diff --git a/planfile/core/store_tickets.py b/planfile/core/store_tickets.py
index 631198c..80e961b 100644
--- a/planfile/core/store_tickets.py
+++ b/planfile/core/store_tickets.py
@@ -21,6 +21,15 @@ def _ticket_from_data(self, t_data: dict[str, Any]) -> Ticket | None:
             # legacy YAML compat: British 'cancelled' → American 'canceled'
             if t_data.get('status') == 'cancelled':
                 t_data['status'] = 'canceled'
+            # Early queue writers used ``completed`` for both the ticket and
+            # execution terminal.  Project that historical alias as the
+            # canonical ``done`` state without rewriting the authoritative
+            # YAML or its audit history merely because it was read.
+            if t_data.get('status') == 'completed':
+                t_data['status'] = 'done'
+            execution = t_data.get('execution')
+            if isinstance(execution, dict) and execution.get('state') == 'completed':
+                t_data['execution'] = {**execution, 'state': 'done'}
             if 'integration' in t_data and isinstance(t_data['integration'], str):
                 t_data['labels'] = [t_data.pop('integration')]
             if hasattr(self, '_project_ticket_evidence'):
diff --git a/tests/test_ticket_execution.py b/tests/test_ticket_execution.py
index e021682..09fda4d 100644
--- a/tests/test_ticket_execution.py
+++ b/tests/test_ticket_execution.py
@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import pytest
+import yaml
 
 from planfile import (
     Planfile,
@@ -15,6 +16,30 @@
 from planfile.core.store import ImmutableTerminalReopenError
 
 
+def test_legacy_completed_terminal_is_projected_as_done_without_rewriting_yaml(tmp_path):
+    pf = Planfile(str(tmp_path))
+    ticket = pf.create_ticket(
+        name="Historical completed terminal",
+        execution=TicketExecution(state="running"),
+    )
+    sprint_path = tmp_path / ".planfile" / "sprints" / "current.yaml"
+    stored = yaml.safe_load(sprint_path.read_text(encoding="utf-8"))
+    raw_ticket = stored["sprint"]["tickets"][ticket.id]
+    raw_ticket["status"] = "completed"
+    raw_ticket["execution"]["state"] = "completed"
+    sprint_path.write_text(yaml.safe_dump(stored, sort_keys=False), encoding="utf-8")
+
+    loaded = pf.get_ticket(ticket.id)
+
+    assert loaded is not None
+    assert loaded.status == "done"
+    assert loaded.execution is not None
+    assert loaded.execution.state == "done"
+    authoritative = yaml.safe_load(sprint_path.read_text(encoding="utf-8"))
+    assert authoritative["sprint"]["tickets"][ticket.id]["status"] == "completed"
+    assert authoritative["sprint"]["tickets"][ticket.id]["execution"]["state"] == "completed"
+
+
 def test_ticket_round_trip_with_execution_fields(tmp_path):
     pf = Planfile(str(tmp_path))
     ticket = pf.create_ticket(