# Database Verification Requirements

**Version:** 1.0.0
**Status:** ACTIVE
**Last Updated:** 2025-12-04

---

## Purpose

This document defines the verification and testing requirements for the MongoDB to PostgreSQL conversion. It ensures that the conversion maintains data integrity, determinism, and functional correctness.

---

## Module Verification Reports

| Module | Status | Report | Date |
| --- | --- | --- | --- |
| Authority | PASS | `docs/db/reports/authority-verification-2025-12-03.md` | 2025-12-03 |
| Notify | PASS | `docs/db/reports/notify-verification-2025-12-02.md` | 2025-12-02 |
| Scheduler | PENDING | _TBD_ | — |
| Policy | PENDING | _TBD_ | — |
| Concelier (Vuln) | PENDING | _TBD_ | — |
| Excititor (VEX/Graph) | PENDING | _TBD_ | — |

---

## 1. Verification Principles

### 1.1 Core Guarantees

The conversion MUST maintain these guarantees:

| Guarantee | Description | Verification Method |
|-----------|-------------|---------------------|
| **Data Integrity** | No data loss during conversion | Record count comparison, checksum validation |
| **Determinism** | Same inputs produce identical outputs | Parallel pipeline comparison |
| **Functional Equivalence** | APIs behave identically | Integration test suite |
| **Performance Parity** | No significant degradation | Benchmark comparison |
| **Tenant Isolation** | Data remains properly isolated | Cross-tenant query tests |

### 1.2 Verification Levels

```
Level 1: Unit Tests
    └── Individual repository method correctness

Level 2: Integration Tests
    └── End-to-end repository operations with real PostgreSQL

Level 3: Comparison Tests
    └── MongoDB vs PostgreSQL output comparison

Level 4: Load Tests
    └── Performance and scalability verification

Level 5: Production Verification
    └── Dual-write monitoring and validation
```

---

## 2. Test Infrastructure

### 2.1 Testcontainers Setup

All PostgreSQL integration tests MUST use Testcontainers:

```csharp
public sealed class PostgresTestFixture : IAsyncLifetime
{
    private readonly PostgreSqlContainer _container;
    private NpgsqlDataSource? _dataSource;

    public PostgresTestFixture()
    {
        _container = new PostgreSqlBuilder()
            .WithImage("postgres:16-alpine")
            .WithDatabase("stellaops_test")
            .WithUsername("test")
            .WithPassword("test")
            .WithWaitStrategy(Wait.ForUnixContainer()
                .UntilPortIsAvailable(5432))
            .Build();
    }

    public string ConnectionString => _container.GetConnectionString();
    public NpgsqlDataSource DataSource => _dataSource
        ?? throw new InvalidOperationException("Not initialized");

    public async Task InitializeAsync()
    {
        await _container.StartAsync();
        _dataSource = NpgsqlDataSource.Create(ConnectionString);
        await RunMigrationsAsync();
    }

    public async Task DisposeAsync()
    {
        if (_dataSource is not null)
            await _dataSource.DisposeAsync();
        await _container.DisposeAsync();
    }

    private async Task RunMigrationsAsync()
    {
        await using var connection = await _dataSource!.OpenConnectionAsync();
        var migrationRunner = new PostgresMigrationRunner(_dataSource, GetMigrations());
        await migrationRunner.RunAsync();
    }
}
```

### 2.2 Test Database State Management

```csharp
public abstract class PostgresRepositoryTestBase : IAsyncLifetime
{
    protected readonly PostgresTestFixture Fixture;
    protected NpgsqlConnection Connection = null!;
    protected NpgsqlTransaction Transaction = null!;

    protected PostgresRepositoryTestBase(PostgresTestFixture fixture)
    {
        Fixture = fixture;
    }

    public async Task InitializeAsync()
    {
        Connection = await Fixture.DataSource.OpenConnectionAsync();
        Transaction = await Connection.BeginTransactionAsync();

        // Set test tenant context
        await using var cmd = Connection.CreateCommand();
        cmd.CommandText = "SET app.tenant_id = 'test-tenant-id'";
        await cmd.ExecuteNonQueryAsync();
    }

    public async Task DisposeAsync()
    {
        await Transaction.RollbackAsync();
        await Transaction.DisposeAsync();
        await Connection.DisposeAsync();
    }
}
```

### 2.3 Test Data Builders

```csharp
public sealed class ScheduleBuilder
{
    private Guid _id = Guid.NewGuid();
    private string _tenantId = "test-tenant";
    private string _name = "test-schedule";
    private bool _enabled = true;
    private string? _cronExpression = "0 * * * *";

    public ScheduleBuilder WithId(Guid id) { _id = id; return this; }
    public ScheduleBuilder WithTenant(string tenantId) { _tenantId = tenantId; return this; }
    public ScheduleBuilder WithName(string name) { _name = name; return this; }
    public ScheduleBuilder Enabled(bool enabled = true) { _enabled = enabled; return this; }
    public ScheduleBuilder WithCron(string? cron) { _cronExpression = cron; return this; }

    public Schedule Build() => new()
    {
        Id = _id,
        TenantId = _tenantId,
        Name = _name,
        Enabled = _enabled,
        CronExpression = _cronExpression,
        Timezone = "UTC",
        Mode = ScheduleMode.Scheduled,
        CreatedAt = DateTimeOffset.UtcNow,
        UpdatedAt = DateTimeOffset.UtcNow
    };
}
```

---

## 3. Unit Test Requirements

### 3.1 Repository CRUD Tests

Every repository implementation MUST have tests for:

```csharp
public class PostgresScheduleRepositoryTests : PostgresRepositoryTestBase
{
    private readonly PostgresScheduleRepository _repository;

    public PostgresScheduleRepositoryTests(PostgresTestFixture fixture)
        : base(fixture)
    {
        _repository = new PostgresScheduleRepository(/* ... */);
    }

    // CREATE
    [Fact]
    public async Task UpsertAsync_CreatesNewSchedule_WhenNotExists()
    {
        var schedule = new ScheduleBuilder().Build();

        await _repository.UpsertAsync(schedule, CancellationToken.None);

        var retrieved = await _repository.GetAsync(
            schedule.TenantId, schedule.Id.ToString(), CancellationToken.None);
        retrieved.Should().BeEquivalentTo(schedule);
    }

    // READ
    [Fact]
    public async Task GetAsync_ReturnsNull_WhenNotExists()
    {
        var result = await _repository.GetAsync(
            "tenant", Guid.NewGuid().ToString(), CancellationToken.None);

        result.Should().BeNull();
    }

    [Fact]
    public async Task GetAsync_ReturnsSchedule_WhenExists()
    {
        var schedule = new ScheduleBuilder().Build();
        await _repository.UpsertAsync(schedule, CancellationToken.None);

        var result = await _repository.GetAsync(
            schedule.TenantId, schedule.Id.ToString(), CancellationToken.None);

        result.Should().NotBeNull();
        result!.Id.Should().Be(schedule.Id);
    }

    // UPDATE
    [Fact]
    public async Task UpsertAsync_UpdatesExisting_WhenExists()
    {
        var schedule = new ScheduleBuilder().Build();
        await _repository.UpsertAsync(schedule, CancellationToken.None);

        schedule = schedule with { Name = "updated-name" };
        await _repository.UpsertAsync(schedule, CancellationToken.None);

        var retrieved = await _repository.GetAsync(
            schedule.TenantId, schedule.Id.ToString(), CancellationToken.None);
        retrieved!.Name.Should().Be("updated-name");
    }

    // DELETE
    [Fact]
    public async Task SoftDeleteAsync_SetsDeletedAt_WhenExists()
    {
        var schedule = new ScheduleBuilder().Build();
        await _repository.UpsertAsync(schedule, CancellationToken.None);

        var result = await _repository.SoftDeleteAsync(
            schedule.TenantId, schedule.Id.ToString(),
            "test-user", DateTimeOffset.UtcNow, CancellationToken.None);

        result.Should().BeTrue();
        var retrieved = await _repository.GetAsync(
            schedule.TenantId, schedule.Id.ToString(), CancellationToken.None);
        retrieved.Should().BeNull(); // Soft-deleted not returned
    }

    // LIST
    [Fact]
    public async Task ListAsync_ReturnsAllForTenant()
    {
        var schedule1 = new ScheduleBuilder().WithName("schedule-1").Build();
        var schedule2 = new ScheduleBuilder().WithName("schedule-2").Build();
        await _repository.UpsertAsync(schedule1, CancellationToken.None);
        await _repository.UpsertAsync(schedule2, CancellationToken.None);

        var results = await _repository.ListAsync(
            schedule1.TenantId, null, CancellationToken.None);

        results.Should().HaveCount(2);
    }
}
```

### 3.2 Tenant Isolation Tests

```csharp
public class TenantIsolationTests : PostgresRepositoryTestBase
{
    [Fact]
    public async Task GetAsync_DoesNotReturnOtherTenantData()
    {
        var tenant1Schedule = new ScheduleBuilder()
            .WithTenant("tenant-1")
            .WithName("tenant1-schedule")
            .Build();
        var tenant2Schedule = new ScheduleBuilder()
            .WithTenant("tenant-2")
            .WithName("tenant2-schedule")
            .Build();

        await _repository.UpsertAsync(tenant1Schedule, CancellationToken.None);
        await _repository.UpsertAsync(tenant2Schedule, CancellationToken.None);

        // Tenant 1 should not see Tenant 2's data
        var result = await _repository.GetAsync(
            "tenant-1", tenant2Schedule.Id.ToString(), CancellationToken.None);

        result.Should().BeNull();
    }

    [Fact]
    public async Task ListAsync_OnlyReturnsTenantData()
    {
        // Create schedules for two tenants
        for (int i = 0; i < 5; i++)
        {
            await _repository.UpsertAsync(
                new ScheduleBuilder().WithTenant("tenant-1").Build(),
                CancellationToken.None);
            await _repository.UpsertAsync(
                new ScheduleBuilder().WithTenant("tenant-2").Build(),
                CancellationToken.None);
        }

        var tenant1Results = await _repository.ListAsync(
            "tenant-1", null, CancellationToken.None);
        var tenant2Results = await _repository.ListAsync(
            "tenant-2", null, CancellationToken.None);

        tenant1Results.Should().HaveCount(5);
        tenant2Results.Should().HaveCount(5);
        tenant1Results.Should().OnlyContain(s => s.TenantId == "tenant-1");
        tenant2Results.Should().OnlyContain(s => s.TenantId == "tenant-2");
    }
}
```

### 3.3 Determinism Tests

```csharp
public class DeterminismTests : PostgresRepositoryTestBase
{
    [Fact]
    public async Task ListAsync_ReturnsDeterministicOrder()
    {
        // Insert multiple schedules with same created_at
        var baseTime = DateTimeOffset.UtcNow;
        var schedules = Enumerable.Range(0, 10)
            .Select(i => new ScheduleBuilder()
                .WithName($"schedule-{i}")
                .Build() with { CreatedAt = baseTime })
            .ToList();

        foreach (var schedule in schedules)
            await _repository.UpsertAsync(schedule, CancellationToken.None);

        // Multiple calls should return same order
        var results1 = await _repository.ListAsync("test-tenant", null, CancellationToken.None);
        var results2 = await _repository.ListAsync("test-tenant", null, CancellationToken.None);
        var results3 = await _repository.ListAsync("test-tenant", null, CancellationToken.None);

        results1.Select(s => s.Id).Should().Equal(results2.Select(s => s.Id));
        results2.Select(s => s.Id).Should().Equal(results3.Select(s => s.Id));
    }

    [Fact]
    public async Task JsonbSerialization_IsDeterministic()
    {
        var schedule = new ScheduleBuilder()
            .Build() with
            {
                Selection = new ScheduleSelector
                {
                    Tags = new[] { "z", "a", "m" },
                    Repositories = new[] { "repo-2", "repo-1" }
                }
            };

        await _repository.UpsertAsync(schedule, CancellationToken.None);

        // Retrieve and re-save multiple times
        for (int i = 0; i < 3; i++)
        {
            var retrieved = await _repository.GetAsync(
                schedule.TenantId, schedule.Id.ToString(), CancellationToken.None);
            await _repository.UpsertAsync(retrieved!, CancellationToken.None);
        }

        // Final retrieval should have identical JSONB
        var final = await _repository.GetAsync(
            schedule.TenantId, schedule.Id.ToString(), CancellationToken.None);

        // Arrays should be consistently ordered
        final!.Selection.Tags.Should().BeInAscendingOrder();
    }
}
```

---

## 4. Comparison Test Requirements

### 4.1 MongoDB vs PostgreSQL Comparison Framework

```csharp
public abstract class ComparisonTestBase<TEntity, TRepository>
    where TRepository : class
{
    protected readonly TRepository MongoRepository;
    protected readonly TRepository PostgresRepository;

    protected abstract Task<TEntity?> GetFromMongo(string tenantId, string id);
    protected abstract Task<TEntity?> GetFromPostgres(string tenantId, string id);
    protected abstract Task<IReadOnlyList<TEntity>> ListFromMongo(string tenantId);
    protected abstract Task<IReadOnlyList<TEntity>> ListFromPostgres(string tenantId);

    [Fact]
    public async Task Get_ReturnsSameEntity_FromBothBackends()
    {
        var entityId = GetTestEntityId();
        var tenantId = GetTestTenantId();

        var mongoResult = await GetFromMongo(tenantId, entityId);
        var postgresResult = await GetFromPostgres(tenantId, entityId);

        postgresResult.Should().BeEquivalentTo(mongoResult, options =>
            options.Excluding(e => e.Path.Contains("Id"))); // IDs may differ
    }

    [Fact]
    public async Task List_ReturnsSameEntities_FromBothBackends()
    {
        var tenantId = GetTestTenantId();

        var mongoResults = await ListFromMongo(tenantId);
        var postgresResults = await ListFromPostgres(tenantId);

        postgresResults.Should().BeEquivalentTo(mongoResults, options =>
            options
                .Excluding(e => e.Path.Contains("Id"))
                .WithStrictOrdering()); // Order must match
    }
}
```

### 4.2 Advisory Matching Comparison

```csharp
public class AdvisoryMatchingComparisonTests
{
    [Theory]
    [MemberData(nameof(GetSampleSboms))]
    public async Task VulnerabilityMatching_ProducesSameResults(string sbomPath)
    {
        var sbom = await LoadSbomAsync(sbomPath);

        // Configure Mongo backend
        var mongoConfig = CreateConfig("Mongo");
        var mongoScanner = CreateScanner(mongoConfig);
        var mongoFindings = await mongoScanner.ScanAsync(sbom);

        // Configure Postgres backend
        var postgresConfig = CreateConfig("Postgres");
        var postgresScanner = CreateScanner(postgresConfig);
        var postgresFindings = await postgresScanner.ScanAsync(sbom);

        // Compare findings
        postgresFindings.Should().BeEquivalentTo(mongoFindings, options =>
            options
                .WithStrictOrdering()
                .Using<DateTimeOffset>(ctx =>
                    ctx.Subject.Should().BeCloseTo(ctx.Expectation, TimeSpan.FromSeconds(1)))
                .WhenTypeIs<DateTimeOffset>());
    }

    public static IEnumerable<object[]> GetSampleSboms()
    {
        yield return new object[] { "testdata/sbom-alpine-3.18.json" };
        yield return new object[] { "testdata/sbom-debian-12.json" };
        yield return new object[] { "testdata/sbom-nodejs-app.json" };
        yield return new object[] { "testdata/sbom-python-app.json" };
    }
}
```

### 4.3 VEX Graph Comparison

```csharp
public class GraphRevisionComparisonTests
{
    [Theory]
    [MemberData(nameof(GetTestProjects))]
    public async Task GraphComputation_ProducesIdenticalRevisionId(string projectId)
    {
        // Compute graph with Mongo backend
        var mongoGraph = await ComputeGraphAsync(projectId, "Mongo");

        // Compute graph with Postgres backend
        var postgresGraph = await ComputeGraphAsync(projectId, "Postgres");

        // Revision ID MUST be identical (hash-stable)
        postgresGraph.RevisionId.Should().Be(mongoGraph.RevisionId);

        // Node and edge counts should match
        postgresGraph.NodeCount.Should().Be(mongoGraph.NodeCount);
        postgresGraph.EdgeCount.Should().Be(mongoGraph.EdgeCount);

        // VEX statements should match
        var mongoStatements = await GetStatementsAsync(projectId, "Mongo");
        var postgresStatements = await GetStatementsAsync(projectId, "Postgres");

        postgresStatements.Should().BeEquivalentTo(mongoStatements, options =>
            options
                .Excluding(s => s.Id)
                .WithStrictOrdering());
    }
}
```

---

## 5. Performance Test Requirements

### 5.1 Benchmark Framework

```csharp
[MemoryDiagnoser]
[SimpleJob(RuntimeMoniker.Net80)]
public class RepositoryBenchmarks
{
    private IScheduleRepository _mongoRepository = null!;
    private IScheduleRepository _postgresRepository = null!;
    private string _tenantId = null!;

    [GlobalSetup]
    public async Task Setup()
    {
        // Initialize both repositories
        _mongoRepository = await CreateMongoRepositoryAsync();
        _postgresRepository = await CreatePostgresRepositoryAsync();
        _tenantId = await SeedTestDataAsync();
    }

    [Benchmark(Baseline = true)]
    public async Task<Schedule?> Mongo_GetById()
    {
        return await _mongoRepository.GetAsync(_tenantId, _testScheduleId, CancellationToken.None);
    }

    [Benchmark]
    public async Task<Schedule?> Postgres_GetById()
    {
        return await _postgresRepository.GetAsync(_tenantId, _testScheduleId, CancellationToken.None);
    }

    [Benchmark(Baseline = true)]
    public async Task<IReadOnlyList<Schedule>> Mongo_List100()
    {
        return await _mongoRepository.ListAsync(_tenantId,
            new QueryOptions { PageSize = 100 }, CancellationToken.None);
    }

    [Benchmark]
    public async Task<IReadOnlyList<Schedule>> Postgres_List100()
    {
        return await _postgresRepository.ListAsync(_tenantId,
            new QueryOptions { PageSize = 100 }, CancellationToken.None);
    }
}
```

### 5.2 Performance Acceptance Criteria

| Operation | Mongo Baseline | Postgres Target | Maximum Acceptable |
|-----------|----------------|-----------------|-------------------|
| Get by ID | X ms | ≤ X ms | ≤ 1.5X ms |
| List (100 items) | Y ms | ≤ Y ms | ≤ 1.5Y ms |
| Insert | Z ms | ≤ Z ms | ≤ 2Z ms |
| Update | W ms | ≤ W ms | ≤ 2W ms |
| Complex query | V ms | ≤ V ms | ≤ 2V ms |

### 5.3 Load Test Scenarios

```yaml
# k6 load test configuration
scenarios:
  constant_load:
    executor: constant-arrival-rate
    rate: 100
    timeUnit: 1s
    duration: 5m
    preAllocatedVUs: 50
    maxVUs: 100

  spike_test:
    executor: ramping-arrival-rate
    startRate: 10
    timeUnit: 1s
    stages:
      - duration: 1m
        target: 10
      - duration: 1m
        target: 100
      - duration: 2m
        target: 100
      - duration: 1m
        target: 10

thresholds:
  http_req_duration:
    - p(95) < 200  # 95th percentile under 200ms
    - p(99) < 500  # 99th percentile under 500ms
  http_req_failed:
    - rate < 0.01  # Error rate under 1%
```

---

## 6. Data Integrity Verification

### 6.1 Record Count Verification

```csharp
public class DataIntegrityVerifier
{
    public async Task<VerificationResult> VerifyCountsAsync(string module)
    {
        var results = new Dictionary<string, (long mongo, long postgres)>();

        foreach (var collection in GetCollections(module))
        {
            var mongoCount = await _mongoDb.GetCollection<BsonDocument>(collection)
                .CountDocumentsAsync(FilterDefinition<BsonDocument>.Empty);

            var postgresCount = await GetPostgresCountAsync(collection);

            results[collection] = (mongoCount, postgresCount);
        }

        return new VerificationResult
        {
            Module = module,
            Counts = results,
            AllMatch = results.All(r => r.Value.mongo == r.Value.postgres)
        };
    }
}
```

### 6.2 Checksum Verification

```csharp
public class ChecksumVerifier
{
    public async Task<bool> VerifyAdvisoryChecksumAsync(string advisoryKey)
    {
        var mongoAdvisory = await _mongoAdvisoryRepo.GetAsync(advisoryKey);
        var postgresAdvisory = await _postgresAdvisoryRepo.GetAsync(advisoryKey);

        if (mongoAdvisory is null || postgresAdvisory is null)
            return mongoAdvisory is null && postgresAdvisory is null;

        var mongoChecksum = ComputeChecksum(mongoAdvisory);
        var postgresChecksum = ComputeChecksum(postgresAdvisory);

        return mongoChecksum == postgresChecksum;
    }

    private string ComputeChecksum(Advisory advisory)
    {
        // Serialize to canonical JSON and hash
        var json = JsonSerializer.Serialize(advisory, new JsonSerializerOptions
        {
            PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
            WriteIndented = false,
            DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull
        });

        using var sha256 = SHA256.Create();
        var hash = sha256.ComputeHash(Encoding.UTF8.GetBytes(json));
        return Convert.ToHexString(hash);
    }
}
```

### 6.3 Referential Integrity Verification

```csharp
public class ReferentialIntegrityTests
{
    [Fact]
    public async Task AllForeignKeys_ReferenceExistingRecords()
    {
        await using var connection = await _dataSource.OpenConnectionAsync();
        await using var cmd = connection.CreateCommand();

        // Check for orphaned references
        cmd.CommandText = """
            SELECT 'advisory_aliases' as table_name, COUNT(*) as orphan_count
            FROM vuln.advisory_aliases a
            LEFT JOIN vuln.advisories adv ON a.advisory_id = adv.id
            WHERE adv.id IS NULL

            UNION ALL

            SELECT 'advisory_cvss', COUNT(*)
            FROM vuln.advisory_cvss c
            LEFT JOIN vuln.advisories adv ON c.advisory_id = adv.id
            WHERE adv.id IS NULL

            -- Add more tables...
            """;

        await using var reader = await cmd.ExecuteReaderAsync();
        while (await reader.ReadAsync())
        {
            var tableName = reader.GetString(0);
            var orphanCount = reader.GetInt64(1);
            orphanCount.Should().Be(0, $"Table {tableName} has orphaned references");
        }
    }
}
```

---

## 7. Production Verification

### 7.1 Dual-Write Monitoring

```csharp
public class DualWriteMonitor
{
    private readonly IMetrics _metrics;

    public async Task RecordWriteAsync(
        string module,
        string operation,
        bool mongoSuccess,
        bool postgresSuccess,
        TimeSpan mongoDuration,
        TimeSpan postgresDuration)
    {
        _metrics.Counter("dual_write_total", new[]
        {
            ("module", module),
            ("operation", operation),
            ("mongo_success", mongoSuccess.ToString()),
            ("postgres_success", postgresSuccess.ToString())
        }).Inc();

        _metrics.Histogram("dual_write_duration_ms", new[]
        {
            ("module", module),
            ("operation", operation),
            ("backend", "mongo")
        }).Observe(mongoDuration.TotalMilliseconds);

        _metrics.Histogram("dual_write_duration_ms", new[]
        {
            ("module", module),
            ("operation", operation),
            ("backend", "postgres")
        }).Observe(postgresDuration.TotalMilliseconds);

        if (mongoSuccess != postgresSuccess)
        {
            _metrics.Counter("dual_write_inconsistency", new[]
            {
                ("module", module),
                ("operation", operation)
            }).Inc();

            _logger.LogWarning(
                "Dual-write inconsistency: {Module}/{Operation} - Mongo: {Mongo}, Postgres: {Postgres}",
                module, operation, mongoSuccess, postgresSuccess);
        }
    }
}
```

### 7.2 Read Comparison Sampling

```csharp
public class ReadComparisonSampler : BackgroundService
{
    private readonly IOptions<SamplingOptions> _options;
    private readonly Random _random = new();

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        while (!stoppingToken.IsCancellationRequested)
        {
            if (_random.NextDouble() < _options.Value.SampleRate) // e.g., 1%
            {
                await CompareRandomRecordAsync(stoppingToken);
            }

            await Task.Delay(_options.Value.Interval, stoppingToken);
        }
    }

    private async Task CompareRandomRecordAsync(CancellationToken ct)
    {
        var entityId = await GetRandomEntityIdAsync(ct);

        var mongoEntity = await _mongoRepo.GetAsync(entityId, ct);
        var postgresEntity = await _postgresRepo.GetAsync(entityId, ct);

        if (!AreEquivalent(mongoEntity, postgresEntity))
        {
            _logger.LogError(
                "Read comparison mismatch for entity {EntityId}",
                entityId);

            _metrics.Counter("read_comparison_mismatch").Inc();
        }
    }
}
```

### 7.3 Rollback Verification

```csharp
public class RollbackVerificationTests
{
    [Fact]
    public async Task Rollback_RestoresMongoAsSource_WhenPostgresFails()
    {
        // Simulate Postgres failure
        await _postgresDataSource.DisposeAsync();

        // Verify system falls back to Mongo
        var config = _configuration.GetSection("Persistence");
        config["Scheduler"] = "Mongo"; // Simulate config change

        // Operations should continue working
        var schedule = await _scheduleRepository.GetAsync(
            "tenant", "schedule-id", CancellationToken.None);

        schedule.Should().NotBeNull();
    }
}
```

---

## 8. Module-Specific Verification

### 8.1 Authority Verification

| Test | Description | Pass Criteria |
|------|-------------|---------------|
| User CRUD | Create, read, update, delete users | All operations succeed |
| Role assignment | Assign/revoke roles | Roles correctly applied |
| Token issuance | Issue OAuth tokens | Tokens valid and verifiable |
| Token verification | Verify issued tokens | Verification succeeds |
| Login tracking | Record login attempts | Attempts logged correctly |
| License validation | Check license validity | Same result both backends |

### 8.2 Scheduler Verification

| Test | Description | Pass Criteria |
|------|-------------|---------------|
| Schedule CRUD | All CRUD operations | Data integrity preserved |
| Trigger calculation | Next fire time calculation | Identical results |
| Run history | Run creation and completion | Correct state transitions |
| Impact snapshots | Finding aggregation | Same counts and severity |
| Worker registration | Worker heartbeats | Consistent status |

### 8.3 Vulnerability Verification

| Test | Description | Pass Criteria |
|------|-------------|---------------|
| Advisory ingest | Import from feed | All advisories imported |
| Alias resolution | CVE → Advisory lookup | Same advisory returned |
| CVSS lookup | Get CVSS scores | Identical scores |
| Affected package match | PURL matching | Same vulnerabilities found |
| KEV flag lookup | Check KEV status | Correct flag status |

### 8.4 VEX Verification

| Test | Description | Pass Criteria |
|------|-------------|---------------|
| Graph revision | Compute revision ID | Identical revision IDs |
| Node/edge counts | Graph structure | Same counts |
| VEX statements | Status determination | Same statuses |
| Consensus computation | Aggregate signals | Same consensus |
| Evidence manifest | Merkle root | Identical roots |

---

## 9. Verification Checklist

### Per-Module Checklist

- [ ] All unit tests pass with PostgreSQL
- [ ] Tenant isolation tests pass
- [ ] Determinism tests pass
- [ ] Performance benchmarks within tolerance
- [ ] Record counts match between MongoDB and PostgreSQL
- [ ] Checksum verification passes for sample data
- [ ] Referential integrity verified
- [ ] Comparison tests pass for all scenarios
- [ ] Load tests pass with acceptable metrics

### Pre-Production Checklist

- [ ] Dual-write monitoring in place
- [ ] Read comparison sampling enabled
- [ ] Rollback procedure tested
- [ ] Performance baselines established
- [ ] Alert thresholds configured
- [ ] Runbook documented

### Post-Switch Checklist

- [x] Dual-write window closed; no inconsistencies observed (retired post-cutover)
- [ ] Read comparison sampling shows 100% match
- [ ] Performance within acceptable range
- [ ] No data integrity alerts
- [ ] MongoDB reads disabled
- [ ] MongoDB backups archived

> Note: Authority and Notify have completed cutover and verification; remaining modules pending.

---

## 10. Reporting

### 10.1 Verification Report Template

```markdown
# Database Conversion Verification Report

## Module: [Module Name]
## Date: [YYYY-MM-DD]
## Status: [PASS/FAIL]

### Summary
- Total Tests: X
- Passed: Y
- Failed: Z

### Unit Tests
| Category | Passed | Failed | Notes |
|----------|--------|--------|-------|
| CRUD     |        |        |       |
| Isolation|        |        |       |
| Determinism |     |        |       |

### Comparison Tests
| Test | Status | Notes |
|------|--------|-------|
|      |        |       |

### Performance
| Operation | Mongo | Postgres | Diff |
|-----------|-------|----------|------|
|           |       |          |      |

### Data Integrity
- Record count match: [YES/NO]
- Checksum verification: [PASS/FAIL]
- Referential integrity: [PASS/FAIL]

### Sign-off
- [ ] QA Engineer
- [ ] Tech Lead
- [ ] Product Owner
```

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*Document Version: 1.0.0*
*Last Updated: 2025-11-28*