diff --git a/android/CHANGELOG.md b/android/CHANGELOG.md
index 07dd92f..70977dc 100644
--- a/android/CHANGELOG.md
+++ b/android/CHANGELOG.md
@@ -301,3 +301,9 @@
 - Added muted-chat guard in realtime notification flow: muted chats stay silent unless message is a mention.
 - Routed mention notifications to mentions channel/priority via `NotificationDispatcher`.
 - Added parser unit test for mention-flag mapping.
+
+### Step 50 - Notification settings storage (DataStore)
+- Added domain notification settings models/repository contracts (global + per-chat override).
+- Added `DataStoreNotificationSettingsRepository` with persistence for global flags and per-chat override mode.
+- Added `ShouldShowMessageNotificationUseCase` and wired realtime notifications through it.
+- Added unit tests for DataStore notification settings repository and notification visibility use case.
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/data/notifications/repository/DataStoreNotificationSettingsRepository.kt b/android/app/src/main/java/ru/daemonlord/messenger/data/notifications/repository/DataStoreNotificationSettingsRepository.kt
new file mode 100644
index 0000000..1b7b1ae
--- /dev/null
+++ b/android/app/src/main/java/ru/daemonlord/messenger/data/notifications/repository/DataStoreNotificationSettingsRepository.kt
@@ -0,0 +1,82 @@
+package ru.daemonlord.messenger.data.notifications.repository
+
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.core.booleanPreferencesKey
+import androidx.datastore.preferences.core.edit
+import androidx.datastore.preferences.core.stringPreferencesKey
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.flow.map
+import ru.daemonlord.messenger.domain.notifications.model.ChatNotificationOverride
+import ru.daemonlord.messenger.domain.notifications.model.NotificationSettings
+import ru.daemonlord.messenger.domain.notifications.repository.NotificationSettingsRepository
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+class DataStoreNotificationSettingsRepository @Inject constructor(
+    private val dataStore: DataStore<Preferences>,
+) : NotificationSettingsRepository {
+
+    override fun observeSettings(): Flow<NotificationSettings> {
+        return dataStore.data.map { preferences ->
+            NotificationSettings(
+                globalEnabled = preferences[GLOBAL_ENABLED_KEY] ?: true,
+                previewEnabled = preferences[PREVIEW_ENABLED_KEY] ?: true,
+            )
+        }
+    }
+
+    override suspend fun getSettings(): NotificationSettings {
+        return observeSettings().first()
+    }
+
+    override suspend fun setGlobalEnabled(enabled: Boolean) {
+        dataStore.edit { preferences ->
+            preferences[GLOBAL_ENABLED_KEY] = enabled
+        }
+    }
+
+    override suspend fun setPreviewEnabled(enabled: Boolean) {
+        dataStore.edit { preferences ->
+            preferences[PREVIEW_ENABLED_KEY] = enabled
+        }
+    }
+
+    override fun observeChatOverride(chatId: Long): Flow<ChatNotificationOverride> {
+        return dataStore.data.map { preferences ->
+            preferences.chatOverride(chatId)
+        }
+    }
+
+    override suspend fun getChatOverride(chatId: Long): ChatNotificationOverride {
+        return observeChatOverride(chatId).first()
+    }
+
+    override suspend fun setChatOverride(chatId: Long, mode: ChatNotificationOverride) {
+        dataStore.edit { preferences ->
+            preferences[chatOverrideKey(chatId)] = mode.name
+        }
+    }
+
+    override suspend fun clearChatOverride(chatId: Long) {
+        dataStore.edit { preferences ->
+            preferences.remove(chatOverrideKey(chatId))
+        }
+    }
+
+    private fun Preferences.chatOverride(chatId: Long): ChatNotificationOverride {
+        return this[chatOverrideKey(chatId)]
+            ?.let { runCatching { ChatNotificationOverride.valueOf(it) }.getOrNull() }
+            ?: ChatNotificationOverride.DEFAULT
+    }
+
+    private fun chatOverrideKey(chatId: Long) = stringPreferencesKey("notification_chat_override_$chatId")
+
+    private companion object {
+        val GLOBAL_ENABLED_KEY = booleanPreferencesKey("notification_global_enabled")
+        val PREVIEW_ENABLED_KEY = booleanPreferencesKey("notification_preview_enabled")
+    }
+}
+
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/di/RepositoryModule.kt b/android/app/src/main/java/ru/daemonlord/messenger/di/RepositoryModule.kt
index 7796f53..66dab50 100644
--- a/android/app/src/main/java/ru/daemonlord/messenger/di/RepositoryModule.kt
+++ b/android/app/src/main/java/ru/daemonlord/messenger/di/RepositoryModule.kt
@@ -8,10 +8,12 @@ import ru.daemonlord.messenger.data.auth.repository.NetworkAuthRepository
 import ru.daemonlord.messenger.data.chat.repository.NetworkChatRepository
 import ru.daemonlord.messenger.data.media.repository.NetworkMediaRepository
 import ru.daemonlord.messenger.data.message.repository.NetworkMessageRepository
+import ru.daemonlord.messenger.data.notifications.repository.DataStoreNotificationSettingsRepository
 import ru.daemonlord.messenger.domain.auth.repository.AuthRepository
 import ru.daemonlord.messenger.domain.chat.repository.ChatRepository
 import ru.daemonlord.messenger.domain.media.repository.MediaRepository
 import ru.daemonlord.messenger.domain.message.repository.MessageRepository
+import ru.daemonlord.messenger.domain.notifications.repository.NotificationSettingsRepository
 import javax.inject.Singleton
 
 @Module
@@ -41,4 +43,10 @@ abstract class RepositoryModule {
     abstract fun bindMediaRepository(
         repository: NetworkMediaRepository,
     ): MediaRepository
+
+    @Binds
+    @Singleton
+    abstract fun bindNotificationSettingsRepository(
+        repository: DataStoreNotificationSettingsRepository,
+    ): NotificationSettingsRepository
 }
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/domain/notifications/model/ChatNotificationOverride.kt b/android/app/src/main/java/ru/daemonlord/messenger/domain/notifications/model/ChatNotificationOverride.kt
new file mode 100644
index 0000000..451b56c
--- /dev/null
+++ b/android/app/src/main/java/ru/daemonlord/messenger/domain/notifications/model/ChatNotificationOverride.kt
@@ -0,0 +1,8 @@
+package ru.daemonlord.messenger.domain.notifications.model
+
+enum class ChatNotificationOverride {
+    DEFAULT,
+    ENABLED,
+    MUTED,
+}
+
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/domain/notifications/model/NotificationSettings.kt b/android/app/src/main/java/ru/daemonlord/messenger/domain/notifications/model/NotificationSettings.kt
new file mode 100644
index 0000000..9036fed
--- /dev/null
+++ b/android/app/src/main/java/ru/daemonlord/messenger/domain/notifications/model/NotificationSettings.kt
@@ -0,0 +1,7 @@
+package ru.daemonlord.messenger.domain.notifications.model
+
+data class NotificationSettings(
+    val globalEnabled: Boolean = true,
+    val previewEnabled: Boolean = true,
+)
+
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/domain/notifications/repository/NotificationSettingsRepository.kt b/android/app/src/main/java/ru/daemonlord/messenger/domain/notifications/repository/NotificationSettingsRepository.kt
new file mode 100644
index 0000000..abb7720
--- /dev/null
+++ b/android/app/src/main/java/ru/daemonlord/messenger/domain/notifications/repository/NotificationSettingsRepository.kt
@@ -0,0 +1,18 @@
+package ru.daemonlord.messenger.domain.notifications.repository
+
+import kotlinx.coroutines.flow.Flow
+import ru.daemonlord.messenger.domain.notifications.model.ChatNotificationOverride
+import ru.daemonlord.messenger.domain.notifications.model.NotificationSettings
+
+interface NotificationSettingsRepository {
+    fun observeSettings(): Flow<NotificationSettings>
+    suspend fun getSettings(): NotificationSettings
+    suspend fun setGlobalEnabled(enabled: Boolean)
+    suspend fun setPreviewEnabled(enabled: Boolean)
+
+    fun observeChatOverride(chatId: Long): Flow<ChatNotificationOverride>
+    suspend fun getChatOverride(chatId: Long): ChatNotificationOverride
+    suspend fun setChatOverride(chatId: Long, mode: ChatNotificationOverride)
+    suspend fun clearChatOverride(chatId: Long)
+}
+
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/domain/notifications/usecase/ShouldShowMessageNotificationUseCase.kt b/android/app/src/main/java/ru/daemonlord/messenger/domain/notifications/usecase/ShouldShowMessageNotificationUseCase.kt
new file mode 100644
index 0000000..0f57399
--- /dev/null
+++ b/android/app/src/main/java/ru/daemonlord/messenger/domain/notifications/usecase/ShouldShowMessageNotificationUseCase.kt
@@ -0,0 +1,28 @@
+package ru.daemonlord.messenger.domain.notifications.usecase
+
+import ru.daemonlord.messenger.domain.notifications.model.ChatNotificationOverride
+import ru.daemonlord.messenger.domain.notifications.repository.NotificationSettingsRepository
+import javax.inject.Inject
+
+class ShouldShowMessageNotificationUseCase @Inject constructor(
+    private val notificationSettingsRepository: NotificationSettingsRepository,
+) {
+    suspend operator fun invoke(
+        chatId: Long,
+        isMention: Boolean,
+        serverMuted: Boolean,
+    ): Boolean {
+        val settings = notificationSettingsRepository.getSettings()
+        if (!settings.globalEnabled) return false
+
+        val chatOverride = notificationSettingsRepository.getChatOverride(chatId)
+        val effectiveMuted = when (chatOverride) {
+            ChatNotificationOverride.DEFAULT -> serverMuted
+            ChatNotificationOverride.ENABLED -> false
+            ChatNotificationOverride.MUTED -> true
+        }
+
+        return !effectiveMuted || isMention
+    }
+}
+
diff --git a/android/app/src/main/java/ru/daemonlord/messenger/domain/realtime/usecase/HandleRealtimeEventsUseCase.kt b/android/app/src/main/java/ru/daemonlord/messenger/domain/realtime/usecase/HandleRealtimeEventsUseCase.kt
index 9878e0c..96167f4 100644
--- a/android/app/src/main/java/ru/daemonlord/messenger/domain/realtime/usecase/HandleRealtimeEventsUseCase.kt
+++ b/android/app/src/main/java/ru/daemonlord/messenger/domain/realtime/usecase/HandleRealtimeEventsUseCase.kt
@@ -13,6 +13,7 @@ import ru.daemonlord.messenger.core.notifications.NotificationDispatcher
 import ru.daemonlord.messenger.data.message.local.dao.MessageDao
 import ru.daemonlord.messenger.data.message.local.entity.MessageEntity
 import ru.daemonlord.messenger.domain.chat.repository.ChatRepository
+import ru.daemonlord.messenger.domain.notifications.usecase.ShouldShowMessageNotificationUseCase
 import ru.daemonlord.messenger.domain.realtime.RealtimeManager
 import ru.daemonlord.messenger.domain.realtime.model.RealtimeEvent
 import javax.inject.Inject
@@ -26,6 +27,7 @@ class HandleRealtimeEventsUseCase @Inject constructor(
     private val messageDao: MessageDao,
     private val notificationDispatcher: NotificationDispatcher,
     private val activeChatTracker: ActiveChatTracker,
+    private val shouldShowMessageNotificationUseCase: ShouldShowMessageNotificationUseCase,
 ) {
 
     private val scope = CoroutineScope(SupervisorJob() + Dispatchers.IO)
@@ -76,7 +78,12 @@ class HandleRealtimeEventsUseCase @Inject constructor(
                         chatDao.incrementUnread(chatId = event.chatId)
                         val activeChatId = activeChatTracker.activeChatId.value
                         val muted = chatDao.isChatMuted(event.chatId) == true
-                        if (activeChatId != event.chatId && (!muted || event.isMention)) {
+                        val shouldNotify = shouldShowMessageNotificationUseCase(
+                            chatId = event.chatId,
+                            isMention = event.isMention,
+                            serverMuted = muted,
+                        )
+                        if (activeChatId != event.chatId && shouldNotify) {
                             val title = chatDao.getChatDisplayTitle(event.chatId) ?: "New message"
                             val body = event.text?.takeIf { it.isNotBlank() }
                                 ?: when (event.type?.lowercase()) {
diff --git a/android/app/src/test/java/ru/daemonlord/messenger/core/token/DataStoreTokenRepositoryTest.kt b/android/app/src/test/java/ru/daemonlord/messenger/core/token/DataStoreTokenRepositoryTest.kt
index aeb3cd4..96d60d2 100644
--- a/android/app/src/test/java/ru/daemonlord/messenger/core/token/DataStoreTokenRepositoryTest.kt
+++ b/android/app/src/test/java/ru/daemonlord/messenger/core/token/DataStoreTokenRepositoryTest.kt
@@ -2,14 +2,14 @@ package ru.daemonlord.messenger.core.token
 
 import androidx.datastore.core.DataStore
 import androidx.datastore.preferences.core.Preferences
-import androidx.datastore.preferences.core.PreferenceDataStoreFactory
+import androidx.datastore.preferences.core.emptyPreferences
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.test.runTest
-import okio.Path.Companion.toPath
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertNull
 import org.junit.Test
-import java.io.File
 
 @OptIn(ExperimentalCoroutinesApi::class)
 class DataStoreTokenRepositoryTest {
@@ -46,10 +46,18 @@ class DataStoreTokenRepositoryTest {
     }
 
     private fun createTestDataStore(): DataStore<Preferences> {
-        val file = File.createTempFile("tokens", ".preferences_pb")
-        file.deleteOnExit()
-        return PreferenceDataStoreFactory.createWithPath(
-            produceFile = { file.absolutePath.toPath() }
-        )
+        return InMemoryPreferencesDataStore()
+    }
+
+    private class InMemoryPreferencesDataStore : DataStore<Preferences> {
+        private val state = MutableStateFlow<Preferences>(emptyPreferences())
+
+        override val data: Flow<Preferences> = state
+
+        override suspend fun updateData(transform: suspend (t: Preferences) -> Preferences): Preferences {
+            val updated = transform(state.value)
+            state.value = updated
+            return updated
+        }
     }
 }
diff --git a/android/app/src/test/java/ru/daemonlord/messenger/data/notifications/repository/DataStoreNotificationSettingsRepositoryTest.kt b/android/app/src/test/java/ru/daemonlord/messenger/data/notifications/repository/DataStoreNotificationSettingsRepositoryTest.kt
new file mode 100644
index 0000000..5f1dab2
--- /dev/null
+++ b/android/app/src/test/java/ru/daemonlord/messenger/data/notifications/repository/DataStoreNotificationSettingsRepositoryTest.kt
@@ -0,0 +1,67 @@
+package ru.daemonlord.messenger.data.notifications.repository
+
+import androidx.datastore.core.DataStore
+import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.core.emptyPreferences
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.test.runTest
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import ru.daemonlord.messenger.domain.notifications.model.ChatNotificationOverride
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class DataStoreNotificationSettingsRepositoryTest {
+
+    @Test
+    fun saveAndReadGlobalSettings_returnsPersistedValues() = runTest {
+        val repository = DataStoreNotificationSettingsRepository(createTestDataStore())
+
+        repository.setGlobalEnabled(enabled = false)
+        repository.setPreviewEnabled(enabled = false)
+
+        val settings = repository.getSettings()
+        assertFalse(settings.globalEnabled)
+        assertFalse(settings.previewEnabled)
+    }
+
+    @Test
+    fun saveAndReadChatOverride_returnsPersistedValue() = runTest {
+        val repository = DataStoreNotificationSettingsRepository(createTestDataStore())
+
+        repository.setChatOverride(chatId = 42L, mode = ChatNotificationOverride.MUTED)
+
+        val mode = repository.getChatOverride(chatId = 42L)
+        assertEquals(ChatNotificationOverride.MUTED, mode)
+    }
+
+    @Test
+    fun clearChatOverride_resetsToDefault() = runTest {
+        val repository = DataStoreNotificationSettingsRepository(createTestDataStore())
+        repository.setChatOverride(chatId = 42L, mode = ChatNotificationOverride.ENABLED)
+
+        repository.clearChatOverride(chatId = 42L)
+
+        val mode = repository.getChatOverride(chatId = 42L)
+        assertTrue(mode == ChatNotificationOverride.DEFAULT)
+    }
+
+    private fun createTestDataStore(): DataStore<Preferences> {
+        return InMemoryPreferencesDataStore()
+    }
+
+    private class InMemoryPreferencesDataStore : DataStore<Preferences> {
+        private val state = MutableStateFlow<Preferences>(emptyPreferences())
+
+        override val data: Flow<Preferences> = state
+
+        override suspend fun updateData(transform: suspend (t: Preferences) -> Preferences): Preferences {
+            val updated = transform(state.value)
+            state.value = updated
+            return updated
+        }
+    }
+}
diff --git a/android/app/src/test/java/ru/daemonlord/messenger/domain/notifications/usecase/ShouldShowMessageNotificationUseCaseTest.kt b/android/app/src/test/java/ru/daemonlord/messenger/domain/notifications/usecase/ShouldShowMessageNotificationUseCaseTest.kt
new file mode 100644
index 0000000..d02424c
--- /dev/null
+++ b/android/app/src/test/java/ru/daemonlord/messenger/domain/notifications/usecase/ShouldShowMessageNotificationUseCaseTest.kt
@@ -0,0 +1,92 @@
+package ru.daemonlord.messenger.domain.notifications.usecase
+
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.test.runTest
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import ru.daemonlord.messenger.domain.notifications.model.ChatNotificationOverride
+import ru.daemonlord.messenger.domain.notifications.model.NotificationSettings
+import ru.daemonlord.messenger.domain.notifications.repository.NotificationSettingsRepository
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class ShouldShowMessageNotificationUseCaseTest {
+
+    @Test
+    fun globalDisabled_blocksNotifications() = runTest {
+        val repository = FakeNotificationSettingsRepository(
+            settings = NotificationSettings(globalEnabled = false, previewEnabled = true),
+        )
+        val useCase = ShouldShowMessageNotificationUseCase(repository)
+
+        val result = useCase(chatId = 1L, isMention = true, serverMuted = false)
+
+        assertFalse(result)
+    }
+
+    @Test
+    fun mutedChat_allowsMention() = runTest {
+        val repository = FakeNotificationSettingsRepository(
+            settings = NotificationSettings(globalEnabled = true, previewEnabled = true),
+            overrides = mutableMapOf(1L to ChatNotificationOverride.MUTED),
+        )
+        val useCase = ShouldShowMessageNotificationUseCase(repository)
+
+        val result = useCase(chatId = 1L, isMention = true, serverMuted = true)
+
+        assertTrue(result)
+    }
+
+    @Test
+    fun chatOverrideEnabled_unmutesServerMutedChat() = runTest {
+        val repository = FakeNotificationSettingsRepository(
+            settings = NotificationSettings(globalEnabled = true, previewEnabled = true),
+            overrides = mutableMapOf(1L to ChatNotificationOverride.ENABLED),
+        )
+        val useCase = ShouldShowMessageNotificationUseCase(repository)
+
+        val result = useCase(chatId = 1L, isMention = false, serverMuted = true)
+
+        assertTrue(result)
+    }
+
+    private class FakeNotificationSettingsRepository(
+        settings: NotificationSettings,
+        overrides: MutableMap<Long, ChatNotificationOverride> = mutableMapOf(),
+    ) : NotificationSettingsRepository {
+        private val settingsFlow = MutableStateFlow(settings)
+        private val chatOverrides = overrides
+
+        override fun observeSettings(): Flow<NotificationSettings> = settingsFlow
+
+        override suspend fun getSettings(): NotificationSettings = settingsFlow.value
+
+        override suspend fun setGlobalEnabled(enabled: Boolean) {
+            settingsFlow.value = settingsFlow.value.copy(globalEnabled = enabled)
+        }
+
+        override suspend fun setPreviewEnabled(enabled: Boolean) {
+            settingsFlow.value = settingsFlow.value.copy(previewEnabled = enabled)
+        }
+
+        override fun observeChatOverride(chatId: Long): Flow<ChatNotificationOverride> {
+            return settingsFlow.map { chatOverrides[chatId] ?: ChatNotificationOverride.DEFAULT }
+        }
+
+        override suspend fun getChatOverride(chatId: Long): ChatNotificationOverride {
+            return chatOverrides[chatId] ?: ChatNotificationOverride.DEFAULT
+        }
+
+        override suspend fun setChatOverride(chatId: Long, mode: ChatNotificationOverride) {
+            chatOverrides[chatId] = mode
+        }
+
+        override suspend fun clearChatOverride(chatId: Long) {
+            chatOverrides.remove(chatId)
+        }
+    }
+}
+
diff --git a/docs/android-checklist.md b/docs/android-checklist.md
index e6513c9..7ae3393 100644
--- a/docs/android-checklist.md
+++ b/docs/android-checklist.md
@@ -93,6 +93,7 @@
 - [x] Notification channels (Android)
 - [x] Deep links: open chat/message
 - [x] Mention override для muted чатов
+- [x] DataStore настройки уведомлений (global + per-chat override)
 
 ## 13. UI/UX и темы
 - [ ] Светлая/темная тема (читаемая)