diff --git a/atvm/watcher-service/atvm_run_watcher.py b/atvm/watcher-service/atvm_run_watcher.py
index cc75130..1ff6c45 100644
--- a/atvm/watcher-service/atvm_run_watcher.py
+++ b/atvm/watcher-service/atvm_run_watcher.py
@@ -12,7 +12,7 @@ import time
 import urllib.request
 import xml.etree.ElementTree as ET
 from dataclasses import dataclass
-from datetime import datetime, timezone
+from datetime import datetime, timedelta, timezone
 from pathlib import Path
 from typing import Dict, List, Optional, Tuple
 
@@ -608,6 +608,67 @@ def corrected_categorized_display_name(raw_display_name: str, hosts: List[str])
     return re.sub(r"-(amazonlinux|centos|ubuntu|rocky|redhat|oracle|fedora|debian|suse|windows|w2k)-batch", f"-{group}-batch", raw_display_name)
 
 
+def logical_categorized_key(display_name: str) -> str:
+    match = re.match(
+        r"^(.*?-(amazonlinux|centos|ubuntu|rocky|redhat|oracle|fedora|debian|suse|windows|w2k))-batch\d+_\d+.*$",
+        display_name,
+    )
+    if match:
+        return sanitize_key(match.group(1))
+    return sanitize_key(display_name)
+
+
+def merge_categorized_state(
+    merged: Dict[str, Dict[str, object]],
+    display_name: str,
+    state: str,
+    host_results: Dict[str, HostResult],
+    start_ts: Optional[datetime],
+    end_ts: Optional[datetime],
+    currents_url: Optional[str],
+    notes: List[str],
+) -> None:
+    key = logical_categorized_key(display_name)
+    existing = merged.get(key)
+    if existing is None:
+        merged[key] = {
+            "key": key,
+            "display_name": display_name,
+            "state": state,
+            "host_results": dict(host_results),
+            "start_ts": start_ts,
+            "end_ts": end_ts,
+            "currents_url": currents_url,
+            "notes": list(notes),
+        }
+        return
+
+    existing["host_results"].update(host_results)
+
+    if start_ts and (existing["start_ts"] is None or start_ts < existing["start_ts"]):
+        existing["start_ts"] = start_ts
+    if end_ts and (existing["end_ts"] is None or end_ts > existing["end_ts"]):
+        existing["end_ts"] = end_ts
+    if currents_url and not existing["currents_url"]:
+        existing["currents_url"] = currents_url
+
+    for note in notes:
+        if note not in existing["notes"]:
+            existing["notes"].append(note)
+
+    existing_state = existing["state"]
+    if state == "CANCELLED" or existing_state == "CANCELLED":
+        existing["state"] = "CANCELLED"
+    elif state == "RUNNING" or existing_state == "RUNNING":
+        existing["state"] = "RUNNING"
+    elif state == "FAILED" or existing_state == "FAILED":
+        existing["state"] = "FAILED"
+    elif state == "COMPLETED" or existing_state == "COMPLETED":
+        existing["state"] = "COMPLETED"
+    else:
+        existing["state"] = state
+
+
 def extract_segment_build_name(segment_text: str, parent_build_name: str) -> Optional[str]:
     patterns = [
         rf"({re.escape(parent_build_name)}-[A-Za-z0-9_.-]*batch\d+_\d+)",
@@ -746,7 +807,7 @@ def discover_categorized_subruns(
     current_subrun_build = extract_active_subrun_build(build_name)
     expected_hosts = extract_expected_hosts(log_text)
     completed_summaries = extract_completed_subrun_summaries(log_text, inventory)
-    subrun_states: List[Dict[str, object]] = []
+    merged_subrun_states: Dict[str, Dict[str, object]] = {}
     completed_hosts: List[str] = []
     discovered_builds: List[str] = []
     current_summary_index = 0
@@ -818,17 +879,15 @@ def discover_categorized_subruns(
                 start_ts = min(xml_mtime, end_ts) if end_ts else xml_mtime
             if end_ts and start_ts > end_ts:
                 start_ts = end_ts
-            subrun_states.append(
-                {
-                    "key": sanitize_key(display_name),
-                    "display_name": display_name,
-                    "state": state,
-                    "host_results": host_results,
-                    "start_ts": start_ts,
-                    "end_ts": end_ts,
-                    "currents_url": summary["currents_url"] if summary else None,
-                    "notes": notes,
-                }
+            merge_categorized_state(
+                merged_subrun_states,
+                display_name=display_name,
+                state=state,
+                host_results=host_results,
+                start_ts=start_ts,
+                end_ts=end_ts,
+                currents_url=summary["currents_url"] if summary else None,
+                notes=notes,
             )
 
     if current_subrun_build and current_subrun_build not in discovered_builds:
@@ -849,20 +908,18 @@ def discover_categorized_subruns(
             notes.append(f"Child build id is `{current_subrun_build}`, but the actual grouped run was inferred from host execution as `{display_name}`.")
         if cancelled:
             notes.append("Cancellation marker detected.")
-        subrun_states.append(
-            {
-                "key": sanitize_key(current_subrun_build),
-                "display_name": display_name,
-                "state": "CANCELLED" if cancelled else "RUNNING",
-                "host_results": host_results,
-                "start_ts": started_at,
-                "end_ts": None,
-                "currents_url": None,
-                "notes": notes,
-            }
+        merge_categorized_state(
+            merged_subrun_states,
+            display_name=display_name,
+            state="CANCELLED" if cancelled else "RUNNING",
+            host_results=host_results,
+            start_ts=started_at,
+            end_ts=None,
+            currents_url=None,
+            notes=notes,
         )
 
-    return subrun_states
+    return list(merged_subrun_states.values())
 
 
 def determine_state(