fix: use create if not exists clause for indexes (#20728)

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>

mobile/lib/infrastructure/entities/exif.entity.dart

@@ -95,7 +95,7 @@ class ExifInfo {
   );
 }
 
-@TableIndex(name: 'idx_lat_lng', columns: {#latitude, #longitude})
+@TableIndex.sql('CREATE INDEX IF NOT EXISTS idx_lat_lng ON remote_exif_entity (latitude, longitude)')
 class RemoteExifEntity extends Table with DriftDefaultsMixin {
   const RemoteExifEntity();