diff --git a/app/src/main/java/com/mirenkov/ktheightmap/SettingsActivity.kt b/app/src/main/java/com/mirenkov/ktheightmap/SettingsActivity.kt
index 8cb2376..7ba8f2c 100644
--- a/app/src/main/java/com/mirenkov/ktheightmap/SettingsActivity.kt
+++ b/app/src/main/java/com/mirenkov/ktheightmap/SettingsActivity.kt
@@ -86,9 +86,15 @@ fun SettingsMain(vm: TileViewModel, launcher: ActivityResultLauncher<DocumentFil
                         }
                         else
                             Log.i(TAG, "found in db: %d, %d, %d".format(t.level, t.x, t.y))
+                        }
                     }
                 }
-            } }) { Text(text = "Load database") }
+            }) { Text(text = "Load database") }
+            Button(onClick = {
+                coroutineScope.launch {
+                    vm.repository.clearTiles()
+                }
+            }) { Text(text = "Clear database") }
         }
     }
 }
diff --git a/app/src/main/java/com/mirenkov/ktheightmap/TileRepository.kt b/app/src/main/java/com/mirenkov/ktheightmap/TileRepository.kt
index 0626e58..655ace9 100644
--- a/app/src/main/java/com/mirenkov/ktheightmap/TileRepository.kt
+++ b/app/src/main/java/com/mirenkov/ktheightmap/TileRepository.kt
@@ -1,9 +1,7 @@
 package com.mirenkov.ktheightmap
 
-import android.util.Log
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.async
 import kotlinx.coroutines.launch
 
@@ -14,7 +12,6 @@ class TileRepository(private val tileDao: TileDao) {
         coroutineScope.launch(Dispatchers.IO) { tileDao.pushTile(tile) }
     }
 
-    @OptIn(ExperimentalCoroutinesApi::class)
     suspend fun getTile(x: Int, y: Int, level: Int): Tile? {
         val tileDeferred = coroutineScope.async(Dispatchers.IO) {
             tileDao.getTile(x, y, level)