diff --git a/docs/INTERFACE_PATTERN_MIGRATION.md b/docs/INTERFACE_PATTERN_MIGRATION.md
index b3a6aef..8b78977 100644
--- a/docs/INTERFACE_PATTERN_MIGRATION.md
+++ b/docs/INTERFACE_PATTERN_MIGRATION.md
@@ -28,6 +28,9 @@ imports, synchronization, quality review, and reversible merge operations.
   reads never infer deletions.
 - Merge and communication-governance operations append auditable evidence and
   never silently erase prior state.
+- Request feedback is rendered as a compact shared alert over the full-height
+  workspace. It does not become a grid row or displace the source, contact, and
+  detail columns.
 
 Backend and WebUI manifests publish matching route/section/action surfaces.
 English and German catalogues include the owned interaction vocabulary; major
diff --git a/src/govoplan_addresses/backend/service.py b/src/govoplan_addresses/backend/service.py
index a5aa010..fa2a19a 100644
--- a/src/govoplan_addresses/backend/service.py
+++ b/src/govoplan_addresses/backend/service.py
@@ -12,7 +12,7 @@ import unicodedata
 import urllib.parse
 from typing import Any
 
-from sqlalchemy import and_, false, func, or_
+from sqlalchemy import and_, exists, false, func, or_
 from sqlalchemy.orm import Session, selectinload
 
 from govoplan_core.auth import ApiPrincipal
@@ -3256,21 +3256,26 @@ def _filtered_contact_query(
         )
         if address_book_id and address_list.address_book_id != address_book_id:
             raise AddressBookError("Address list does not belong to the selected address book.")
-        contact_query = contact_query.join(
-            AddressListEntry,
-            AddressListEntry.contact_id == Contact.id,
-        ).filter(AddressListEntry.address_list_id == address_list_id)
+        contact_query = contact_query.filter(
+            exists().where(
+                AddressListEntry.contact_id == Contact.id,
+                AddressListEntry.address_list_id == address_list_id,
+            )
+        )
     normalized_query = _trim(query)
     if normalized_query:
         pattern = f"%{normalized_query.lower()}%"
-        contact_query = contact_query.outerjoin(ContactEmail).filter(
+        contact_query = contact_query.filter(
             or_(
                 func.lower(Contact.display_name).like(pattern),
                 func.lower(Contact.organization).like(pattern),
-                func.lower(ContactEmail.email).like(pattern),
+                exists().where(
+                    ContactEmail.contact_id == Contact.id,
+                    func.lower(ContactEmail.email).like(pattern),
+                ),
             )
         )
-    return contact_query.distinct()
+    return contact_query
 
 
 def get_visible_contact(session: Session, principal: ApiPrincipal, contact_id: str, *, include_deleted: bool = False) -> Contact:
diff --git a/tests/test_addresses_service.py b/tests/test_addresses_service.py
index c6be140..b875f45 100644
--- a/tests/test_addresses_service.py
+++ b/tests/test_addresses_service.py
@@ -6,6 +6,7 @@ from datetime import timedelta
 from unittest.mock import patch
 
 from sqlalchemy import create_engine, inspect
+from sqlalchemy.dialects import postgresql
 from sqlalchemy.orm import sessionmaker
 
 from govoplan_core.core.change_sequence import ChangeSequenceEntry
@@ -142,6 +143,7 @@ from govoplan_addresses.backend.service import (
     suggest_duplicate_contacts,
     resolve_trusted_deployment_carddav_credential_ref,
     _carddav_client_for_source,
+    _filtered_contact_query,
 )
 
 
@@ -309,6 +311,27 @@ class AddressServiceTest(unittest.TestCase):
         self.session.commit()
         self.assertEqual([item.id for item in list_contacts(self.session, self.principal, address_book_id=book.id)], [contact.id])
 
+    def test_contact_query_is_postgresql_json_safe(self) -> None:
+        book = create_address_book(
+            self.session,
+            self.principal,
+            AddressBookCreateRequest(scope_type="user", name="PostgreSQL-safe"),
+        )
+        self.session.commit()
+
+        contact_query = _filtered_contact_query(
+            self.session,
+            self.principal,
+            address_book_id=book.id,
+            address_list_id=None,
+            query="example",
+            include_deleted=False,
+        )
+        compiled = str(contact_query.statement.compile(dialect=postgresql.dialect()))
+
+        self.assertNotIn("SELECT DISTINCT", compiled.upper())
+        self.assertIn("EXISTS", compiled.upper())
+
     def test_contact_and_relationship_routes_emit_value_free_audit_evidence(self) -> None:
         book = create_address_book(
             self.session,
diff --git a/webui/src/features/addressbook/AddressBookPage.tsx b/webui/src/features/addressbook/AddressBookPage.tsx
index 7b2e8a0..65c4e9b 100644
--- a/webui/src/features/addressbook/AddressBookPage.tsx
+++ b/webui/src/features/addressbook/AddressBookPage.tsx
@@ -2978,8 +2978,8 @@ export default function AddressBookPage({ settings, auth, onAuthChange }: Props)
 
   return (
     <div className="workspace-data-page module-entry-page address-book-page address-book-fullscreen">
-      {error && <DismissibleAlert tone="danger" resetKey={error}>{error}</DismissibleAlert>}
-      {notice && !error && <DismissibleAlert tone="success" resetKey={notice}>{notice}</DismissibleAlert>}
+      {error && <DismissibleAlert className="address-error" compact tone="danger" resetKey={error}>{error}</DismissibleAlert>}
+      {notice && !error && <DismissibleAlert className="address-error" compact tone="success" resetKey={notice}>{notice}</DismissibleAlert>}
       {!canWriteBooks && !canWriteLists && !canWriteContacts && <ActionBlockerHint
         tone="info"
         reason={{