diff --git a/src/backend/common/infrastructure/Atomic.ts b/src/backend/common/infrastructure/Atomic.ts
index 5f4aa35c..e0f4d9a7 100644
--- a/src/backend/common/infrastructure/Atomic.ts
+++ b/src/backend/common/infrastructure/Atomic.ts
@@ -109,12 +109,6 @@ export type GroupedPlays = TupleMap<DeviceId,PlayUserId,ProgressAwarePlayObject[
 
 export type GroupedFixedPlays = TupleMap<DeviceId,PlayUserId,FixedSizeList<ProgressAwarePlayObject>>;
 
-export const NO_DEVICE = 'NoDevice';
-export const NO_USER = 'SingleUser';
-
-export const SINGLE_USER_PLATFORM_ID: PlayPlatformId = [NO_DEVICE, NO_USER];
-export const SINGLE_USER_PLATFORM_ID_STR = `${NO_DEVICE}-${NO_USER}`;
-
 export interface ScrobbledPlayObject {
     play: PlayObject
     scrobble: PlayObjectMinimal
diff --git a/src/backend/scrobblers/DiscordScrobbler.ts b/src/backend/scrobblers/DiscordScrobbler.ts
index 28ed2706..9bb1cbc5 100644
--- a/src/backend/scrobblers/DiscordScrobbler.ts
+++ b/src/backend/scrobblers/DiscordScrobbler.ts
@@ -1,7 +1,8 @@
 import type {Logger, LogLevel} from "@foxxmd/logging";
 import type EventEmitter from "events";
 import type {PlayMatchResult, PlayObject, SourcePlayerObj} from "../../core/Atomic.ts";
-import { type FormatPlayObjectOptions, SINGLE_USER_PLATFORM_ID_STR } from "../common/infrastructure/Atomic.ts";
+import { type FormatPlayObjectOptions } from "../common/infrastructure/Atomic.ts";
+import { SINGLE_USER_PLATFORM_ID_STR } from '../../core/Atomic.ts';
 import { CALCULATED_PLAYER_STATUSES } from '../../core/Atomic.ts';
 import { REPORTED_PLAYER_STATUSES } from '../../core/Atomic.ts';
 
diff --git a/src/backend/sources/AzuracastSource.ts b/src/backend/sources/AzuracastSource.ts
index 607ba933..f3a6a297 100644
--- a/src/backend/sources/AzuracastSource.ts
+++ b/src/backend/sources/AzuracastSource.ts
@@ -10,8 +10,8 @@ import {
     type FormatPlayObjectOptions,
     type InternalConfig,
     type PlayerStateData,
-    SINGLE_USER_PLATFORM_ID,
 } from "../common/infrastructure/Atomic.ts";
+import { SINGLE_USER_PLATFORM_ID } from '../../core/Atomic.ts';
 import { REPORTED_PLAYER_STATUSES } from '../../core/Atomic.ts';
 import type {AzuracastSourceConfig, AzuraNowPlayingResponse, AzuraStationResponse} from "../common/infrastructure/config/source/azuracast.ts";
 import { isPortReachable, normalizeWSAddress } from "../utils/NetworkUtils.ts";
diff --git a/src/backend/sources/ChromecastSource.ts b/src/backend/sources/ChromecastSource.ts
index 341a5ee9..2b796897 100644
--- a/src/backend/sources/ChromecastSource.ts
+++ b/src/backend/sources/ChromecastSource.ts
@@ -13,10 +13,10 @@ import {
     type FormatPlayObjectOptions,
     type InternalConfig,
     type MdnsDeviceInfo,
-    NO_USER,
     type PlayerStateData,
     type SourceData,
 } from "../common/infrastructure/Atomic.ts";
+import { NO_USER } from '../../core/Atomic.ts';
 import type {ChromecastSourceConfig} from "../common/infrastructure/config/source/chromecast.ts";
 import { MaybeLogger } from '../common/MaybeLogger.ts';
 import {
diff --git a/src/backend/sources/EndpointLastfmSource.ts b/src/backend/sources/EndpointLastfmSource.ts
index da0dfecd..0c8b6242 100644
--- a/src/backend/sources/EndpointLastfmSource.ts
+++ b/src/backend/sources/EndpointLastfmSource.ts
@@ -5,8 +5,8 @@ import {
     type ExpressRequest,
     type FormatPlayObjectOptions,
     type InternalConfig,
-    NO_USER,
     type PlayerStateData} from "../common/infrastructure/Atomic.ts";
+import { NO_USER } from '../../core/Atomic.ts';
 import { REPORTED_PLAYER_STATUSES } from '../../core/Atomic.ts';
 import type {PlayPlatformId} from '../../core/Atomic.ts';
 import MemorySource from "./MemorySource.ts";
diff --git a/src/backend/sources/EndpointListenbrainzSource.ts b/src/backend/sources/EndpointListenbrainzSource.ts
index a6d01f22..44a22c5f 100644
--- a/src/backend/sources/EndpointListenbrainzSource.ts
+++ b/src/backend/sources/EndpointListenbrainzSource.ts
@@ -5,8 +5,8 @@ import {
     type ExpressRequest,
     type FormatPlayObjectOptions,
     type InternalConfig,
-    NO_USER,
     type PlayerStateData} from "../common/infrastructure/Atomic.ts";
+import { NO_USER } from '../../core/Atomic.ts';
 import { REPORTED_PLAYER_STATUSES } from '../../core/Atomic.ts';
 import type {ReportedPlayerStatus} from '../../core/Atomic.ts';
 import type {PlayPlatformId} from '../../core/Atomic.ts';
diff --git a/src/backend/sources/IcecastSource.ts b/src/backend/sources/IcecastSource.ts
index 7b78e35a..6e944deb 100644
--- a/src/backend/sources/IcecastSource.ts
+++ b/src/backend/sources/IcecastSource.ts
@@ -5,8 +5,8 @@ import {
     type FormatPlayObjectOptions,
     type InternalConfig,
     type PlayerStateData,
-    SINGLE_USER_PLATFORM_ID,
 } from "../common/infrastructure/Atomic.ts";
+import { SINGLE_USER_PLATFORM_ID } from '../../core/Atomic.ts';
 import { REPORTED_PLAYER_STATUSES } from '../../core/Atomic.ts';
 import { isPortReachableConnect, normalizeWebAddress } from "../utils/NetworkUtils.ts";
 import MemorySource from "./MemorySource.ts";
diff --git a/src/backend/sources/MPDSource.ts b/src/backend/sources/MPDSource.ts
index 2a4c6da9..f6c49794 100644
--- a/src/backend/sources/MPDSource.ts
+++ b/src/backend/sources/MPDSource.ts
@@ -7,8 +7,8 @@ import {
     type FormatPlayObjectOptions,
     type InternalConfig,
     type PlayerStateData,
-    SINGLE_USER_PLATFORM_ID,
 } from "../common/infrastructure/Atomic.ts";
+import { SINGLE_USER_PLATFORM_ID } from '../../core/Atomic.ts';
 import { REPORTED_PLAYER_STATUSES } from '../../core/Atomic.ts';
 import type {ReportedPlayerStatus} from '../../core/Atomic.ts';
 import type {MPDSourceConfig, PlayerState} from "../common/infrastructure/config/source/mpd.ts";
diff --git a/src/backend/sources/MopidySource.ts b/src/backend/sources/MopidySource.ts
index d78c5507..f584437d 100644
--- a/src/backend/sources/MopidySource.ts
+++ b/src/backend/sources/MopidySource.ts
@@ -11,8 +11,8 @@ import {
     type FormatPlayObjectOptions,
     type InternalConfig,
     type PlayerStateData,
-    SINGLE_USER_PLATFORM_ID,
 } from "../common/infrastructure/Atomic.ts";
+import { SINGLE_USER_PLATFORM_ID } from '../../core/Atomic.ts';
 import type {MopidySourceConfig} from "../common/infrastructure/config/source/mopidy.ts";
 import type {RecentlyPlayedOptions} from "./AbstractSource.ts";
 import { MemoryPositionalSource } from "./MemoryPositionalSource.ts";
diff --git a/src/backend/sources/MusicCastSource.ts b/src/backend/sources/MusicCastSource.ts
index c631a811..df1d3035 100644
--- a/src/backend/sources/MusicCastSource.ts
+++ b/src/backend/sources/MusicCastSource.ts
@@ -6,8 +6,8 @@ import {
     type FormatPlayObjectOptions,
     type InternalConfig,
     type PlayerStateData,
-    SINGLE_USER_PLATFORM_ID,
 } from "../common/infrastructure/Atomic.ts";
+import { SINGLE_USER_PLATFORM_ID } from '../../core/Atomic.ts';
 import { isPortReachableConnect, joinedUrl, normalizeWebAddress } from "../utils/NetworkUtils.ts";
 import { type DeviceInfoResponse, type DeviceStatusResponse, MusicCastResponseCodes, type MusicCastSourceConfig, playbackToReportedStatus, type PlayInfoCDResponse, type PlayInfoNetResponse } from "../common/infrastructure/config/source/musiccast.ts";
 import request from 'superagent';
diff --git a/src/backend/sources/MusikcubeSource.ts b/src/backend/sources/MusikcubeSource.ts
index 320756c1..3ff8cb22 100644
--- a/src/backend/sources/MusikcubeSource.ts
+++ b/src/backend/sources/MusikcubeSource.ts
@@ -10,8 +10,8 @@ import {
     type FormatPlayObjectOptions,
     type InternalConfig,
     type PlayerStateData,
-    SINGLE_USER_PLATFORM_ID,
 } from "../common/infrastructure/Atomic.ts";
+import { SINGLE_USER_PLATFORM_ID } from '../../core/Atomic.ts';
 import type {MCAuthenticateRequest, MCAuthenticateResponse, MCPlaybackOverviewRequest, MCPlaybackOverviewResponse, MusikcubeSourceConfig} from "../common/infrastructure/config/source/musikcube.ts";
 import { sleep } from "../utils.ts";
 import type {RecentlyPlayedOptions} from "./AbstractSource.ts";
diff --git a/src/backend/sources/SonosSource.ts b/src/backend/sources/SonosSource.ts
index 5dab7d81..09cac3ae 100644
--- a/src/backend/sources/SonosSource.ts
+++ b/src/backend/sources/SonosSource.ts
@@ -3,10 +3,10 @@ import type {PlayObject, PlayObjectMinimal} from "../../core/Atomic.ts";
 import {
     type FormatPlayObjectOptions,
     type InternalConfig,
-    NO_DEVICE,
-    NO_USER,
     type PlayerStateData,
 } from "../common/infrastructure/Atomic.ts";
+import { NO_USER } from '../../core/Atomic.ts';
+import { NO_DEVICE } from '../../core/Atomic.ts';
 import { REPORTED_PLAYER_STATUSES } from '../../core/Atomic.ts';
 import type {ReportedPlayerStatus} from '../../core/Atomic.ts';
 import type {RecentlyPlayedOptions} from "./AbstractSource.ts";
diff --git a/src/backend/sources/SpotifySource.ts b/src/backend/sources/SpotifySource.ts
index 018d38a9..dd06f197 100644
--- a/src/backend/sources/SpotifySource.ts
+++ b/src/backend/sources/SpotifySource.ts
@@ -10,8 +10,6 @@ import {
     DEFAULT_POLLING_INTERVAL,
     type FormatPlayObjectOptions,
     type InternalConfig,
-    NO_DEVICE,
-    NO_USER,
     type PaginatedListensTimeRangeOptions,
     type PaginatedTimeRangeListens,
     type PaginatedTimeRangeListensResult,
@@ -19,6 +17,8 @@ import {
     type SourceData,
     type TimeRangeListensFetcher,
 } from "../common/infrastructure/Atomic.ts";
+import { NO_USER } from '../../core/Atomic.ts';
+import { NO_DEVICE } from '../../core/Atomic.ts';
 import type {ReportedPlayerStatus} from '../../core/Atomic.ts';
 import type {SpotifySourceConfig} from "../common/infrastructure/config/source/spotify.ts";
 import {
diff --git a/src/backend/sources/SubsonicSource.ts b/src/backend/sources/SubsonicSource.ts
index 9ae5cb86..6f199fec 100644
--- a/src/backend/sources/SubsonicSource.ts
+++ b/src/backend/sources/SubsonicSource.ts
@@ -22,6 +22,7 @@ import { baseFormatPlayObj } from '../utils/PlayTransformUtils.ts';
 import { noRetryOnUpstreamError, tryApiCall } from '../utils/RequestUtils.ts';
 import { artistNameToCredit } from '../../core/StringUtils.ts';
 import { timeToHumanTimestamp, todayAwareFormat } from '../../core/TimeUtils.ts';
+import type { ComponentSourceApiJson, SubsonicSourceApiJson } from '../../core/Api.ts';
 
 dayjs.extend(isSameOrAfter);
 
@@ -373,6 +374,13 @@ export class SubsonicSource extends MemoryPositionalSource {
     }
 
     getNewPlayer = (logger: Logger, id: PlayPlatformId, opts: PlayerStateOptions) => new SubsonicPlayerState(logger, id, opts);
+
+    public getApiData(): SubsonicSourceApiJson {
+        return {
+            ...super.getApiData(),
+            playbackReporting: this.playbackReportSupported
+        }
+    }
 }
 
 const subsonicPlaybackStateToReportedStatus = (state: string | undefined) => {
diff --git a/src/backend/sources/VLCSource.ts b/src/backend/sources/VLCSource.ts
index cebc811a..72a35de1 100644
--- a/src/backend/sources/VLCSource.ts
+++ b/src/backend/sources/VLCSource.ts
@@ -7,8 +7,8 @@ import {
     type FormatPlayObjectOptions,
     type InternalConfig,
     type PlayerStateData,
-    SINGLE_USER_PLATFORM_ID,
 } from "../common/infrastructure/Atomic.ts";
+import { SINGLE_USER_PLATFORM_ID } from '../../core/Atomic.ts';
 import { REPORTED_PLAYER_STATUSES } from '../../core/Atomic.ts';
 import type {ReportedPlayerStatus} from '../../core/Atomic.ts';
 import type {VlcAudioMeta, VLCSourceConfig, PlayerState} from "../common/infrastructure/config/source/vlc.ts";
diff --git a/src/backend/sources/WebScrobblerSource.ts b/src/backend/sources/WebScrobblerSource.ts
index c4754837..7f708174 100644
--- a/src/backend/sources/WebScrobblerSource.ts
+++ b/src/backend/sources/WebScrobblerSource.ts
@@ -4,9 +4,9 @@ import { type PlayObjectMinimal, SOURCE_SOT } from "../../core/Atomic.ts";
 import {
     type FormatPlayObjectOptions,
     type InternalConfig,
-    NO_USER,
     type PlayerStateData,
 } from "../common/infrastructure/Atomic.ts";
+import { NO_USER } from '../../core/Atomic.ts';
 import { REPORTED_PLAYER_STATUSES } from '../../core/Atomic.ts';
 import type {ReportedPlayerStatus} from '../../core/Atomic.ts';
 import type {PlayPlatformId} from '../../core/Atomic.ts';
diff --git a/src/backend/sources/YandexMusicBridgeSource.ts b/src/backend/sources/YandexMusicBridgeSource.ts
index c269c608..124a6e7a 100644
--- a/src/backend/sources/YandexMusicBridgeSource.ts
+++ b/src/backend/sources/YandexMusicBridgeSource.ts
@@ -5,10 +5,10 @@ import type {RecentlyPlayedOptions} from "./AbstractSource.ts";
 import type {PlayObject, PlayObjectMinimal, URLData} from "../../core/Atomic.ts";
 import {
     type InternalConfig,
-    NO_DEVICE,
-    NO_USER,
     type PlayerStateDataMaybePlay,
 } from "../common/infrastructure/Atomic.ts";
+import { NO_USER } from '../../core/Atomic.ts';
+import { NO_DEVICE } from '../../core/Atomic.ts';
 import { REPORTED_PLAYER_STATUSES } from '../../core/Atomic.ts';
 import type {YandexMusicBridgeSourceConfig} from "../common/infrastructure/config/source/ymbridge.ts";
 import { isPortReachableConnect, joinedUrl, normalizeWebAddress } from "../utils/NetworkUtils.ts";
diff --git a/src/backend/tests/player/player.test.ts b/src/backend/tests/player/player.test.ts
index d0ea10dd..8f8d5ef8 100644
--- a/src/backend/tests/player/player.test.ts
+++ b/src/backend/tests/player/player.test.ts
@@ -4,11 +4,10 @@ import clone from "clone";
 import dayjs, { type Dayjs } from "dayjs";
 import { describe, it } from 'mocha';
 import {
-    NO_DEVICE,
-    NO_USER,
-    type PlayerStateDataMaybePlay,
-    SINGLE_USER_PLATFORM_ID
-} from "../../common/infrastructure/Atomic.ts";
+    type PlayerStateDataMaybePlay} from "../../common/infrastructure/Atomic.ts";
+import { SINGLE_USER_PLATFORM_ID } from '../../../core/Atomic.ts';
+import { NO_USER } from '../../../core/Atomic.ts';
+import { NO_DEVICE } from '../../../core/Atomic.ts';
 import { CALCULATED_PLAYER_STATUSES } from '../../../core/Atomic.ts';
 import { REPORTED_PLAYER_STATUSES } from '../../../core/Atomic.ts';
 import { GenericPlayerState } from "../../sources/PlayerState/GenericPlayerState.ts";
diff --git a/src/backend/utils.ts b/src/backend/utils.ts
index a4a46b29..49a381b7 100644
--- a/src/backend/utils.ts
+++ b/src/backend/utils.ts
@@ -9,13 +9,13 @@ import { TimeoutError, WebapiError } from "spotify-web-api-node/src/response-err
 import { DEFAULT_MISSING_MBIDS_TYPES, type MissingMbidType, type PlayObject } from "../core/Atomic.ts";
 import {
     asPlayerStateDataMaybePlay,
-    NO_DEVICE,
-    NO_USER,
     type PlayerStateDataMaybePlay,
     type ProgressAwarePlayObject,
     type RemoteIdentityParts,
     type ScrobbleThresholdResult,
 } from "./common/infrastructure/Atomic.ts";
+import { NO_USER } from '../core/Atomic.ts';
+import { NO_DEVICE } from '../core/Atomic.ts';
 import type {PlayPlatformId} from '../core/Atomic.ts';
 import { genGroupIdStr } from '../core/PlayUtils.ts';
 import { durationToNormalizedTime } from '../core/TimeUtils.ts';
diff --git a/src/core/Atomic.ts b/src/core/Atomic.ts
index 5bb9508e..b8c9e3c6 100644
--- a/src/core/Atomic.ts
+++ b/src/core/Atomic.ts
@@ -802,3 +802,7 @@ export interface MonitoringStatus {
     monitoring: boolean
     origin: MonitoringOrigin
 }
+export const NO_DEVICE = 'NoDevice';export const NO_USER = 'SingleUser';
+export const SINGLE_USER_PLATFORM_ID: PlayPlatformId = [NO_DEVICE, NO_USER];
+export const SINGLE_USER_PLATFORM_ID_STR = `${NO_DEVICE}-${NO_USER}`;
+
diff --git a/src/core/tests/utils/PlayTestUtils.ts b/src/core/tests/utils/PlayTestUtils.ts
index c04a2cb5..e0f8cc3f 100644
--- a/src/core/tests/utils/PlayTestUtils.ts
+++ b/src/core/tests/utils/PlayTestUtils.ts
@@ -8,7 +8,10 @@ import utc from "dayjs/plugin/utc.js";
 import { type ArtistCredit, type BrainzMeta, FEAT, JOINERS, JOINERS_FINAL, type JsonPlayObject, type MBID, type ObjectPlayData, type PlayMeta, type PlayObject, type SourcePlayerObj } from "../../Atomic.ts";
 import { genGroupIdStr } from '../../PlayUtils.ts';
 import { sortByNewestPlayDate } from '../../PlayUtils.ts';
-import { NO_DEVICE, NO_USER, type PlayerStateDataMaybePlay, SINGLE_USER_PLATFORM_ID } from '../../../backend/common/infrastructure/Atomic.ts';
+import type { PlayerStateDataMaybePlay } from '../../../backend/common/infrastructure/Atomic.ts';
+import { SINGLE_USER_PLATFORM_ID } from '../../Atomic.ts';
+import { NO_USER } from '../../Atomic.ts';
+import { NO_DEVICE } from '../../Atomic.ts';
 import { CALCULATED_PLAYER_STATUSES } from '../../Atomic.ts';
 import { REPORTED_PLAYER_STATUSES } from '../../Atomic.ts';
 import type {PlayPlatformId} from '../../Atomic.ts';