Attempt to rebuild the FTS index in DB error handler.

app/src/main/java/org/thoughtcrime/securesms/database/SearchTable.kt

@@ -258,6 +258,14 @@ class SearchTable(context: Context, databaseHelper: SignalDatabase) : DatabaseTa
     return true
   }
 
+  /**
+   * Rebuilds the FTS index.
+   * Warning: This could be very expensive! (often seconds)
+   */
+  fun rebuildIndex(db: SQLiteDatabase = writableDatabase.sqlCipherDatabase) {
+    db.execSQL("INSERT INTO $FTS_TABLE_NAME($FTS_TABLE_NAME) VALUES('rebuild')")
+  }
+
   /**
    * Drops all tables and recreates them.
    */

app/src/main/java/org/thoughtcrime/securesms/database/SqlCipherErrorHandler.kt

@@ -165,16 +165,16 @@ class SqlCipherErrorHandler(private val application: Application, private val da
   }
 
   private fun attemptToClearFullTextSearchIndex(db: SQLiteDatabase) {
-//    try {
-//      try {
-//        db.reopenReadWrite()
-//      } catch (e: Exception) {
-//        Log.w(TAG, "Failed to re-open as read-write!", e)
-//      }
-//      SignalDatabase.messageSearch.fullyResetTables(db, useTransaction = false)
-//    } catch (e: Throwable) {
-//      Log.w(TAG, "Failed to clear full text search index.", e)
-//    }
+    try {
+      try {
+        db.reopenReadWrite()
+      } catch (e: Exception) {
+        Log.w(TAG, "Failed to re-open as read-write!", e)
+      }
+      SignalDatabase.messageSearch.rebuildIndex(db)
+    } catch (e: Throwable) {
+      Log.w(TAG, "Failed to rebuild the full text search index.", e)
+    }
   }
 
   private sealed class DiagnosticResults(val logs: String) {