diff --git a/src-tauri/src/models/graylog.rs b/src-tauri/src/models/graylog.rs
index f29f4a3..5939925 100644
--- a/src-tauri/src/models/graylog.rs
+++ b/src-tauri/src/models/graylog.rs
@@ -393,6 +393,34 @@ impl GraylogSubject {
         let rows = stmt.query_map(params![project_id], subject_from_row)?;
         rows.collect()
     }
+
+    pub fn list_by_project_and_message(
+        conn: &Connection,
+        project_id: &str,
+        normalized_message: &str,
+    ) -> Result<Vec<GraylogSubject>> {
+        let mut stmt = conn.prepare(
+            "SELECT
+                id,
+                project_id,
+                subject_key,
+                source,
+                normalized_message,
+                first_seen_at,
+                last_seen_at,
+                last_score,
+                active_ticket_id,
+                status,
+                created_at,
+                updated_at
+             FROM graylog_subjects
+             WHERE project_id = ?1
+               AND normalized_message = ?2
+             ORDER BY updated_at DESC, id DESC",
+        )?;
+        let rows = stmt.query_map(params![project_id, normalized_message], subject_from_row)?;
+        rows.collect()
+    }
 }
 
 impl GraylogDetection {
@@ -721,4 +749,36 @@ mod tests {
         assert!(subject_detections[0].triggered);
         assert_eq!(subject_detections[0].score, 80);
     }
+
+    #[test]
+    fn test_list_by_project_and_message_returns_all_matching_subjects() {
+        let (conn, project, _, _) = setup();
+        let message = "timeout while calling payment gateway";
+
+        GraylogSubject::upsert_subject(
+            &conn,
+            &project.id,
+            "api|timeout",
+            "api",
+            message,
+            "2026-04-17T08:00:00Z",
+            42,
+        )
+        .expect("first subject upsert should succeed");
+
+        GraylogSubject::upsert_subject(
+            &conn,
+            &project.id,
+            "worker|timeout",
+            "worker",
+            message,
+            "2026-04-17T08:05:00Z",
+            38,
+        )
+        .expect("second subject upsert should succeed");
+
+        let subjects = GraylogSubject::list_by_project_and_message(&conn, &project.id, message)
+            .expect("list by message should succeed");
+        assert_eq!(subjects.len(), 2);
+    }
 }
diff --git a/src-tauri/src/services/graylog_poller.rs b/src-tauri/src/services/graylog_poller.rs
index dd1144f..048cd5d 100644
--- a/src-tauri/src/services/graylog_poller.rs
+++ b/src-tauri/src/services/graylog_poller.rs
@@ -19,6 +19,37 @@ fn should_trigger_subject(score: i32, threshold: i32, has_active_ticket: bool) -
     score >= threshold && !has_active_ticket
 }
 
+fn has_active_ticket_for_message(
+    conn: &Connection,
+    project_id: &str,
+    normalized_message: &str,
+    current_subject_id: &str,
+) -> Result<bool, String> {
+    let related_subjects =
+        GraylogSubject::list_by_project_and_message(conn, project_id, normalized_message)
+            .map_err(|e| format!("list related subjects failed: {}", e))?;
+
+    for related in related_subjects {
+        if related.id == current_subject_id {
+            continue;
+        }
+
+        if let Some(active_ticket_id) = related.active_ticket_id.clone() {
+            match ProcessedTicket::get_by_id(conn, &active_ticket_id) {
+                Ok(ticket) if is_ticket_active(&ticket.status) => {
+                    return Ok(true);
+                }
+                _ => {
+                    GraylogSubject::set_active_ticket(conn, &related.id, None, "idle")
+                        .map_err(|e| format!("clear stale related ticket failed: {}", e))?;
+                }
+            }
+        }
+    }
+
+    Ok(false)
+}
+
 fn synthetic_artifact_id(subject_key: &str) -> i32 {
     // Stable FNV-1a hash so the synthetic id remains deterministic across runs.
     const FNV_OFFSET: u64 = 0xcbf29ce484222325;
@@ -276,6 +307,15 @@ pub async fn poll_project_once(
                 }
             }
 
+            if !has_active_ticket {
+                has_active_ticket = has_active_ticket_for_message(
+                    &conn,
+                    project_id,
+                    &aggregate.normalized_message,
+                    &subject.id,
+                )?;
+            }
+
             (subject, has_active_ticket)
         };
 
@@ -355,7 +395,13 @@ pub async fn poll_project_once(
 
 #[cfg(test)]
 mod tests {
-    use super::{build_graylog_subject_permalink, should_trigger_subject};
+    use super::{
+        build_graylog_subject_permalink, has_active_ticket_for_message, should_trigger_subject,
+    };
+    use crate::db;
+    use crate::models::graylog::GraylogSubject;
+    use crate::models::project::Project;
+    use crate::models::ticket::ProcessedTicket;
 
     #[test]
     fn test_should_trigger_subject_respects_active_ticket() {
@@ -377,4 +423,52 @@ mod tests {
         assert!(url.contains("relative=1800"));
         assert!(url.contains("q=message%3A%22timeout%20user%20%3Cnum%3E%22"));
     }
+
+    #[test]
+    fn test_has_active_ticket_for_message_checks_related_subjects() {
+        let conn = db::init_in_memory().expect("db init should succeed");
+        let project = Project::insert(&conn, "Graylog", "/tmp/graylog", None, "main")
+            .expect("project insert should succeed");
+
+        let first = GraylogSubject::upsert_subject(
+            &conn,
+            &project.id,
+            "api|timeout user <num>",
+            "api",
+            "timeout user <num>",
+            "2026-04-17T10:00:00Z",
+            80,
+        )
+        .expect("first subject should upsert");
+        let second = GraylogSubject::upsert_subject(
+            &conn,
+            &project.id,
+            "worker|timeout user <num>",
+            "worker",
+            "timeout user <num>",
+            "2026-04-17T10:01:00Z",
+            70,
+        )
+        .expect("second subject should upsert");
+
+        let ticket = ProcessedTicket::insert_external(
+            &conn,
+            &project.id,
+            "graylog",
+            Some(&first.id),
+            -123,
+            "[Graylog] timeout user <num>",
+            "{}",
+        )
+        .expect("ticket should insert");
+        ProcessedTicket::update_status(&conn, &ticket.id, "Analyzing")
+            .expect("status update should succeed");
+        GraylogSubject::set_active_ticket(&conn, &first.id, Some(&ticket.id), "queued")
+            .expect("active ticket should set");
+
+        let has_related =
+            has_active_ticket_for_message(&conn, &project.id, "timeout user <num>", &second.id)
+                .expect("related active ticket lookup should succeed");
+        assert!(has_related);
+    }
 }