fix: ssl error & offline teacher schedule

app/src/main/java/agzam/vyatsu/data/local/TeacherScheduleDao.kt

@@ -33,6 +33,9 @@ interface TeacherScheduleDao {
     @Query("DELETE FROM teacher_schedules")
     suspend fun deleteAll()
 
+    @Query("SELECT lastSyncedAt FROM teacher_schedules WHERE departmentId = :departmentId AND season = :season AND weekStart = :weekStart")
+    suspend fun lastSyncedAt(departmentId: String, season: String, weekStart: Long): Long?
+
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     suspend fun insertDays(days: List<TeacherDayEntity>): List<Long>
 
@@ -41,6 +44,7 @@ interface TeacherScheduleDao {
 
     @Transaction
     suspend fun replaceSchedule(schedule: TeacherScheduleEntity, days: List<TeacherDayEntity>, lessons: List<TeacherLessonEntity>) {
+        deleteSchedule(schedule.departmentId, schedule.season.name, schedule.weekStart)
         val scheduleId = insertSchedule(schedule)
         val daysWithScheduleId = days.map { it.copy(scheduleId = scheduleId) }
         deleteDaysForSchedule(scheduleId)