feat(S3): face profile, embedding, and visit CRUD queries

Add create/get/update/delete_cascade for face_profiles, insert/get for
face_embeddings, and insert/get/get_active for visits. All seven query
functions covered by unit tests (327 passing).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/unit/test_visitor_queries.py

@@ -0,0 +1,57 @@
+import time
+import pytest
+from vigilar.storage.queries import (
+    create_face_profile, get_face_profile, get_all_profiles, update_face_profile,
+    delete_face_profile_cascade, insert_face_embedding, get_embeddings_for_profile,
+    insert_visit, get_visits, get_active_visits,
+)
+
+
+def test_create_and_get_profile(test_db):
+    now = time.time()
+    pid = create_face_profile(test_db, first_seen_at=now, last_seen_at=now)
+    assert pid > 0
+    profile = get_face_profile(test_db, pid)
+    assert profile is not None
+    assert profile["name"] is None
+
+
+def test_get_all_profiles(test_db):
+    now = time.time()
+    create_face_profile(test_db, first_seen_at=now, last_seen_at=now)
+    create_face_profile(test_db, name="Bob", first_seen_at=now, last_seen_at=now)
+    assert len(get_all_profiles(test_db)) == 2
+
+
+def test_update_profile(test_db):
+    pid = create_face_profile(test_db, first_seen_at=0, last_seen_at=0)
+    update_face_profile(test_db, pid, name="Alice")
+    assert get_face_profile(test_db, pid)["name"] == "Alice"
+
+
+def test_insert_embedding(test_db):
+    pid = create_face_profile(test_db, first_seen_at=0, last_seen_at=0)
+    eid = insert_face_embedding(test_db, pid, "AAAA", "front", time.time())
+    assert eid > 0
+    assert len(get_embeddings_for_profile(test_db, pid)) == 1
+
+
+def test_insert_and_get_visit(test_db):
+    pid = create_face_profile(test_db, first_seen_at=0, last_seen_at=0)
+    insert_visit(test_db, pid, "front", time.time())
+    assert len(get_visits(test_db)) == 1
+
+
+def test_get_active_visits(test_db):
+    pid = create_face_profile(test_db, first_seen_at=0, last_seen_at=0)
+    insert_visit(test_db, pid, "front", time.time())
+    assert len(get_active_visits(test_db)) == 1
+
+
+def test_delete_cascade(test_db):
+    pid = create_face_profile(test_db, first_seen_at=0, last_seen_at=0)
+    insert_face_embedding(test_db, pid, "AAAA", "front", time.time())
+    insert_visit(test_db, pid, "front", time.time())
+    delete_face_profile_cascade(test_db, pid)
+    assert get_face_profile(test_db, pid) is None
+    assert len(get_embeddings_for_profile(test_db, pid)) == 0