Fix EF Core timestamp population by using mutable properties and ValueGenerated configuration

[Copilot]

The CreateAsync_ShouldPersistLamp test failed because Entity Framework Core couldn't populate database-generated timestamps on entities using init accessors. EF Core can only set properties during object construction when using init, but ReloadAsync() operates on existing instances.

Changes

• LampDbEntity.cs: Changed property accessors from init to set to allow post-construction mutation by EF Core
• LampControlDbContext.cs: Added ValueGeneratedOnAdd() for CreatedAt and ValueGeneratedOnAddOrUpdate() for UpdatedAt to signal EF Core these values come from the database

This enables the repository's CreateAsync method to rely on PostgreSQL's DEFAULT CURRENT_TIMESTAMP constraints and update triggers rather than setting timestamps in application code:

var dbEntity = new LampDbEntity
{
    Id = entity.Id,
    IsOn = entity.Status,
    DeletedAt = null,
    // CreatedAt and UpdatedAt omitted - database generates them
};

this.context.Lamps.Add(dbEntity);
await this.context.SaveChangesAsync();
await this.context.Entry(dbEntity).ReloadAsync(); // Now populates timestamps

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

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Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• checkstyle.org
  • Triggering command: /opt/hostedtoolcache/CodeQL/2.23.8/x64/codeql/tools/linux64/java/bin/java /opt/hostedtoolcache/CodeQL/2.23.8/x64/codeql/tools/linux64/java/bin/java -jar /opt/hostedtoolcache/CodeQL/2.23.8/x64/codeql/xml/tools/xml-extractor.jar --fileList=/home/REDACTED/work/lamp-control-api-reference/.codeql-scratch/dbs/csharp/working/files-to-index5987092168840376068.list --sourceArchiveDir=/home/REDACTED/work/lamp-control-api-reference/.codeql-scratch/dbs/csharp/src --outputDir=/home/REDACTED/work/lamp-control-api-reference/.codeql-scratch/dbs/csharp/trap/csharp n.current/8.0.0/ .dotnet/sdk-manifests/8.0.100/microsoft.net.workload.mono.toolchain.current/8.0.0/ 93656f9bd8cfd8f3git by/c4ac5d679fec1add f9906a906e09a05a. ca599a0e5420dff8172.17.0.2 /var�� (dns block)
• crl.comodoca.com
  • Triggering command: /home/REDACTED/work/lamp-control-api-reference/.codeql-scratch/dbs/csharp/working/.dotnet/dotnet /home/REDACTED/work/lamp-control-api-reference/.codeql-scratch/dbs/csharp/working/.dotnet/dotnet restore --no-dependencies /home/REDACTED/work/lamp-control-api-reference/lamp-control-api-reference/src/csharp/LampControlApi/LampControlApi.csproj --packages /home/REDACTED/work/lamp-control-api-reference/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/lamp-control-api-reference/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/lamp-control-api-reference/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot f75/log.json -q create runtime-runc/moby ctl io.containerd.rumkdir Release 0/ ctl (dns block)
• ocsp.comodoca.com
  • Triggering command: /home/REDACTED/work/lamp-control-api-reference/.codeql-scratch/dbs/csharp/working/.dotnet/dotnet /home/REDACTED/work/lamp-control-api-reference/.codeql-scratch/dbs/csharp/working/.dotnet/dotnet restore --no-dependencies /home/REDACTED/work/lamp-control-api-reference/lamp-control-api-reference/src/csharp/LampControlApi/LampControlApi.csproj --packages /home/REDACTED/work/lamp-control-api-reference/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/lamp-control-api-reference/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/lamp-control-api-reference/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot f75/log.json -q create runtime-runc/moby ctl io.containerd.rumkdir Release 0/ ctl (dns block)

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