SyncFilter class

Sync filter for selective synchronization

Allows filtering which data gets synced based on conditions, timestamps, and other criteria. This is essential for:

• Privacy: Users don't want to download everyone's data
• Bandwidth: Mobile users have limited data plans
• Storage: Devices have limited space
• Security: Multi-tenant apps need user isolation
• Legal: GDPR requires data minimization

Example:

final config = SyncConfig(
  baseUrl: 'https://api.example.com',
  collections: ['todos', 'notes'],
  syncFilters: {
    'todos': SyncFilter(
      where: {'userId': currentUserId},
      since: DateTime.now().subtract(Duration(days: 30)),
    ),
    'notes': SyncFilter(
      where: {
        'userId': currentUserId,
        'archived': false,
      },
    ),
  },
);