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src/Policy/StellaOps.Policy.Engine/Scoring/RiskScoringJobStore.cs

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+using System.Collections.Concurrent;
+
+namespace StellaOps.Policy.Engine.Scoring;
+
+/// <summary>
+/// Store for risk scoring jobs.
+/// </summary>
+public interface IRiskScoringJobStore
+{
+    Task SaveAsync(RiskScoringJob job, CancellationToken cancellationToken = default);
+    Task<RiskScoringJob?> GetAsync(string jobId, CancellationToken cancellationToken = default);
+    Task<IReadOnlyList<RiskScoringJob>> ListByStatusAsync(RiskScoringJobStatus status, int limit = 100, CancellationToken cancellationToken = default);
+    Task<IReadOnlyList<RiskScoringJob>> ListByTenantAsync(string tenantId, int limit = 100, CancellationToken cancellationToken = default);
+    Task UpdateStatusAsync(string jobId, RiskScoringJobStatus status, string? errorMessage = null, CancellationToken cancellationToken = default);
+    Task<RiskScoringJob?> DequeueNextAsync(CancellationToken cancellationToken = default);
+}
+
+/// <summary>
+/// In-memory implementation of risk scoring job store.
+/// </summary>
+public sealed class InMemoryRiskScoringJobStore : IRiskScoringJobStore
+{
+    private readonly ConcurrentDictionary<string, RiskScoringJob> _jobs = new();
+    private readonly TimeProvider _timeProvider;
+
+    public InMemoryRiskScoringJobStore(TimeProvider timeProvider)
+    {
+        _timeProvider = timeProvider ?? throw new ArgumentNullException(nameof(timeProvider));
+    }
+
+    public Task SaveAsync(RiskScoringJob job, CancellationToken cancellationToken = default)
+    {
+        _jobs[job.JobId] = job;
+        return Task.CompletedTask;
+    }
+
+    public Task<RiskScoringJob?> GetAsync(string jobId, CancellationToken cancellationToken = default)
+    {
+        _jobs.TryGetValue(jobId, out var job);
+        return Task.FromResult(job);
+    }
+
+    public Task<IReadOnlyList<RiskScoringJob>> ListByStatusAsync(RiskScoringJobStatus status, int limit = 100, CancellationToken cancellationToken = default)
+    {
+        var jobs = _jobs.Values
+            .Where(j => j.Status == status)
+            .OrderBy(j => j.RequestedAt)
+            .Take(limit)
+            .ToList()
+            .AsReadOnly();
+
+        return Task.FromResult<IReadOnlyList<RiskScoringJob>>(jobs);
+    }
+
+    public Task<IReadOnlyList<RiskScoringJob>> ListByTenantAsync(string tenantId, int limit = 100, CancellationToken cancellationToken = default)
+    {
+        var jobs = _jobs.Values
+            .Where(j => j.TenantId.Equals(tenantId, StringComparison.OrdinalIgnoreCase))
+            .OrderByDescending(j => j.RequestedAt)
+            .Take(limit)
+            .ToList()
+            .AsReadOnly();
+
+        return Task.FromResult<IReadOnlyList<RiskScoringJob>>(jobs);
+    }
+
+    public Task UpdateStatusAsync(string jobId, RiskScoringJobStatus status, string? errorMessage = null, CancellationToken cancellationToken = default)
+    {
+        if (_jobs.TryGetValue(jobId, out var job))
+        {
+            var now = _timeProvider.GetUtcNow();
+            var updated = job with
+            {
+                Status = status,
+                StartedAt = status == RiskScoringJobStatus.Running ? now : job.StartedAt,
+                CompletedAt = status is RiskScoringJobStatus.Completed or RiskScoringJobStatus.Failed or RiskScoringJobStatus.Cancelled ? now : job.CompletedAt,
+                ErrorMessage = errorMessage ?? job.ErrorMessage
+            };
+            _jobs[jobId] = updated;
+        }
+
+        return Task.CompletedTask;
+    }
+
+    public Task<RiskScoringJob?> DequeueNextAsync(CancellationToken cancellationToken = default)
+    {
+        var next = _jobs.Values
+            .Where(j => j.Status == RiskScoringJobStatus.Queued)
+            .OrderByDescending(j => j.Priority)
+            .ThenBy(j => j.RequestedAt)
+            .FirstOrDefault();
+
+        if (next != null)
+        {
+            var running = next with
+            {
+                Status = RiskScoringJobStatus.Running,
+                StartedAt = _timeProvider.GetUtcNow()
+            };
+            _jobs[next.JobId] = running;
+            return Task.FromResult<RiskScoringJob?>(running);
+        }
+
+        return Task.FromResult<RiskScoringJob?>(null);
+    }
+}

src/Policy/StellaOps.Policy.Engine/Scoring/RiskScoringModels.cs

@@ -0,0 +1,131 @@
+using System.Text.Json.Serialization;
+
+namespace StellaOps.Policy.Engine.Scoring;
+
+/// <summary>
+/// Event indicating a finding has been created or updated.
+/// </summary>
+public sealed record FindingChangedEvent(
+    [property: JsonPropertyName("finding_id")] string FindingId,
+    [property: JsonPropertyName("tenant_id")] string TenantId,
+    [property: JsonPropertyName("context_id")] string ContextId,
+    [property: JsonPropertyName("component_purl")] string ComponentPurl,
+    [property: JsonPropertyName("advisory_id")] string AdvisoryId,
+    [property: JsonPropertyName("change_type")] FindingChangeType ChangeType,
+    [property: JsonPropertyName("timestamp")] DateTimeOffset Timestamp,
+    [property: JsonPropertyName("correlation_id")] string? CorrelationId = null);
+
+/// <summary>
+/// Type of finding change.
+/// </summary>
+[JsonConverter(typeof(JsonStringEnumConverter<FindingChangeType>))]
+public enum FindingChangeType
+{
+    [JsonPropertyName("created")]
+    Created,
+
+    [JsonPropertyName("updated")]
+    Updated,
+
+    [JsonPropertyName("enriched")]
+    Enriched,
+
+    [JsonPropertyName("vex_applied")]
+    VexApplied
+}
+
+/// <summary>
+/// Request to create a risk scoring job.
+/// </summary>
+public sealed record RiskScoringJobRequest(
+    [property: JsonPropertyName("tenant_id")] string TenantId,
+    [property: JsonPropertyName("context_id")] string ContextId,
+    [property: JsonPropertyName("profile_id")] string ProfileId,
+    [property: JsonPropertyName("findings")] IReadOnlyList<RiskScoringFinding> Findings,
+    [property: JsonPropertyName("priority")] RiskScoringPriority Priority = RiskScoringPriority.Normal,
+    [property: JsonPropertyName("correlation_id")] string? CorrelationId = null,
+    [property: JsonPropertyName("requested_at")] DateTimeOffset? RequestedAt = null);
+
+/// <summary>
+/// A finding to score.
+/// </summary>
+public sealed record RiskScoringFinding(
+    [property: JsonPropertyName("finding_id")] string FindingId,
+    [property: JsonPropertyName("component_purl")] string ComponentPurl,
+    [property: JsonPropertyName("advisory_id")] string AdvisoryId,
+    [property: JsonPropertyName("trigger")] FindingChangeType Trigger);
+
+/// <summary>
+/// Priority for risk scoring jobs.
+/// </summary>
+[JsonConverter(typeof(JsonStringEnumConverter<RiskScoringPriority>))]
+public enum RiskScoringPriority
+{
+    [JsonPropertyName("low")]
+    Low,
+
+    [JsonPropertyName("normal")]
+    Normal,
+
+    [JsonPropertyName("high")]
+    High,
+
+    [JsonPropertyName("emergency")]
+    Emergency
+}
+
+/// <summary>
+/// A queued or completed risk scoring job.
+/// </summary>
+public sealed record RiskScoringJob(
+    [property: JsonPropertyName("job_id")] string JobId,
+    [property: JsonPropertyName("tenant_id")] string TenantId,
+    [property: JsonPropertyName("context_id")] string ContextId,
+    [property: JsonPropertyName("profile_id")] string ProfileId,
+    [property: JsonPropertyName("profile_hash")] string ProfileHash,
+    [property: JsonPropertyName("findings")] IReadOnlyList<RiskScoringFinding> Findings,
+    [property: JsonPropertyName("priority")] RiskScoringPriority Priority,
+    [property: JsonPropertyName("status")] RiskScoringJobStatus Status,
+    [property: JsonPropertyName("requested_at")] DateTimeOffset RequestedAt,
+    [property: JsonPropertyName("started_at")] DateTimeOffset? StartedAt = null,
+    [property: JsonPropertyName("completed_at")] DateTimeOffset? CompletedAt = null,
+    [property: JsonPropertyName("correlation_id")] string? CorrelationId = null,
+    [property: JsonPropertyName("error_message")] string? ErrorMessage = null);
+
+/// <summary>
+/// Status of a risk scoring job.
+/// </summary>
+[JsonConverter(typeof(JsonStringEnumConverter<RiskScoringJobStatus>))]
+public enum RiskScoringJobStatus
+{
+    [JsonPropertyName("queued")]
+    Queued,
+
+    [JsonPropertyName("running")]
+    Running,
+
+    [JsonPropertyName("completed")]
+    Completed,
+
+    [JsonPropertyName("failed")]
+    Failed,
+
+    [JsonPropertyName("cancelled")]
+    Cancelled
+}
+
+/// <summary>
+/// Result of scoring a single finding.
+/// </summary>
+public sealed record RiskScoringResult(
+    [property: JsonPropertyName("finding_id")] string FindingId,
+    [property: JsonPropertyName("profile_id")] string ProfileId,
+    [property: JsonPropertyName("profile_version")] string ProfileVersion,
+    [property: JsonPropertyName("raw_score")] double RawScore,
+    [property: JsonPropertyName("normalized_score")] double NormalizedScore,
+    [property: JsonPropertyName("severity")] string Severity,
+    [property: JsonPropertyName("signal_values")] IReadOnlyDictionary<string, object?> SignalValues,
+    [property: JsonPropertyName("signal_contributions")] IReadOnlyDictionary<string, double> SignalContributions,
+    [property: JsonPropertyName("override_applied")] string? OverrideApplied,
+    [property: JsonPropertyName("override_reason")] string? OverrideReason,
+    [property: JsonPropertyName("scored_at")] DateTimeOffset ScoredAt);

src/Policy/StellaOps.Policy.Engine/Scoring/RiskScoringTriggerService.cs

@@ -0,0 +1,265 @@
+using System.Collections.Concurrent;
+using System.Security.Cryptography;
+using System.Text;
+using Microsoft.Extensions.Logging;
+using StellaOps.Policy.Engine.Services;
+using StellaOps.Policy.Engine.Telemetry;
+using StellaOps.Policy.RiskProfile.Hashing;
+
+namespace StellaOps.Policy.Engine.Scoring;
+
+/// <summary>
+/// Service for triggering risk scoring jobs when findings change.
+/// </summary>
+public sealed class RiskScoringTriggerService
+{
+    private readonly ILogger<RiskScoringTriggerService> _logger;
+    private readonly TimeProvider _timeProvider;
+    private readonly RiskProfileConfigurationService _profileService;
+    private readonly IRiskScoringJobStore _jobStore;
+    private readonly RiskProfileHasher _hasher;
+    private readonly ConcurrentDictionary<string, DateTimeOffset> _recentTriggers;
+    private readonly TimeSpan _deduplicationWindow;
+
+    public RiskScoringTriggerService(
+        ILogger<RiskScoringTriggerService> logger,
+        TimeProvider timeProvider,
+        RiskProfileConfigurationService profileService,
+        IRiskScoringJobStore jobStore)
+    {
+        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        _timeProvider = timeProvider ?? throw new ArgumentNullException(nameof(timeProvider));
+        _profileService = profileService ?? throw new ArgumentNullException(nameof(profileService));
+        _jobStore = jobStore ?? throw new ArgumentNullException(nameof(jobStore));
+        _hasher = new RiskProfileHasher();
+        _recentTriggers = new ConcurrentDictionary<string, DateTimeOffset>();
+        _deduplicationWindow = TimeSpan.FromMinutes(5);
+    }
+
+    /// <summary>
+    /// Handles a finding changed event and creates a scoring job if appropriate.
+    /// </summary>
+    /// <param name="evt">The finding changed event.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The created job, or null if skipped.</returns>
+    public async Task<RiskScoringJob?> HandleFindingChangedAsync(
+        FindingChangedEvent evt,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(evt);
+
+        using var activity = PolicyEngineTelemetry.ActivitySource.StartActivity("risk_scoring.trigger");
+        activity?.SetTag("finding.id", evt.FindingId);
+        activity?.SetTag("change_type", evt.ChangeType.ToString());
+
+        if (!_profileService.IsEnabled)
+        {
+            _logger.LogDebug("Risk profile integration disabled; skipping scoring for {FindingId}", evt.FindingId);
+            return null;
+        }
+
+        var triggerKey = BuildTriggerKey(evt);
+        if (IsRecentlyTriggered(triggerKey))
+        {
+            _logger.LogDebug("Skipping duplicate trigger for {FindingId} within deduplication window", evt.FindingId);
+            PolicyEngineTelemetry.RiskScoringTriggersSkipped.Add(1);
+            return null;
+        }
+
+        var request = new RiskScoringJobRequest(
+            TenantId: evt.TenantId,
+            ContextId: evt.ContextId,
+            ProfileId: _profileService.DefaultProfileId,
+            Findings: new[]
+            {
+                new RiskScoringFinding(
+                    evt.FindingId,
+                    evt.ComponentPurl,
+                    evt.AdvisoryId,
+                    evt.ChangeType)
+            },
+            Priority: DeterminePriority(evt.ChangeType),
+            CorrelationId: evt.CorrelationId,
+            RequestedAt: evt.Timestamp);
+
+        var job = await CreateJobAsync(request, cancellationToken).ConfigureAwait(false);
+
+        RecordTrigger(triggerKey);
+        PolicyEngineTelemetry.RiskScoringJobsCreated.Add(1);
+
+        _logger.LogInformation(
+            "Created risk scoring job {JobId} for finding {FindingId} (trigger: {ChangeType})",
+            job.JobId, evt.FindingId, evt.ChangeType);
+
+        return job;
+    }
+
+    /// <summary>
+    /// Handles multiple finding changed events in batch.
+    /// </summary>
+    /// <param name="events">The finding changed events.</param>
+    /// <param name="cancellationToken">Cancellation token.</param>
+    /// <returns>The created job, or null if all events were skipped.</returns>
+    public async Task<RiskScoringJob?> HandleFindingsBatchAsync(
+        IReadOnlyList<FindingChangedEvent> events,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(events);
+
+        if (events.Count == 0)
+        {
+            return null;
+        }
+
+        if (!_profileService.IsEnabled)
+        {
+            _logger.LogDebug("Risk profile integration disabled; skipping batch scoring");
+            return null;
+        }
+
+        var uniqueEvents = events
+            .Where(e => !IsRecentlyTriggered(BuildTriggerKey(e)))
+            .GroupBy(e => e.FindingId)
+            .Select(g => g.OrderByDescending(e => e.Timestamp).First())
+            .ToList();
+
+        if (uniqueEvents.Count == 0)
+        {
+            _logger.LogDebug("All events in batch were duplicates; skipping");
+            return null;
+        }
+
+        var firstEvent = uniqueEvents[0];
+        var highestPriority = uniqueEvents.Select(e => DeterminePriority(e.ChangeType)).Max();
+
+        var request = new RiskScoringJobRequest(
+            TenantId: firstEvent.TenantId,
+            ContextId: firstEvent.ContextId,
+            ProfileId: _profileService.DefaultProfileId,
+            Findings: uniqueEvents.Select(e => new RiskScoringFinding(
+                e.FindingId,
+                e.ComponentPurl,
+                e.AdvisoryId,
+                e.ChangeType)).ToList(),
+            Priority: highestPriority,
+            CorrelationId: firstEvent.CorrelationId,
+            RequestedAt: _timeProvider.GetUtcNow());
+
+        var job = await CreateJobAsync(request, cancellationToken).ConfigureAwait(false);
+
+        foreach (var evt in uniqueEvents)
+        {
+            RecordTrigger(BuildTriggerKey(evt));
+        }
+
+        PolicyEngineTelemetry.RiskScoringJobsCreated.Add(1);
+
+        _logger.LogInformation(
+            "Created batch risk scoring job {JobId} for {FindingCount} findings",
+            job.JobId, uniqueEvents.Count);
+
+        return job;
+    }
+
+    /// <summary>
+    /// Creates a risk scoring job from a request.
+    /// </summary>
+    public async Task<RiskScoringJob> CreateJobAsync(
+        RiskScoringJobRequest request,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+
+        var profile = _profileService.GetProfile(request.ProfileId);
+        if (profile == null)
+        {
+            throw new InvalidOperationException($"Risk profile '{request.ProfileId}' not found.");
+        }
+
+        var profileHash = _hasher.ComputeHash(profile);
+        var requestedAt = request.RequestedAt ?? _timeProvider.GetUtcNow();
+        var jobId = GenerateJobId(request.TenantId, request.ContextId, requestedAt);
+
+        var job = new RiskScoringJob(
+            JobId: jobId,
+            TenantId: request.TenantId,
+            ContextId: request.ContextId,
+            ProfileId: request.ProfileId,
+            ProfileHash: profileHash,
+            Findings: request.Findings,
+            Priority: request.Priority,
+            Status: RiskScoringJobStatus.Queued,
+            RequestedAt: requestedAt,
+            CorrelationId: request.CorrelationId);
+
+        await _jobStore.SaveAsync(job, cancellationToken).ConfigureAwait(false);
+
+        return job;
+    }
+
+    /// <summary>
+    /// Gets the current queue depth.
+    /// </summary>
+    public async Task<int> GetQueueDepthAsync(CancellationToken cancellationToken = default)
+    {
+        var queued = await _jobStore.ListByStatusAsync(RiskScoringJobStatus.Queued, limit: 10000, cancellationToken).ConfigureAwait(false);
+        return queued.Count;
+    }
+
+    private static RiskScoringPriority DeterminePriority(FindingChangeType changeType)
+    {
+        return changeType switch
+        {
+            FindingChangeType.Created => RiskScoringPriority.High,
+            FindingChangeType.Enriched => RiskScoringPriority.High,
+            FindingChangeType.VexApplied => RiskScoringPriority.High,
+            FindingChangeType.Updated => RiskScoringPriority.Normal,
+            _ => RiskScoringPriority.Normal
+        };
+    }
+
+    private static string BuildTriggerKey(FindingChangedEvent evt)
+    {
+        return $"{evt.TenantId}|{evt.ContextId}|{evt.FindingId}|{evt.ChangeType}";
+    }
+
+    private bool IsRecentlyTriggered(string key)
+    {
+        if (_recentTriggers.TryGetValue(key, out var timestamp))
+        {
+            var elapsed = _timeProvider.GetUtcNow() - timestamp;
+            return elapsed < _deduplicationWindow;
+        }
+
+        return false;
+    }
+
+    private void RecordTrigger(string key)
+    {
+        var now = _timeProvider.GetUtcNow();
+        _recentTriggers[key] = now;
+
+        CleanupOldTriggers(now);
+    }
+
+    private void CleanupOldTriggers(DateTimeOffset now)
+    {
+        var threshold = now - _deduplicationWindow * 2;
+        var keysToRemove = _recentTriggers
+            .Where(kvp => kvp.Value < threshold)
+            .Select(kvp => kvp.Key)
+            .ToList();
+
+        foreach (var key in keysToRemove)
+        {
+            _recentTriggers.TryRemove(key, out _);
+        }
+    }
+
+    private static string GenerateJobId(string tenantId, string contextId, DateTimeOffset timestamp)
+    {
+        var seed = $"{tenantId}|{contextId}|{timestamp:O}|{Guid.NewGuid()}";
+        var hash = SHA256.HashData(Encoding.UTF8.GetBytes(seed));
+        return $"rsj-{Convert.ToHexStringLower(hash)[..16]}";
+    }
+}