0.2.0: log kills, bomb plants and defuses as they happen; leave warmup out of match stats

Ops.cs

@@ -16,6 +16,7 @@ namespace PlaytimeHistory;
 [JsonDerivedType(typeof(SegmentClose), "segment_close")]
 [JsonDerivedType(typeof(Heartbeat), "heartbeat")]
 [JsonDerivedType(typeof(OnlineSnapshot), "online_snapshot")]
+[JsonDerivedType(typeof(EventRecord), "event")]
 public abstract record Op;
 
 public sealed record ServerSeen(int ServerId, string Address, string Hostname, DateTime At) : Op;
@@ -47,6 +48,12 @@ public sealed record Heartbeat(int ServerId, DateTime At) : Op;
 
 public sealed record OnlineSnapshot(int ServerId, DateTime At, int Players, int Bots, int MaxPlayers, string Map) : Op;
 
+// A kill, bomb plant or bomb defuse, as it happens. The kill-only fields are null otherwise.
+public sealed record EventRecord(
+    string EventKey, int ServerId, string? SessionKey, ulong SteamId, EventKind Kind, DateTime At, string Map, int Team,
+    string? Weapon = null, bool? Headshot = null, bool? Noscope = null, bool? Thrusmoke = null, bool? Wallbang = null,
+    bool? Blind = null, ulong? VictimSteamId = null, bool? VictimBot = null, int? Site = null) : Op;
+
 public sealed record MatchStats(int Kills, int Deaths, int Assists, int Headshots, int Damage, int Mvp, int Score);
 
 public sealed record PingStats(int Avg, int Min, int Max, int Samples);
@@ -60,6 +67,13 @@ public enum EndKind
     Stale = 4,
 }
 
+public enum EventKind
+{
+    Kill = 1,
+    BombPlanted = 2,
+    BombDefused = 3,
+}
+
 public static class Teams
 {
     public const int None = 0;