Fix 5 notification reliability issues

1. Remove println debug statement from ReminderScheduler

2. Drop scheduledIds tracking — AlarmManager deduplicates via
   FLAG_UPDATE_CURRENT, and the tracking prevented rescheduling
   when a task's due time was edited

3. TaskCheckWorker uses live app DB via liveMemosProvider when
   available, falls back to opening its own DB only when the
   app process isn't running (boot receiver, background check)

4. Default notify time synced from DataStore to SharedPreferences
   via syncNotifyTime() — both DirectAlarmScheduler and
   TaskCheckWorker now read from the same source via
   readDefaultNotifyTime() helper

5. TaskReminderReceiver triggers runTaskCheckNow() after each
   alarm fires, so the next alarm is scheduled immediately
   instead of waiting up to 15 min for WorkManager

Signed-off-by: Avinal Kumar <avinal.xlvii@gmail.com>
Co-Authored-By: Claude Opus 4.6 (1M context)

composeApp/src/androidMain/kotlin/com/avinal/memos/notifications/DirectAlarmScheduler.kt

@@ -7,7 +7,6 @@ import android.content.Intent
 import com.avinal.memos.domain.Memo
 import com.avinal.memos.parser.TaskParser
 import kotlin.time.Clock
-import kotlinx.datetime.LocalTime
 import kotlinx.datetime.TimeZone
 
 object DirectAlarmScheduler {
@@ -17,12 +16,9 @@ object DirectAlarmScheduler {
         val nowMillis = Clock.System.now().toEpochMilliseconds()
         val tz = TimeZone.currentSystemDefault()
 
-        val prefs = context.getSharedPreferences("memos_prefs", Context.MODE_PRIVATE)
-        val defaultTimeStr = prefs.getString("default_notify_time", "20:00") ?: "20:00"
-        val parts = defaultTimeStr.split(":")
-        val defaultTime = try { LocalTime(parts[0].toInt(), parts.getOrElse(1) { "0" }.toInt()) } catch (_: Exception) { LocalTime(20, 0) }
+        val defaultTime = readDefaultNotifyTime(context)
 
-        val alarms = ReminderScheduler.computeAlarms(allTasks, nowMillis, tz, emptySet(), defaultTime)
+        val alarms = ReminderScheduler.computeAlarms(allTasks, nowMillis, tz, defaultTime)
         val alarmManager = context.getSystemService(Context.ALARM_SERVICE) as AlarmManager
 
         alarms.forEach { alarm ->

composeApp/src/androidMain/kotlin/com/avinal/memos/notifications/NotifyTimeHelper.kt

@@ -0,0 +1,20 @@
+package com.avinal.memos.notifications
+
+import android.content.Context
+import kotlinx.datetime.LocalTime
+
+fun readDefaultNotifyTime(context: Context): LocalTime {
+    val prefs = context.getSharedPreferences("nikki_notify", Context.MODE_PRIVATE)
+    val timeStr = prefs.getString("default_notify_time", "20:00") ?: "20:00"
+    val parts = timeStr.split(":")
+    return try {
+        LocalTime(parts[0].toInt(), parts.getOrElse(1) { "0" }.toInt())
+    } catch (_: Exception) {
+        LocalTime(20, 0)
+    }
+}
+
+fun writeDefaultNotifyTime(context: Context, time: String) {
+    context.getSharedPreferences("nikki_notify", Context.MODE_PRIVATE)
+        .edit().putString("default_notify_time", time).apply()
+}

composeApp/src/androidMain/kotlin/com/avinal/memos/notifications/TaskCheckWorker.kt

@@ -21,20 +21,26 @@ class TaskCheckWorker(
 ) : CoroutineWorker(appContext, params) {
 
     override suspend fun doWork(): Result {
-        val prefs = appContext.getSharedPreferences("task_notifications", Context.MODE_PRIVATE)
-        val scheduledIds = prefs.getStringSet("scheduled_ids", emptySet()) ?: emptySet()
         val nowMillis = Clock.System.now().toEpochMilliseconds()
+        val defaultTime = readDefaultNotifyTime(appContext)
 
-        // Read default notify time from DataStore file (shared prefs fallback)
-        val notifyPrefs = appContext.getSharedPreferences("memos_prefs", Context.MODE_PRIVATE)
-        val defaultTimeStr = notifyPrefs.getString("default_notify_time", "20:00") ?: "20:00"
-        val defaultTimeParts = defaultTimeStr.split(":")
-        val defaultTime = try {
-            kotlinx.datetime.LocalTime(defaultTimeParts[0].toInt(), defaultTimeParts.getOrElse(1) { "0" }.toInt())
-        } catch (_: Exception) {
-            kotlinx.datetime.LocalTime(20, 0)
+        val memos = com.avinal.memos.util.liveMemosProvider?.invoke()
+            ?: readMemosFromDb()
+
+        val allTasks = memos.flatMap { memo -> TaskParser.extractTasks(memo.id, memo.content, memo.tags) }
+        val alarmManager = appContext.getSystemService(Context.ALARM_SERVICE) as AlarmManager
+        val tz = TimeZone.currentSystemDefault()
+
+        val alarms = ReminderScheduler.computeAlarms(allTasks, nowMillis, tz, defaultTime)
+
+        alarms.forEach { alarm ->
+            scheduleAlarm(alarmManager, alarm.taskId, alarm.taskText, alarm.label, alarm.triggerAtMillis, alarm.priority)
         }
 
+        return Result.success()
+    }
+
+    private suspend fun readMemosFromDb(): List<com.avinal.memos.domain.Memo> {
         val db = Room.databaseBuilder<MemosDatabase>(
             context = appContext,
             name = appContext.getDatabasePath("memos.db").absolutePath,
@@ -44,33 +50,11 @@ class TaskCheckWorker(
             .setQueryCoroutineContext(Dispatchers.IO)
             .build()
 
-        try {
-            val memos = db.memoDao().getAll().map { it.toDomain() }
-            val allTasks = memos.flatMap { memo -> TaskParser.extractTasks(memo.id, memo.content, memo.tags) }
-            val alarmManager = appContext.getSystemService(Context.ALARM_SERVICE) as AlarmManager
-            val tz = TimeZone.currentSystemDefault()
-
-            val alarms = ReminderScheduler.computeAlarms(allTasks, nowMillis, tz, scheduledIds, defaultTime)
-
-            alarms.forEach { alarm ->
-                scheduleAlarm(alarmManager, alarm.taskId, alarm.taskText, alarm.label, alarm.triggerAtMillis, alarm.priority)
-            }
-
-            val newScheduledIds = scheduledIds.toMutableSet()
-            alarms.forEach { newScheduledIds.add(it.taskId) }
-
-            val activeTaskIds = allTasks.filter { !it.isCompleted }.map { it.id }.toSet()
-            val cleaned = newScheduledIds.filter { id ->
-                val baseId = id.removeSuffix("_am").removeSuffix("_pm").removeSuffix("_remind")
-                baseId in activeTaskIds
-            }.toSet()
-
-            prefs.edit().putStringSet("scheduled_ids", cleaned).apply()
+        return try {
+            db.memoDao().getAll().map { it.toDomain() }
         } finally {
             db.close()
         }
-
-        return Result.success()
     }
 
     private fun scheduleAlarm(
@@ -103,7 +87,6 @@ class TaskCheckWorker(
         try {
             alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, triggerAtMillis, pendingIntent)
         } catch (_: SecurityException) {
-            // Fallback if exact alarm permission not granted
             alarmManager.set(AlarmManager.RTC_WAKEUP, triggerAtMillis, pendingIntent)
         }
     }

composeApp/src/androidMain/kotlin/com/avinal/memos/util/PlatformNotification.android.kt

@@ -6,12 +6,18 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 
-private var liveMemosProvider: (() -> List<com.avinal.memos.domain.Memo>)? = null
+var liveMemosProvider: (() -> List<com.avinal.memos.domain.Memo>)? = null
+    private set
 
 actual fun setLiveMemosProvider(provider: () -> List<com.avinal.memos.domain.Memo>) {
     liveMemosProvider = provider
 }
 
+actual fun syncNotifyTime(time: String) {
+    val ctx = appContext ?: return
+    com.avinal.memos.notifications.writeDefaultNotifyTime(ctx, time)
+}
+
 actual fun triggerReminderCheck() {
     val ctx = appContext ?: return
     val memos = liveMemosProvider?.invoke()

composeApp/src/commonMain/kotlin/com/avinal/memos/AppDependencies.kt

@@ -14,6 +14,7 @@ import kotlinx.coroutines.IO
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
 import com.avinal.memos.db.entity.toDomain
+import com.avinal.memos.util.syncNotifyTime
 
 class AppDependencies(
     dataStorePath: String,
@@ -55,6 +56,7 @@ class AppDependencies(
             launch { tokenStore.accessToken.collect { cachedToken = it } }
             launch { tokenStore.serverUrl.collect { cachedServerUrl = it } }
             launch { tokenStore.syncInterval.collect { memoRepository.syncIntervalMinutes = it } }
+            launch { tokenStore.defaultNotifyTime.collect { syncNotifyTime(it) } }
             launch { initializeLiveMemosProvider() }
         }
     }

composeApp/src/commonMain/kotlin/com/avinal/memos/notifications/ReminderScheduler.kt

@@ -34,7 +34,6 @@ object ReminderScheduler {
         tasks: List<Task>,
         nowMillis: Long,
         timeZone: TimeZone,
-        alreadyScheduledIds: Set<String> = emptySet(),
         defaultTime: LocalTime = LocalTime(20, 0),
     ): List<ScheduledAlarm> {
         val alarms = mutableListOf<ScheduledAlarm>()
@@ -48,8 +47,6 @@ object ReminderScheduler {
 
             val dueMs = effectiveDate.atTime(effectiveTime).toInstant(timeZone).toEpochMilliseconds()
 
-            println("ReminderScheduler: task=${task.text} effectiveDate=$effectiveDate effectiveTime=$effectiveTime dueMs=$dueMs nowMillis=$nowMillis future=${dueMs > nowMillis}")
-
             // Explicit reminder: fire at dueDateTime - duration
             if (task.reminder != null) {
                 val offsetMs = durationToMillis(task.reminder)

composeApp/src/commonMain/kotlin/com/avinal/memos/util/PlatformNotification.kt

@@ -2,3 +2,4 @@ package com.avinal.memos.util
 
 expect fun triggerReminderCheck()
 expect fun setLiveMemosProvider(provider: () -> List<com.avinal.memos.domain.Memo>)
+expect fun syncNotifyTime(time: String)

composeApp/src/commonTest/kotlin/com/avinal/memos/ReminderSchedulerTest.kt

@@ -29,7 +29,7 @@ class ReminderSchedulerTest {
         reminder = reminder, priority = priority)
 
     private fun compute(tasks: List<Task>, now: Long = nowMillis) =
-        ReminderScheduler.computeAlarms(tasks, now, tz, emptySet(), defaultTime)
+        ReminderScheduler.computeAlarms(tasks, now, tz, defaultTime)
 
     @Test fun completedNoAlarms() { assertTrue(compute(listOf(task(completed = true))).isEmpty()) }
     @Test fun noDateNoTimeNoAlarms() { assertTrue(compute(listOf(task(date = null, time = null))).isEmpty()) }
@@ -128,7 +128,7 @@ class ReminderSchedulerTest {
 
     @Test fun customDefaultTime() {
         val alarms = ReminderScheduler.computeAlarms(
-            listOf(task()), nowMillis, tz, emptySet(), LocalTime(9, 0)
+            listOf(task()), nowMillis, tz, LocalTime(9, 0)
         )
         val expected = dueDate.atTime(LocalTime(9, 0)).toInstant(tz).toEpochMilliseconds()
         assertEquals(expected, alarms[0].triggerAtMillis)

composeApp/src/iosMain/kotlin/com/avinal/memos/util/PlatformNotification.ios.kt

@@ -2,3 +2,4 @@ package com.avinal.memos.util
 
 actual fun triggerReminderCheck() {}
 actual fun setLiveMemosProvider(provider: () -> List<com.avinal.memos.domain.Memo>) {}
+actual fun syncNotifyTime(time: String) {}