refactor: database multi-period schedule storage

app/src/main/java/agzam/vyatsu/ui/schedule/ScheduleScreen.kt

@@ -94,6 +94,17 @@ fun ScheduleScreen(viewModel: ScheduleViewModel, onSwitchGroup: () -> Unit) {
                             "$dayLabel ${dayName(day.date.dayOfWeek)} · ${day.date.format(FULL_DATE)}",
                             style = MaterialTheme.typography.titleMedium
                         )
+                        Row(
+                            Modifier.fillMaxWidth(),
+                            horizontalArrangement = Arrangement.spacedBy(8.dp)
+                        ) {
+                            TextButton(onClick = { viewModel.clearSelectedPeriod() }) {
+                                Text("Очистить неделю")
+                            }
+                            TextButton(onClick = { viewModel.clearAll() }) {
+                                Text("Очистить всё")
+                            }
+                        }
                         HorizontalDivider(Modifier.padding(vertical = 8.dp))
 
                         DayChips(

app/src/main/java/agzam/vyatsu/ui/schedule/ScheduleViewModel.kt

@@ -93,6 +93,23 @@ class ScheduleViewModel(
         _uiState.value = _uiState.value.copy(selectedIndex = index)
     }
 
+    fun clearAll() {
+        val groupId = currentGroupId ?: return
+        viewModelScope.launch {
+            scheduleRepository.clearAll(groupId)
+        }
+    }
+
+    fun clearSelectedPeriod() {
+        val state = _uiState.value
+        val schedule = state.schedule ?: return
+        val day = schedule.days.getOrNull(state.selectedIndex) ?: return
+        val period = schedule.periodOf(day.date) ?: return
+        viewModelScope.launch {
+            scheduleRepository.clearPeriod(schedule.groupId, period)
+        }
+    }
+
     private fun todayIndex(days: List<Day>): Int {
         if (days.isEmpty()) return 0
         val today = ScheduleDates.moscowToday()