background thread full/incremental sync operations. pool sqlconnection. sqlconnection to FullMutex mode for multithread environment. try/catch decryption errors.

src/iOS.Core/Services/SqlService.cs

@@ -2,24 +2,31 @@
 using System.IO;
 using Bit.App.Abstractions;
 using Foundation;
+using SQLite;
 
 namespace Bit.iOS.Core.Services
 {
     public class SqlService : ISqlService
     {
-        public SQLite.SQLiteConnection GetConnection()
+        private SQLiteConnection _connection;
+
+        public SQLiteConnection GetConnection()
         {
+            if(_connection != null)
+            {
+                return _connection;
+            }
+
             var sqliteFilename = "bitwarden.db3";
             var fileManager = new NSFileManager();
             var appGroupContainer = fileManager.GetContainerUrl("group.com.8bit.bitwarden");
             var libraryPath = Path.Combine(appGroupContainer.Path, "Library"); // Library folder
             var path = Path.Combine(libraryPath, sqliteFilename);
-
             Console.WriteLine(path);
-            var conn = new SQLite.SQLiteConnection(path);
 
-            // Return the database connection 
-            return conn;
+            _connection = new SQLiteConnection(path,
+               SQLiteOpenFlags.ReadWrite | SQLiteOpenFlags.Create | SQLiteOpenFlags.FullMutex | SQLiteOpenFlags.SharedCache);
+            return _connection;
         }
     }
 }