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public async Task<IActionResult> Upsert(BulkUpsertRequest request)
{
    request.Devices.ForEach(d =>
    {
        var device = new Device(d.Id, d.Name, d.Metadata.Select(...));
        _dbContext.Entry(device).IsModified = true;
    })

    await _dbContext.SaveAsync();
}

johnknoop

namespace DeviceService.Api.Contracts;

public record DeviceMetadata(Guid MetadataFieldId, System.Text.Json.JsonElement Value);
public record DeviceToCreate(Guid DeviceTypeId, string DeviceName, IList<DeviceMetadata> MetaData);
public record BulkCreateDevicesRequest(IList<DeviceToCreate> Devices);

/*
 
Example:

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