feat: ICMP Fallback and Outage classifaction

ThingConnect.Pulse.Server/Data/Entities.cs

@@ -1,9 +1,27 @@
-// ThingConnect Pulse - EF Core Entities (v1)
+// ThingConnect Pulse - EF Core Entities (v2)
+// Updated for ICMP Fallback + Outage Classification
 namespace ThingConnect.Pulse.Server.Data;
 
 public enum ProbeType { icmp, tcp, http }
 public enum UpDown { up, down }
 
+/// <summary>
+/// Status classification for failed probe analysis.
+/// </summary>
+public enum Classification
+{
+    None = -1, // Explicitly healthy, no outage detected
+    Unknown = 0, // Not enough information to classify
+    Network = 1, // Host unreachable (ICMP + service fail)
+    Service = 2, // Service down, host reachable via ICMP
+    Intermittent = 3, // Flapping / unstable
+    Performance = 4, // RTT above threshold
+    PartialService = 5, // HTTP error, TCP works
+    DnsResolution = 6, // DNS fails, IP works
+    Congestion = 7, // Correlated latency
+    Maintenance = 8 // Planned downtime
+}
+
 public record GroupVm(string Id, string Name, string? ParentId, string? Color);
 public record EndpointVm(Guid Id, string Name, GroupVm Group, ProbeType Type, string Host,
                          int? Port, string? HttpPath, string? HttpMatch,
@@ -50,6 +68,13 @@ public sealed class CheckResultRaw
     public UpDown Status { get; set; }
     public double? RttMs { get; set; }
     public string? Error { get; set; }
+
+    // 🔹 New fields for fallback probe
+    public bool? FallbackAttempted { get; set; }
+    public UpDown? FallbackStatus { get; set; }
+    public double? FallbackRttMs { get; set; }
+    public string? FallbackError { get; set; }
+    public Classification? Classification { get; set; }
 }
 
 public sealed class Outage
@@ -61,6 +86,7 @@ public sealed class Outage
     public long? EndedTs { get; set; }
     public int? DurationSeconds { get; set; }
     public string? LastError { get; set; }
+    public Classification? Classification { get; set; }
 
     /// <summary>
     /// Gets or sets timestamp when monitoring was lost during this outage (service downtime).

ThingConnect.Pulse.Server/Data/PulseDbContext.cs

@@ -65,6 +65,17 @@ protected override void OnModelCreating(ModelBuilder b)
             e.HasKey(x => x.Id);
             e.Property(x => x.Status).HasConversion<string>().IsRequired();
             e.Property(x => x.RttMs).HasColumnType("double precision");
+
+            // New Fallback fields
+            e.Property(x => x.FallbackAttempted);
+            e.Property(x => x.FallbackStatus).HasConversion<string>();
+            e.Property(x => x.FallbackRttMs).HasColumnType("double precision");
+            e.Property(x => x.FallbackError);
+
+            // Classification field
+            e.Property(x => x.Classification)
+            .HasConversion<int?>();
+
             e.HasIndex(x => new { x.EndpointId, x.Ts });
         });
 
@@ -74,6 +85,10 @@ protected override void OnModelCreating(ModelBuilder b)
             e.HasKey(x => x.Id);
             e.HasIndex(x => new { x.EndpointId, x.StartedTs });
             e.HasIndex(x => new { x.EndpointId, x.EndedTs });
+
+            // New Classification field
+            e.Property(x => x.Classification)
+            .HasConversion<int?>();
         });
 
         b.Entity<Rollup15m>(e =>