fix(audit): align session counts with expanded threads

docs/features/session-keeping.mdx

@@ -100,8 +100,11 @@ checkbox. Requests with no detected session remain round robin.
 Audit entries record the session id (`session_id`), and the Audit Logs page
 groups them by default ("Group by session" toggle). Each thread shows its
 latest request with a count badge; the expander on the left unfolds the older
-requests. `GET /admin/audit/sessions` serves the thread list;
-`GET /admin/audit/log?session_id=…` returns one session's entries.
+requests. The badge counts the complete session. Filters select which sessions
+appear and which matching request represents each thread.
+`GET /admin/audit/sessions` returns each thread's `request_count` and latest
+matching audit-log entry. `GET /admin/audit/log?session_id=…` returns all
+requests in an expanded session.
 
 ## Configuration
 

internal/admin/handler.go

@@ -169,11 +169,8 @@ type auditConversationResponse struct {
 }
 
 type auditSessionResponse struct {
-	SessionID      string                `json:"session_id,omitempty"`
-	Count          int                   `json:"count"`
-	FirstTimestamp time.Time             `json:"first_timestamp"`
-	LastTimestamp  time.Time             `json:"last_timestamp"`
-	Latest         auditLogEntryResponse `json:"latest"`
+	RequestCount int                   `json:"request_count"`
+	Latest       auditLogEntryResponse `json:"latest"`
 }
 
 type auditSessionsListResponse struct {

internal/admin/handler_audit.go

@@ -192,8 +192,8 @@ func parseAuditLogQueryParams(c *echo.Context) (auditlog.LogQueryParams, error)
 //
 // @Summary      Get paginated audit sessions (threads)
 // @Description  Groups audit log entries by session id into threads and returns
-// @Description  one summary per thread — its latest entry, entry count, and time
-// @Description  span — ordered by latest activity. Entries without a session id
+// @Description  one summary per thread — its latest matching entry and complete
+// @Description  request count — ordered by latest activity. Entries without a session id
 // @Description  appear as single-entry threads. Filters apply to entries before
 // @Description  grouping.
 // @Tags         admin
@@ -264,11 +264,8 @@ func (h *Handler) AuditSessions(c *echo.Context) error {
 		// same slim payload contract as /admin/audit/log.
 		slimAuditListEntry(&enriched.Entries[i])
 		response.Sessions[i] = auditSessionResponse{
-			SessionID:      session.SessionID,
-			Count:          session.Count,
-			FirstTimestamp: session.FirstTimestamp,
-			LastTimestamp:  session.LastTimestamp,
-			Latest:         enriched.Entries[i],
+			RequestCount: session.RequestCount,
+			Latest:       enriched.Entries[i],
 		}
 	}
 	return c.JSON(http.StatusOK, response)

internal/admin/handler_audit_sessions_test.go

@@ -38,10 +38,8 @@ func TestAuditSessions_Success(t *testing.T) {
 		sessionsResult: &auditlog.SessionListResult{
 			Sessions: []auditlog.SessionSummary{
 				{
-					SessionID:      "sess-a",
-					Count:          3,
-					FirstTimestamp: now.Add(-time.Minute),
-					LastTimestamp:  now,
+					SessionID:    "sess-a",
+					RequestCount: 6,
 					Latest: auditlog.LogEntry{
 						ID:        "log-3",
 						Timestamp: now,
@@ -51,9 +49,7 @@ func TestAuditSessions_Success(t *testing.T) {
 					},
 				},
 				{
-					Count:          1,
-					FirstTimestamp: now.Add(-time.Hour),
-					LastTimestamp:  now.Add(-time.Hour),
+					RequestCount: 1,
 					Latest: auditlog.LogEntry{
 						ID:        "log-1",
 						Timestamp: now.Add(-time.Hour),
@@ -83,9 +79,8 @@ func TestAuditSessions_Success(t *testing.T) {
 
 	var result struct {
 		Sessions []struct {
-			SessionID string             `json:"session_id"`
-			Count     int                `json:"count"`
-			Latest    *auditlog.LogEntry `json:"latest"`
+			RequestCount int                `json:"request_count"`
+			Latest       *auditlog.LogEntry `json:"latest"`
 		} `json:"sessions"`
 		Total int `json:"total"`
 	}
@@ -95,13 +90,13 @@ func TestAuditSessions_Success(t *testing.T) {
 	if result.Total != 2 || len(result.Sessions) != 2 {
 		t.Fatalf("total=%d sessions=%d, want 2/2", result.Total, len(result.Sessions))
 	}
-	if result.Sessions[0].SessionID != "sess-a" || result.Sessions[0].Count != 3 {
+	if result.Sessions[0].RequestCount != 6 {
 		t.Errorf("first session = %+v", result.Sessions[0])
 	}
 	if result.Sessions[0].Latest == nil || result.Sessions[0].Latest.ID != "log-3" {
 		t.Errorf("latest entry not embedded: %+v", result.Sessions[0].Latest)
 	}
-	if result.Sessions[1].SessionID != "" || result.Sessions[1].Count != 1 {
+	if result.Sessions[1].RequestCount != 1 {
 		t.Errorf("singleton thread = %+v", result.Sessions[1])
 	}
 }
@@ -112,11 +107,9 @@ func TestAuditSessions_SlimsLatestEntries(t *testing.T) {
 	reader := &mockAuditReader{
 		sessionsResult: &auditlog.SessionListResult{
 			Sessions: []auditlog.SessionSummary{{
-				SessionID:      "sess-a",
-				Count:          2,
-				FirstTimestamp: entry.Timestamp.Add(-time.Minute),
-				LastTimestamp:  entry.Timestamp,
-				Latest:         entry,
+				SessionID:    "sess-a",
+				RequestCount: 2,
+				Latest:       entry,
 			}},
 			Total: 1,
 			Limit: 25,