: string;
+  diarize: boolean;
+  liveDisplay: boolean;
+  connected: boolean;
+}
+
+export interface WhisperModel {
+  id: string;
+  object: string;
+  path: string;
+  created: number;
+  owned_by: string;
+}
+
+export interface TranscriptionModelsResponse {
+  object: string;
+  models: WhisperModel[];
+}
+
+export interface TranscriptionStats {
+  total: number;
+  recent24h: number;
+  avgDurationMs: number;
+  minDurationMs: number;
+  maxDurationMs: number;
+  queueDepth: number;
+  poolEnabled: boolean;
+  byLanguage: { language: string; count: number }[];
+  byModel: { model: string; count: number }[];
+}
diff --git a/frontend/src/types/api.ts b/frontend/src/types/api.ts
new file mode 100644
index 0000000..fe375c6
--- /dev/null
+++ b/frontend/src/types/api.ts
@@ -0,0 +1,7 @@
+// REST request/response envelopes (non-admin).
+
+// Setup status from GET /api/setup/status
+export interface SetupStatus {
+  needsSetup: boolean;
+  publicAccess: boolean;
+}
diff --git a/frontend/src/types/auth.ts b/frontend/src/types/auth.ts
new file mode 100644
index 0000000..6a40dbf
--- /dev/null
+++ b/frontend/src/types/auth.ts
@@ -0,0 +1,25 @@
+// Authentication request/response shapes.
+
+export interface LoginResponse {
+  token: string;
+  user: {
+    id: number;
+    username: string;
+    role: string;
+  };
+  passwordNeedChange: boolean;
+}
+
+export interface RefreshResponse {
+  token: string;
+  user: {
+    id: number;
+    username: string;
+    role: string;
+  };
+}
+
+export interface ChangePasswordRequest {
+  currentPassword: string;
+  newPassword: string;
+}
diff --git a/frontend/src/types/call.ts b/frontend/src/types/call.ts
new file mode 100644
index 0000000..09a8ed3
--- /dev/null
+++ b/frontend/src/types/call.ts
@@ -0,0 +1,40 @@
+// Call data from WS CAL event or search results.
+
+export interface Call {
+  id: number;
+  audioName: string;
+  audioType: string;
+  dateTime: number; // unix timestamp
+  systemId: number; // radio system ID
+  system: number; // DB system ID
+  talkgroupId: number; // radio TG ID
+  talkgroup: number; // DB TG ID
+  frequency?: number; // Hz
+  duration?: number; // ms
+  source?: number; // unit ID
+  sources?: string; // JSON array
+  frequencies?: string; // JSON array
+  patches?: string; // JSON array
+  site?: string; // receiver site name
+  channel?: string; // channel identifier
+  decoder?: string; // decoder type (e.g. "P25 Phase 1")
+  errorCount?: number; // P25 error count
+  spikeCount?: number; // P25 spike count
+  talkerAlias?: string; // DMR/P25 talker alias
+  systemLabel?: string; // populated from config
+  talkgroupLabel?: string; // populated from config
+  talkgroupName?: string; // populated from config
+  talkgroupTag?: string; // populated from config
+  talkgroupGroup?: string; // populated from config
+  talkgroupLedColor?: string; // CSS color for LED
+  transcript?: string;
+  transcriptSegments?: TranscriptionSegment[];
+  audioUrl?: string; // object URL for audio playback
+}
+
+export interface TranscriptionSegment {
+  speaker?: string;
+  start: number;
+  end: number;
+  text: string;
+}
diff --git a/frontend/src/types/config.ts b/frontend/src/types/config.ts
new file mode 100644
index 0000000..ec22c21
--- /dev/null
+++ b/frontend/src/types/config.ts
@@ -0,0 +1,34 @@
+// Scanner / system / talkgroup configuration delivered via WS CFG/VER events.
+
+export interface SystemConfig {
+  id: number;
+  systemId: number;
+  label: string;
+  ledColor: string;
+  talkgroups: TalkgroupConfig[];
+}
+
+export interface TalkgroupConfig {
+  id: number;
+  talkgroupId: number;
+  label: string;
+  name: string;
+  tag: string;
+  group: string;
+  ledColor: string; // CSS color string
+  frequency?: number;
+}
+
+export interface ScannerConfig {
+  systems: SystemConfig[];
+  branding?: string;
+  email?: string;
+  version?: string;
+  time12hFormat: boolean;
+  showListenersCount: boolean;
+  playbackGoesLive: boolean;
+  shareableLinks: boolean;
+  keypadBeeps: string;
+  transcriptionEnabled: boolean;
+  liveTranscriptDisplay: boolean;
+}
diff --git a/frontend/src/types/index.ts b/frontend/src/types/index.ts
index d518b33..d04aedc 100644
--- a/frontend/src/types/index.ts
+++ b/frontend/src/types/index.ts
@@ -1,413 +1,10 @@
-// Call data from WS CAL event or search results
-export interface Call {
-  id: number;
-  audioName: string;
-  audioType: string;
-  dateTime: number; // unix timestamp
-  systemId: number; // radio system ID
-  system: number; // DB system ID
-  talkgroupId: number; // radio TG ID
-  talkgroup: number; // DB TG ID
-  frequency?: number; // Hz
-  duration?: number; // ms
-  source?: number; // unit ID
-  sources?: string; // JSON array
-  frequencies?: string; // JSON array
-  patches?: string; // JSON array
-  site?: string; // receiver site name
-  channel?: string; // channel identifier
-  decoder?: string; // decoder type (e.g. "P25 Phase 1")
-  errorCount?: number; // P25 error count
-  spikeCount?: number; // P25 spike count
-  talkerAlias?: string; // DMR/P25 talker alias
-  systemLabel?: string; // populated from config
-  talkgroupLabel?: string; // populated from config
-  talkgroupName?: string; // populated from config
-  talkgroupTag?: string; // populated from config
-  talkgroupGroup?: string; // populated from config
-  talkgroupLedColor?: string; // CSS color for LED
-  transcript?: string;
-  transcriptSegments?: TranscriptionSegment[];
-  audioUrl?: string; // object URL for audio playback
-}
-
-export interface TranscriptionSegment {
-  speaker?: string;
-  start: number;
-  end: number;
-  text: string;
-}
-
-// System/talkgroup config from CFG event
-export interface SystemConfig {
-  id: number;
-  systemId: number;
-  label: string;
-  ledColor: string;
-  talkgroups: TalkgroupConfig[];
-}
-
-export interface TalkgroupConfig {
-  id: number;
-  talkgroupId: number;
-  label: string;
-  name: string;
-  tag: string;
-  group: string;
-  ledColor: string; // CSS color string
-  frequency?: number;
-}
-
-// Scanner configuration from CFG/VER events
-export interface ScannerConfig {
-  systems: SystemConfig[];
-  branding?: string;
-  email?: string;
-  version?: string;
-  time12hFormat: boolean;
-  showListenersCount: boolean;
-  playbackGoesLive: boolean;
-  shareableLinks: boolean;
-  keypadBeeps: string;
-  transcriptionEnabled: boolean;
-  liveTranscriptDisplay: boolean;
-}
-
-// WS message: JSON array [command, payload?, flags?]
-export type WsCommand =
-  | "CAL"
-  | "CFG"
-  | "XPR"
-  | "LCL"
-  | "LSC"
-  | "LFM"
-  | "MAX"
-  | "VER"
-  | "TRN"
-  | "ADM_EVT"
-  | "ADM_REQ"
-  | "ADM_RES";
-
-// Setup status from GET /api/setup/status
-export interface SetupStatus {
-  needsSetup: boolean;
-  publicAccess: boolean;
-}
-
-// Auth login response
-export interface LoginResponse {
-  token: string;
-  user: {
-    id: number;
-    username: string;
-    role: string;
-  };
-  passwordNeedChange: boolean;
-}
-
-// Auth refresh response
-export interface RefreshResponse {
-  token: string;
-  user: {
-    id: number;
-    username: string;
-    role: string;
-  };
-}
-
-// For avoid timer tracking
-export interface AvoidEntry {
-  talkgroupId: number;
-  expiresAt: number; // unix ms timestamp, 0 = permanent
-}
-
-// Connection status for WS
-export type ConnectionStatus = "connecting" | "connected" | "disconnected";
-
-// ─── Admin resource types ───
-
-export interface AdminUser {
-  id: number;
-  username: string;
-  role: "admin" | "listener";
-  disabled: number; // 0 or 1
-  systemsJson: string | null;
-  expiration: number | null; // unix timestamp
-  limit: number | null; // concurrent connection limit
-  createdAt: number;
-  updatedAt: number;
-}
-
-export interface AdminSystem {
-  id: number;
-  systemId: number;
-  label: string;
-  autoPopulateTalkgroups: number;
-  blacklistsJson: string | null;
-  led: string | null;
-  order: number;
-}
-
-export interface AdminTalkgroup {
-  id: number;
-  systemId: number;
-  talkgroupId: number;
-  label: string | null;
-  name: string | null;
-  frequency: number | null;
-  led: string | null;
-  groupId: number | null;
-  tagId: number | null;
-  order: number;
-}
-
-export interface AdminUnit {
-  id: number;
-  systemId: number;
-  unitId: number;
-  label: string | null;
-  order: number;
-}
-
-export interface AdminGroup {
-  id: number;
-  label: string;
-}
-
-export interface AdminTag {
-  id: number;
-  label: string;
-}
-
-export interface AdminApiKey {
-  id: number;
-  fingerprint: string;
-  ident: string | null;
-  disabled: number;
-  systemsJson: string | null;
-  callRateLimit: number | null;
-  order: number;
-}
-
-export interface AdminApiKeyCreateResponse extends AdminApiKey {
-  createdKey: string;
-}
-
-export interface AdminDownstream {
-  id: number;
-  url: string;
-  hasApiKey: boolean;
-  systemsJson: string | null;
-  disabled: number;
-  order: number;
-}
-
-export interface AdminDownstreamCreate {
-  url: string;
-  apiKey: string;
-  systemsJson: string | null;
-  disabled: number;
-  order: number;
-}
-
-export interface AdminDownstreamUpdate {
-  id: number;
-  url: string;
-  apiKey: string;
-  systemsJson: string | null;
-  disabled: number;
-  order: number;
-}
-
-export interface AdminWebhook {
-  id: number;
-  url: string;
-  type: string;
-  secret: string | null;
-  systemsJson: string | null;
-  disabled: number;
-  order: number;
-}
-
-export interface AdminSetting {
-  key: string;
-  value: string;
-}
-
-export interface Capabilities {
-  ffmpeg: boolean;
-  fdkAac: boolean;
-  whisper: boolean;
-}
-
-export interface ConfigResponse {
-  settings: AdminSetting[];
-  capabilities: Capabilities;
-}
-
-export interface AdminLog {
-  dateTime: number;
-  level: string;
-  message: string;
-  attrs?: Record<string, string>;
-}
-
-// Password change request
-export interface ChangePasswordRequest {
-  currentPassword: string;
-  newPassword: string;
-}
-
-// User create/update payload
-export interface CreateUserPayload {
-  username: string;
-  password: string;
-  role: "admin" | "listener";
-  disabled?: number;
-  systemsJson?: string | null;
-  expiration?: number | null;
-  limit?: number | null;
-}
-
-export interface UpdateUserPayload {
-  username?: string;
-  password?: string;
-  role?: "admin" | "listener";
-  disabled?: number;
-  systemsJson?: string | null;
-  expiration?: number | null;
-  limit?: number | null;
-}
-
-export interface AdminDirMonitor {
-  id: number;
-  directory: string;
-  type: string;
-  mask: string | null;
-  extension: string | null;
-  frequency: number | null;
-  delay: number | null;
-  deleteAfter: number;
-  usePolling: number;
-  disabled: number;
-  systemId: number | null;
-  talkgroupId: number | null;
-  order: number;
-}
-
-// --- RadioReference enrichment types ---
-
-export interface RRTalkgroupCandidate {
-  row: number;
-  talkgroupId: number;
-  label?: string;
-  name?: string;
-  group?: string;
-  tag?: string;
-  led?: string;
-  order?: number;
-}
-
-export interface RRPreviewRow extends RRTalkgroupCandidate {
-  matched: boolean;
-  wouldUpdate: boolean;
-  wouldUpdateFields: string[];
-  skipReason?: string;
-}
-
-export interface RRRowError {
-  row: number;
-  reason: string;
-}
-
-export interface RRPreviewResponse {
-  processed: number;
-  matched: number;
-  wouldUpdate: number;
-  skipped: number;
-  errors: number;
-  rowErrors: RRRowError[];
-  rows: RRPreviewRow[];
-}
-
-export interface RRApplyRequest {
-  systemId: number;
-  candidates: RRTalkgroupCandidate[];
-  mergeMode: string;
-  selectedFields: string[];
-}
-
-export interface RRApplyResponse {
-  processed: number;
-  matched: number;
-  updated: number;
-  skipped: number;
-  errors: number;
-  rowErrors: RRRowError[];
-}
-
-// --- Shared Links (admin) ---
-
-export interface SharedLinkAdmin {
-  id: number;
-  callId: number;
-  token: string;
-  createdAt: number;
-  sharedBy: string;
-  dateTime: number;
-  duration: number;
-  systemLabel: string;
-  talkgroupLabel: string;
-  talkgroupName: string;
-  expiresAt: number | null;
-}
-
-// --- Server filesystem types ---
-
-export interface ServerDirectoryEntry {
-  name: string;
-  path: string;
-}
-
-export interface ServerDirectoryListResponse {
-  path: string;
-  parent: string | null;
-  directories: ServerDirectoryEntry[];
-}
-
-// --- Transcription types ---
-
-export interface TranscriptionStatus {
-  enabled: boolean;
-  url: string;
-  model: string;
-  language: string;
-  diarize: boolean;
-  liveDisplay: boolean;
-  connected: boolean;
-}
-
-export interface WhisperModel {
-  id: string;
-  object: string;
-  path: string;
-  created: number;
-  owned_by: string;
-}
-
-export interface TranscriptionModelsResponse {
-  object: string;
-  models: WhisperModel[];
-}
-
-export interface TranscriptionStats {
-  total: number;
-  recent24h: number;
-  avgDurationMs: number;
-  minDurationMs: number;
-  maxDurationMs: number;
-  queueDepth: number;
-  poolEnabled: boolean;
-  byLanguage: { language: string; count: number }[];
-  byModel: { model: string; count: number }[];
-}
+// Barrel re-export for the types tree. Existing `@/types` imports keep
+// working; new code can also import from a specific module
+// (`@/types/call`, `@/types/admin`, etc.).
+export * from "./admin";
+export * from "./api";
+export * from "./auth";
+export * from "./call";
+export * from "./config";
+export * from "./ui";
+export * from "./ws";
diff --git a/frontend/src/types/ui.ts b/frontend/src/types/ui.ts
new file mode 100644
index 0000000..b68bbd4
--- /dev/null
+++ b/frontend/src/types/ui.ts
@@ -0,0 +1,7 @@
+// Purely client-side view-state types.
+
+// Avoid timer tracking
+export interface AvoidEntry {
+  talkgroupId: number;
+  expiresAt: number; // unix ms timestamp, 0 = permanent
+}
diff --git a/frontend/src/types/ws.ts b/frontend/src/types/ws.ts
new file mode 100644
index 0000000..95ce172
--- /dev/null
+++ b/frontend/src/types/ws.ts
@@ -0,0 +1,19 @@
+// WS framing types.
+
+// WS message: JSON array [command, payload?, flags?]
+export type WsCommand =
+  | "CAL"
+  | "CFG"
+  | "XPR"
+  | "LCL"
+  | "LSC"
+  | "LFM"
+  | "MAX"
+  | "VER"
+  | "TRN"
+  | "ADM_EVT"
+  | "ADM_REQ"
+  | "ADM_RES";
+
+// Connection status for WS
+export type ConnectionStatus = "connecting" | "connected" | "disconnected";