diff --git a/app/database.py b/app/database.py
index 9b47797..a3ec77a 100644
--- a/app/database.py
+++ b/app/database.py
@@ -197,12 +197,16 @@ class Database:
             return cursor.rowcount > 0
 
     def hard_delete_contact(self, public_key: str) -> bool:
-        """Permanently delete a contact from the database."""
+        """Permanently delete a contact from the database.
+
+        Also clears ignored/blocked rows that reference this contact
+        via FK without ON DELETE CASCADE.
+        """
+        pk = public_key.lower()
         with self._connect() as conn:
-            cursor = conn.execute(
-                "DELETE FROM contacts WHERE public_key = ?",
-                (public_key.lower(),)
-            )
+            conn.execute("DELETE FROM ignored_contacts WHERE public_key = ?", (pk,))
+            conn.execute("DELETE FROM blocked_contacts WHERE public_key = ?", (pk,))
+            cursor = conn.execute("DELETE FROM contacts WHERE public_key = ?", (pk,))
             return cursor.rowcount > 0
 
     def downgrade_stale_device_contacts(self, active_device_keys: set) -> int:
diff --git a/app/schema.sql b/app/schema.sql
index e4f5e50..d4203b1 100644
--- a/app/schema.sql
+++ b/app/schema.sql
@@ -152,13 +152,13 @@ CREATE TABLE IF NOT EXISTS read_status (
 
 -- Ignored contacts (adverts cached but not pending/auto-added)
 CREATE TABLE IF NOT EXISTS ignored_contacts (
-    public_key  TEXT PRIMARY KEY REFERENCES contacts(public_key),
+    public_key  TEXT PRIMARY KEY REFERENCES contacts(public_key) ON DELETE CASCADE,
     created_at  TEXT NOT NULL DEFAULT (datetime('now'))
 );
 
 -- Blocked contacts (ignored + messages hidden from display)
 CREATE TABLE IF NOT EXISTS blocked_contacts (
-    public_key  TEXT PRIMARY KEY REFERENCES contacts(public_key),
+    public_key  TEXT PRIMARY KEY REFERENCES contacts(public_key) ON DELETE CASCADE,
     created_at  TEXT NOT NULL DEFAULT (datetime('now'))
 );