Add 'Clear all' button to wipe the tracker list

Trash action in the top bar (shown when the list is non-empty) clears all tracker rows + sighting history via repo.clearAll(). Devices re-populate as they're re-detected; learned baseline places are kept. Release 0.1.4.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0187UiEtasyowhEBYs6s9iF5

app/build.gradle.kts

@@ -13,8 +13,8 @@ android {
         applicationId = "org.soulstone.vigil"
         minSdk = 26
         targetSdk = 35
-        versionCode = 3
+        versionCode = 5
-        versionName = "0.1.2"
+        versionName = "0.1.4"
     }
 
     // Fixed debug keystore committed to the repo (a debug key is non-secret — its

app/src/main/kotlin/org/soulstone/vigil/MainActivity.kt

@@ -95,7 +95,8 @@ class MainActivity : ComponentActivity() {
                     onDistrust = { id ->
                         lifecycleScope.launch { repo.clearBaseline(id) }
                     },
-                    onRing = { tracker -> ringTracker(tracker) }
+                    onRing = { tracker -> ringTracker(tracker) },
+                    onClearAll = { lifecycleScope.launch { repo.clearAll() } }
                 )
             }
         }

app/src/main/kotlin/org/soulstone/vigil/data/TrackerRepository.kt

@@ -44,6 +44,13 @@ class TrackerRepository(private val db: VigilDatabase) {
         db.trackerDao().pruneStale(cutoff)
     }
 
+    /** Wipe the whole tracker list + sighting history (they re-populate as devices
+     *  are re-detected). Keeps learned baseline places. */
+    suspend fun clearAll() = mutex.withLock {
+        db.trackerDao().clearAll()
+        db.sightingDao().clearAll()
+    }
+
     /**
      * Ingest one sighting. Persists it, updates the baseline, and re-evaluates the
      * tracker's risk. Returns the updated row and whether this crossed into ALERTING.

app/src/main/kotlin/org/soulstone/vigil/data/db/VigilDatabase.kt

@@ -91,6 +91,9 @@ interface TrackerDao {
     // stale, non-approved rows so the table and the UI list don't grow without bound.
     @Query("DELETE FROM trackers WHERE lastSeen < :cutoff AND approved = 0")
     suspend fun pruneStale(cutoff: Long)
+
+    @Query("DELETE FROM trackers")
+    suspend fun clearAll()
 }
 
 @Dao
@@ -103,6 +106,9 @@ interface SightingDao {
 
     @Query("DELETE FROM sightings WHERE timestamp < :cutoff")
     suspend fun prune(cutoff: Long)
+
+    @Query("DELETE FROM sightings")
+    suspend fun clearAll()
 }
 
 @Dao

app/src/main/kotlin/org/soulstone/vigil/ui/MainScreen.kt

@@ -1,6 +1,7 @@
 package org.soulstone.vigil.ui
 
 import android.text.format.DateUtils
+import androidx.activity.compose.BackHandler
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.material.icons.filled.NotificationsActive
 import androidx.compose.material.icons.filled.Sensors
@@ -27,6 +28,7 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Bluetooth
 import androidx.compose.material.icons.filled.CheckCircle
+import androidx.compose.material.icons.filled.DeleteSweep
 import androidx.compose.material.icons.filled.GppMaybe
 import androidx.compose.material.icons.filled.Lock
 import androidx.compose.material.icons.filled.Radar
@@ -41,6 +43,7 @@ import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.FilterChip
 import androidx.compose.material3.FilterChipDefaults
 import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.ModalBottomSheet
 import androidx.compose.material3.Scaffold
@@ -83,7 +86,8 @@ fun MainScreen(
     onSetSensitivity: (Sensitivity) -> Unit,
     onApprove: (String, Boolean) -> Unit,
     onDistrust: (String) -> Unit,
-    onRing: (TrackerEntity) -> Unit
+    onRing: (TrackerEntity) -> Unit,
+    onClearAll: () -> Unit
 ) {
     var detail by remember { mutableStateOf<TrackerEntity?>(null) }
     var finding by remember { mutableStateOf<TrackerEntity?>(null) }
@@ -108,6 +112,15 @@ fun MainScreen(
                     }
                 },
                 actions = {
+                    if (trackers.isNotEmpty()) {
+                        IconButton(onClick = onClearAll) {
+                            Icon(
+                                Icons.Filled.DeleteSweep,
+                                contentDescription = "Clear all trackers",
+                                tint = MaterialTheme.colorScheme.onSurfaceVariant
+                            )
+                        }
+                    }
                     Row(verticalAlignment = Alignment.CenterVertically, modifier = Modifier.padding(end = 12.dp)) {
                         Icon(
                             Icons.Filled.Lock, null,
@@ -432,6 +445,8 @@ private fun DetailRow(label: String, value: String) {
  *  proximity meter. Works even on silent/modified tags that refuse to ring. */
 @Composable
 private fun FinderScreen(t: TrackerEntity, onRing: (TrackerEntity) -> Unit, onClose: () -> Unit) {
+    // Intercept system back so it closes the finder instead of exiting the app.
+    BackHandler(onBack = onClose)
     val rssi by ScanService.finderRssi.collectAsState()
     val smoothed = remember { mutableStateOf(-100f) }
     LaunchedEffect(rssi) { rssi?.let { smoothed.value = 0.35f * it + 0.65f * smoothed.value } }