diff --git a/android/app/src/main/java/chat/rocket/reactnative/MainApplication.kt b/android/app/src/main/java/chat/rocket/reactnative/MainApplication.kt
index 56c88d46277..a25bd87acf8 100644
--- a/android/app/src/main/java/chat/rocket/reactnative/MainApplication.kt
+++ b/android/app/src/main/java/chat/rocket/reactnative/MainApplication.kt
@@ -66,15 +66,18 @@ open class MainApplication : Application(), ReactApplication {
 
   override fun onCreate() {
     super.onCreate()
+
     Bugsnag.start(this)
-    
+
+    migrateLegacyExperimentalDatabases()
+
     // Initialize MMKV encryption - reads existing key or generates new one
     // Must run before React Native starts to avoid race conditions
     MMKVKeyManager.initialize(this)
 
     // Load the native entry point for the New Architecture
     loadReactNative(this)
-    
+
 		ApplicationLifecycleDispatcher.onApplicationCreate(this)
   }
 
@@ -82,4 +85,30 @@ open class MainApplication : Application(), ReactApplication {
     super.onConfigurationChanged(newConfig)
     ApplicationLifecycleDispatcher.onConfigurationChanged(this, newConfig)
   }
+
+  // Renames <=4.72.0 `-experimental.db.db` files.
+  private fun migrateLegacyExperimentalDatabases() {
+    val dir = java.io.File(applicationInfo.dataDir)
+    val legacySuffix = "-experimental.db.db"
+    val files = dir.listFiles() ?: return
+    for (legacy in files) {
+      if (!legacy.isFile || !legacy.name.endsWith(legacySuffix)) {
+        continue
+      }
+      val baseName = legacy.name.removeSuffix(legacySuffix)
+      val target = java.io.File(dir, "$baseName.db.db")
+      if (target.exists() && target.length() > 0) {
+        continue
+      }
+      for (suffix in listOf("-wal", "-shm", "-journal", "")) {
+        val from = java.io.File(dir, legacy.name + suffix)
+        val to = java.io.File(dir, target.name + suffix)
+        to.delete()
+        if (from.exists() && !from.renameTo(to)) {
+          // Starting with a fresh DB at `target` would strand the legacy data, since later launches skip a non-empty target.
+          throw IllegalStateException("Failed to migrate ${from.name} to ${to.name}")
+        }
+      }
+    }
+  }
 }
diff --git a/ios/AppDelegate.swift b/ios/AppDelegate.swift
index 2699b2c7fba..bdfe963330c 100644
--- a/ios/AppDelegate.swift
+++ b/ios/AppDelegate.swift
@@ -22,9 +22,10 @@ public class AppDelegate: ExpoAppDelegate {
     // This reads existing encryption key or generates a new one for fresh installs
     // Must run before Firebase, Bugsnag, and React Native start
     MMKVKeyManager.initialize()
-    
+
     FirebaseApp.configure()
     Bugsnag.start()
+    migrateLegacyExperimentalDatabases()
     ReplyNotification.configure()
     if !VoipRegion.isChina() {
       VoipService.voipRegistration()
@@ -69,6 +70,39 @@ public class AppDelegate: ExpoAppDelegate {
     return result
   }
 
+  // Renames <=4.72.0 `-experimental.db` files; a 0-byte target is one NotificationService created.
+  private func migrateLegacyExperimentalDatabases() {
+    let fileManager = FileManager.default
+    guard let suite = Bundle.main.object(forInfoDictionaryKey: "AppGroupIdentifier") as? String,
+      let containerURL = fileManager.containerURL(forSecurityApplicationGroupIdentifier: suite),
+      let files = try? fileManager.contentsOfDirectory(at: containerURL, includingPropertiesForKeys: nil)
+    else {
+      return
+    }
+    let legacySuffix = "-experimental.db"
+    for legacy in files {
+      let name = legacy.lastPathComponent
+      guard name.hasSuffix(legacySuffix) else { continue }
+      let target = containerURL.appendingPathComponent(String(name.dropLast(legacySuffix.count)) + ".db")
+      if let targetSize = (try? fileManager.attributesOfItem(atPath: target.path))?[.size] as? Int, targetSize > 0 {
+        continue
+      }
+      for suffix in ["-wal", "-shm", "-journal", ""] {
+        let from = URL(fileURLWithPath: legacy.path + suffix)
+        let to = URL(fileURLWithPath: target.path + suffix)
+        try? fileManager.removeItem(at: to)
+        guard fileManager.fileExists(atPath: from.path) else { continue }
+        do {
+          try fileManager.moveItem(at: from, to: to)
+        } catch {
+          // Starting with a fresh DB at `target` would strand the legacy data, since later launches skip a non-empty target.
+          Bugsnag.notifyError(error)
+          fatalError("Failed to migrate \(from.lastPathComponent) to \(to.lastPathComponent): \(error)")
+        }
+      }
+    }
+  }
+
   // Linking API
   public override func application(
     _ app: UIApplication,