diff --git a/src/apps/epic/migrations/0030_sigreservation_seat_fk.py b/src/apps/epic/migrations/0030_sigreservation_seat_fk.py
new file mode 100644
index 0000000..2426ef2
--- /dev/null
+++ b/src/apps/epic/migrations/0030_sigreservation_seat_fk.py
@@ -0,0 +1,23 @@
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('epic', '0029_fix_schizo_cautions'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='sigreservation',
+            name='seat',
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                related_name='sig_reservation',
+                to='epic.tableseat',
+            ),
+        ),
+    ]
diff --git a/src/apps/epic/models.py b/src/apps/epic/models.py
index 41c0f34..ed5f999 100644
--- a/src/apps/epic/models.py
+++ b/src/apps/epic/models.py
@@ -359,6 +359,10 @@ class SigReservation(models.Model):
     gamer = models.ForeignKey(
         settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name='sig_reservations'
     )
+    seat = models.ForeignKey(
+        'TableSeat', null=True, blank=True,
+        on_delete=models.SET_NULL, related_name='sig_reservation',
+    )
     card = models.ForeignKey(
         'TarotCard', on_delete=models.CASCADE, related_name='sig_reservations'
     )
diff --git a/src/apps/epic/views.py b/src/apps/epic/views.py
index f9f1bc5..dfe4772 100644
--- a/src/apps/epic/views.py
+++ b/src/apps/epic/views.py
@@ -10,8 +10,11 @@ from django.shortcuts import redirect, render
 from django.utils import timezone
 
 from apps.drama.models import GameEvent, record
+from django.db.models import Case, IntegerField, Value, When
+
 from apps.epic.models import (
-    GateSlot, Room, RoomInvite, SigReservation, TableSeat, TarotCard, TarotDeck,
+    GateSlot, Room, RoomInvite, SIG_SEAT_ORDER, SigReservation, TableSeat,
+    TarotCard, TarotDeck,
     active_sig_seat, debit_token, levity_sig_cards, gravity_sig_cards,
     select_token, sig_deck_cards,
 )
@@ -92,6 +95,22 @@ def _notify_sig_reserved(room_id, card_id, role, reserved):
 
 SLOT_ROLE_LABELS = {1: "PC", 2: "NC", 3: "EC", 4: "SC", 5: "AC", 6: "BC"}
 
+_SIG_SEAT_ORDERING = Case(
+    *[When(role=r, then=Value(i)) for i, r in enumerate(SIG_SEAT_ORDER)],
+    default=Value(99),
+    output_field=IntegerField(),
+)
+
+
+def _canonical_user_seat(room, user):
+    """Return the user's seat whose role comes first in PC→NC→EC→SC→AC→BC order.
+
+    In normal play (one user = one seat) this is equivalent to .first().
+    For Carte Blanche (one user = all seats) it returns the PC seat, ensuring
+    sig-select cursor placement is seat-based, not position/slot-based.
+    """
+    return room.table_seats.filter(gamer=user).order_by(_SIG_SEAT_ORDERING).first()
+
 _ROLE_SCRAWL_NAMES = {
     "PC": "Player", "NC": "Narrator", "EC": "Economist",
     "SC": "Shepherd", "AC": "Alchemist", "BC": "Builder",
@@ -242,7 +261,7 @@ def _role_select_context(room, user):
         "slots": room.gate_slots.order_by("slot_number"),
     }
     if room.table_status == Room.SIG_SELECT:
-        user_seat = room.table_seats.filter(gamer=user).first() if user.is_authenticated else None
+        user_seat = _canonical_user_seat(room, user) if user.is_authenticated else None
         user_role = user_seat.role if user_seat else None
         user_polarity = None
         if user_role in _LEVITY_ROLES:
@@ -583,7 +602,7 @@ def sig_reserve(request, room_id):
     if room.table_status != Room.SIG_SELECT:
         return HttpResponse(status=400)
 
-    user_seat = room.table_seats.filter(gamer=request.user).first()
+    user_seat = _canonical_user_seat(room, request.user)
     if not user_seat or not user_seat.role:
         return HttpResponse(status=403)
 
@@ -622,7 +641,7 @@ def sig_reserve(request, room_id):
 
     SigReservation.objects.create(
         room=room, gamer=request.user, card=card,
-        role=user_seat.role, polarity=polarity,
+        seat=user_seat, role=user_seat.role, polarity=polarity,
     )
     _notify_sig_reserved(room_id, card.pk, user_seat.role, reserved=True)
     return HttpResponse(status=200)
diff --git a/src/core/settings.py b/src/core/settings.py
index 34f1865..200b039 100644
--- a/src/core/settings.py
+++ b/src/core/settings.py
@@ -57,13 +57,13 @@ INSTALLED_APPS = [
     # Board apps
     'apps.dashboard',
     'apps.gameboard',
+    'apps.billboard',
     # Gamer apps
     'apps.lyric',
     'apps.epic',
     'apps.drama',
-    'apps.billboard',
-    'apps.ap',
     # Custom apps
+    'apps.ap',
     'apps.api',
     'apps.applets',
     'functional_tests',
diff --git a/src/static_src/scss/_card-deck.scss b/src/static_src/scss/_card-deck.scss
index 6a88d43..8f772f8 100644
--- a/src/static_src/scss/_card-deck.scss
+++ b/src/static_src/scss/_card-deck.scss
@@ -507,7 +507,7 @@ html:has(.sig-backdrop) {
     position: fixed;
     inset: 0;
     pointer-events: none;
-    z-index: 9999;
+    z-index: 200;   // above sig-overlay (120), below tray (310)
     overflow: visible;
 }