Crussell/backend/internal/jobs/cleanup_test.go

//go:build test

package jobs

import (
	"context"
	"crypto/sha256"
	"encoding/hex"
	"fmt"
	"os"
	"sync"
	"testing"

	"crussell/db"
	"crussell/handlers/payments"
	"crussell/internal/square"
	"crussell/testutils"
	"crussell/testutils/testdb"
)

func TestMain(m *testing.M) {
	pool := testdb.CreateTestDatabase("crussell_test_jobs")
	db.Conn = db.NewPoolProxy(pool)
	code := m.Run()
	testdb.DestroyTestDatabase(pool, "crussell_test_jobs")
	os.Exit(code)
}

// ============================================================
// SweepSquareWebhookEvents Tests
// ============================================================

func TestSweepSquareWebhookEvents_DeletesOldRows(t *testing.T) {
	ctx := context.Background()

	// Recent event (NOW() — must be preserved)
	if _, err := db.Conn.Exec(ctx,
		"INSERT INTO square_webhook_events (event_id, received_at) VALUES ($1, NOW())",
		"evt_recent"); err != nil {
		t.Fatalf("failed to insert recent webhook event: %v", err)
	}

	// Old event (100 days ago — must be swept)
	if _, err := db.Conn.Exec(ctx,
		"INSERT INTO square_webhook_events (event_id, received_at) VALUES ($1, NOW() - INTERVAL '100 days')",
		"evt_old"); err != nil {
		t.Fatalf("failed to insert old webhook event: %v", err)
	}
	t.Cleanup(func() {
		_, _ = db.Conn.Exec(ctx, "DELETE FROM square_webhook_events WHERE event_id IN ('evt_recent', 'evt_old')")
	})

	n, err := SweepSquareWebhookEvents(ctx)
	if err != nil {
		t.Fatalf("SweepSquareWebhookEvents failed: %v", err)
	}
	if n != 1 {
		t.Errorf("expected 1 row deleted, got %d", n)
	}

	// Old row must be gone
	var oldCount int
	if err := db.Conn.QueryRow(ctx,
		"SELECT COUNT(*) FROM square_webhook_events WHERE event_id = 'evt_old'").Scan(&oldCount); err != nil {
		t.Fatalf("failed to count old event: %v", err)
	}
	if oldCount != 0 {
		t.Errorf("expected old event to be deleted, got %d rows", oldCount)
	}

	// Recent row must remain
	var recentCount int
	if err := db.Conn.QueryRow(ctx,
		"SELECT COUNT(*) FROM square_webhook_events WHERE event_id = 'evt_recent'").Scan(&recentCount); err != nil {
		t.Fatalf("failed to count recent event: %v", err)
	}
	if recentCount != 1 {
		t.Errorf("expected recent event to be preserved, got %d rows", recentCount)
	}
}

func TestSweepSquareWebhookEvents_EmptyTable(t *testing.T) {
	ctx := context.Background()

	if _, err := db.Conn.Exec(ctx, "DELETE FROM square_webhook_events"); err != nil {
		t.Fatalf("failed to clear square_webhook_events: %v", err)
	}

	n, err := SweepSquareWebhookEvents(ctx)
	if err != nil {
		t.Fatalf("SweepSquareWebhookEvents failed on empty table: %v", err)
	}
	if n != 0 {
		t.Errorf("expected 0 rows deleted on empty table, got %d", n)
	}
}

// ============================================================
// ScanCriticalPaymentLogs Tests
// ============================================================

// countCriticalPaymentLogs returns the number of 'critical_payment_log'
// admin_notifications currently in the shared test database.
func countCriticalPaymentLogs(ctx context.Context) int {
	var n int
	if err := db.Conn.QueryRow(ctx,
		"SELECT COUNT(*) FROM admin_notifications WHERE reason = 'critical_payment_log'").Scan(&n); err != nil {
		return -1
	}
	return n
}

// seedStalePendingPayment inserts a payments row still 'pending' with no update
// past the scan threshold (the "money may have moved at Square but the DB never
// recorded it" situation).
func seedStalePendingPayment(t *testing.T) string {
	t.Helper()
	ctx := context.Background()
	var id string
	if err := db.Conn.QueryRow(ctx, `
		INSERT INTO payments (booking_id, payment_type, payment_method, status, amount, created_at, updated_at)
		VALUES (NULL, 'full', 'online_square', 'pending', 50.00,
		        NOW() - INTERVAL '3 hours', NOW() - INTERVAL '3 hours')
		RETURNING id`).Scan(&id); err != nil {
		t.Fatalf("failed to seed stale pending payment: %v", err)
	}
	return id
}

// TestScanCriticalPaymentLogs_StalePendingPayment verifies a payments row still
// 'pending' with no update past the threshold surfaces one admin notification.
func TestScanCriticalPaymentLogs_StalePendingPayment(t *testing.T) {
	ctx := context.Background()
	paymentID := seedStalePendingPayment(t)
	t.Cleanup(func() {
		_, _ = db.Conn.Exec(ctx, "DELETE FROM payments WHERE id = $1", paymentID)
		_, _ = db.Conn.Exec(ctx, "DELETE FROM admin_notifications WHERE reason = 'critical_payment_log'")
	})

	n, err := ScanCriticalPaymentLogs(ctx)
	if err != nil {
		t.Fatalf("ScanCriticalPaymentLogs failed: %v", err)
	}
	if n != 1 {
		t.Errorf("expected 1 notification inserted, got %d", n)
	}
	if got := countCriticalPaymentLogs(ctx); got != 1 {
		t.Errorf("expected 1 critical_payment_log notification, got %d", got)
	}
}

// TestScanCriticalPaymentLogs_FreshPendingPaymentNotNotified verifies a pending
// payment updated within the threshold is NOT surfaced — only rows stuck past
// the threshold represent an unresolved money event.
func TestScanCriticalPaymentLogs_FreshPendingPaymentNotNotified(t *testing.T) {
	ctx := context.Background()
	var paymentID string
	if err := db.Conn.QueryRow(ctx, `
		INSERT INTO payments (booking_id, payment_type, payment_method, status, amount, created_at, updated_at)
		VALUES (NULL, 'full', 'online_square', 'pending', 50.00, NOW(), NOW())
		RETURNING id`).Scan(&paymentID); err != nil {
		t.Fatalf("failed to seed fresh pending payment: %v", err)
	}
	t.Cleanup(func() {
		_, _ = db.Conn.Exec(ctx, "DELETE FROM payments WHERE id = $1", paymentID)
		_, _ = db.Conn.Exec(ctx, "DELETE FROM admin_notifications WHERE reason = 'critical_payment_log'")
	})

	n, err := ScanCriticalPaymentLogs(ctx)
	if err != nil {
		t.Fatalf("ScanCriticalPaymentLogs failed: %v", err)
	}
	if n != 0 {
		t.Errorf("expected 0 notifications for a fresh pending payment, got %d", n)
	}
}

// TestScanCriticalPaymentLogs_StalePendingTillSale verifies the till_sales scan
// (no booking linkage — the notification carries a NULL booking_id).
func TestScanCriticalPaymentLogs_StalePendingTillSale(t *testing.T) {
	ctx := context.Background()

	var userID string
	if err := db.Conn.QueryRow(ctx, `
		INSERT INTO users (n_first_name, n_last_name, phone, date_of_birth)
		VALUES ('Test', 'Till', '+447700900123', '1990-01-01')
		RETURNING id`).Scan(&userID); err != nil {
		t.Fatalf("failed to seed till user: %v", err)
	}
	var saleID string
	if err := db.Conn.QueryRow(ctx, `
		INSERT INTO till_sales (item_type, description, quantity, unit_price, total_amount, payment_method, status, created_by, created_at, updated_at)
		VALUES ('gift_card', 'gift card', 1, 25.00, 25.00, 'online_square', 'pending', $1,
		        NOW() - INTERVAL '3 hours', NOW() - INTERVAL '3 hours')
		RETURNING id`, userID).Scan(&saleID); err != nil {
		t.Fatalf("failed to seed stale pending till sale: %v", err)
	}
	t.Cleanup(func() {
		_, _ = db.Conn.Exec(ctx, "DELETE FROM till_sales WHERE id = $1", saleID)
		_, _ = db.Conn.Exec(ctx, "DELETE FROM users WHERE id = $1", userID)
		_, _ = db.Conn.Exec(ctx, "DELETE FROM admin_notifications WHERE reason = 'critical_payment_log'")
	})

	n, err := ScanCriticalPaymentLogs(ctx)
	if err != nil {
		t.Fatalf("ScanCriticalPaymentLogs failed: %v", err)
	}
	if n != 1 {
		t.Errorf("expected 1 notification inserted, got %d", n)
	}
}

// TestScanCriticalPaymentLogs_DedupAndReArm verifies the dedup guard: a second
// scan while an unacknowledged notification exists inserts nothing, but
// acknowledging the notification re-arms the scan while the row stays
// unresolved (the problem is still present, so it is surfaced again).
func TestScanCriticalPaymentLogs_DedupAndReArm(t *testing.T) {
	ctx := context.Background()
	paymentID := seedStalePendingPayment(t)
	t.Cleanup(func() {
		_, _ = db.Conn.Exec(ctx, "DELETE FROM payments WHERE id = $1", paymentID)
		_, _ = db.Conn.Exec(ctx, "DELETE FROM admin_notifications WHERE reason = 'critical_payment_log'")
	})

	n, err := ScanCriticalPaymentLogs(ctx)
	if err != nil {
		t.Fatalf("first scan failed: %v", err)
	}
	if n != 1 {
		t.Fatalf("expected 1 notification on first scan, got %d", n)
	}

	// Unacknowledged notification present → the second scan must insert nothing.
	n, err = ScanCriticalPaymentLogs(ctx)
	if err != nil {
		t.Fatalf("second scan failed: %v", err)
	}
	if n != 0 {
		t.Errorf("expected 0 notifications on re-scan while unacknowledged, got %d", n)
	}
	if got := countCriticalPaymentLogs(ctx); got != 1 {
		t.Errorf("expected exactly 1 notification after dedup, got %d", got)
	}

	// Acknowledging re-arms the scan while the row stays unresolved.
	if _, err := db.Conn.Exec(ctx, "UPDATE admin_notifications SET acknowledged_at = NOW() WHERE reason = 'critical_payment_log'"); err != nil {
		t.Fatalf("failed to acknowledge notification: %v", err)
	}
	n, err = ScanCriticalPaymentLogs(ctx)
	if err != nil {
		t.Fatalf("third scan failed: %v", err)
	}
	if n != 1 {
		t.Errorf("expected 1 notification re-inserted after acknowledge, got %d", n)
	}
	if got := countCriticalPaymentLogs(ctx); got != 2 {
		t.Errorf("expected 2 notifications after re-arm, got %d", got)
	}
}

// TestScanCriticalPaymentLogs_RefundAtAttemptCap verifies a refund still
// 'pending' at the 3-attempt retry cap surfaces a notification (money may have
// moved at Square but the refund outcome was never recorded).
func TestScanCriticalPaymentLogs_RefundAtAttemptCap(t *testing.T) {
	ctx := context.Background()

	var paymentID string
	if err := db.Conn.QueryRow(ctx, `
		INSERT INTO payments (booking_id, payment_type, payment_method, status, amount)
		VALUES (NULL, 'full', 'online_square', 'completed', 50.00)
		RETURNING id`).Scan(&paymentID); err != nil {
		t.Fatalf("failed to seed payment for refund: %v", err)
	}
	var refundID string
	if err := db.Conn.QueryRow(ctx, `
		INSERT INTO refunds (payment_id, amount, status, refund_attempts, reason)
		VALUES ($1, 10.00, 'pending', 3, 'customer request')
		RETURNING id`, paymentID).Scan(&refundID); err != nil {
		t.Fatalf("failed to seed refund at attempt cap: %v", err)
	}
	t.Cleanup(func() {
		_, _ = db.Conn.Exec(ctx, "DELETE FROM refunds WHERE id = $1", refundID)
		_, _ = db.Conn.Exec(ctx, "DELETE FROM payments WHERE id = $1", paymentID)
		_, _ = db.Conn.Exec(ctx, "DELETE FROM admin_notifications WHERE reason = 'critical_payment_log'")
	})

	n, err := ScanCriticalPaymentLogs(ctx)
	if err != nil {
		t.Fatalf("ScanCriticalPaymentLogs failed: %v", err)
	}
	if n != 1 {
		t.Errorf("expected 1 notification inserted, got %d", n)
	}
	if got := countCriticalPaymentLogs(ctx); got != 1 {
		t.Errorf("expected 1 critical_payment_log notification, got %d", got)
	}
}

// TestScanCriticalPaymentLogs_RefundBelowCapNotNotified verifies only refunds at
// the 3-attempt cap are surfaced; a pending refund with retries remaining is
// still being worked by the refund sweep.
func TestScanCriticalPaymentLogs_RefundBelowCapNotNotified(t *testing.T) {
	ctx := context.Background()

	var paymentID string
	if err := db.Conn.QueryRow(ctx, `
		INSERT INTO payments (booking_id, payment_type, payment_method, status, amount)
		VALUES (NULL, 'full', 'online_square', 'completed', 50.00)
		RETURNING id`).Scan(&paymentID); err != nil {
		t.Fatalf("failed to seed payment for refund: %v", err)
	}
	var refundID string
	if err := db.Conn.QueryRow(ctx, `
		INSERT INTO refunds (payment_id, amount, status, refund_attempts, reason)
		VALUES ($1, 10.00, 'pending', 1, 'customer request')
		RETURNING id`, paymentID).Scan(&refundID); err != nil {
		t.Fatalf("failed to seed refund below attempt cap: %v", err)
	}
	t.Cleanup(func() {
		_, _ = db.Conn.Exec(ctx, "DELETE FROM refunds WHERE id = $1", refundID)
		_, _ = db.Conn.Exec(ctx, "DELETE FROM payments WHERE id = $1", paymentID)
		_, _ = db.Conn.Exec(ctx, "DELETE FROM admin_notifications WHERE reason = 'critical_payment_log'")
	})

	n, err := ScanCriticalPaymentLogs(ctx)
	if err != nil {
		t.Fatalf("ScanCriticalPaymentLogs failed: %v", err)
	}
	if n != 0 {
		t.Errorf("expected 0 notifications for a refund below the attempt cap, got %d", n)
	}
}

// ============================================================
// RetryPendingSquareErasures — GDPR Square outbox job (batch-1 fix)
// ============================================================

// recordingErasureClient embeds the dev mock and records every Square erasure
// call, with opt-in failure injection, so tests can assert exactly what the
// retry-square-erasures job calls (and doesn't call) at Square.
type recordingErasureClient struct {
	square.SquareClient
	mu               sync.Mutex
	deletedCards     []string
	deletedCustomers []string
	failCards        bool
	failCustomers    bool
}

func (c *recordingErasureClient) DeleteCardOnFile(ctx context.Context, cardID string) error {
	c.mu.Lock()
	c.deletedCards = append(c.deletedCards, cardID)
	c.mu.Unlock()
	if c.failCards {
		return fmt.Errorf("square: simulated card erasure failure")
	}
	return c.SquareClient.DeleteCardOnFile(ctx, cardID)
}

func (c *recordingErasureClient) DeleteCustomer(ctx context.Context, customerID string) error {
	c.mu.Lock()
	c.deletedCustomers = append(c.deletedCustomers, customerID)
	c.mu.Unlock()
	if c.failCustomers {
		return fmt.Errorf("square: simulated customer erasure failure")
	}
	return c.SquareClient.DeleteCustomer(ctx, customerID)
}

func (c *recordingErasureClient) cardDeletes() []string {
	c.mu.Lock()
	defer c.mu.Unlock()
	return append([]string(nil), c.deletedCards...)
}

func (c *recordingErasureClient) customerDeletes() []string {
	c.mu.Lock()
	defer c.mu.Unlock()
	return append([]string(nil), c.deletedCustomers...)
}

// newErasureTestClient builds a recording client over a prod-safe in-memory
// Square stand-in (testutils.NewTestSquareClient compiles under both dev and
// prod build tags, unlike the dev-only square.NewDevClient), forcing
// SQUARE_ENVIRONMENT=mock so a developer's production env var can never panic
// a dev NewDevClient mid-test.
func newErasureTestClient(t *testing.T) *recordingErasureClient {
	t.Helper()
	t.Setenv("SQUARE_ENVIRONMENT", "mock")
	return &recordingErasureClient{SquareClient: testutils.NewTestSquareClient()}
}

// seedErasureOutboxRow inserts a soft-deleted user_saved_cards row that the
// retry-square-erasures job treats as a pending Square erasure outbox entry
// (deleted_at set + last_4 = 'XXXX' + at least one Square reference). Cleanup
// removes the row and any critical notifications the job raised.
func seedErasureOutboxRow(t *testing.T, squareCardID, squareCustomerID *string) string {
	t.Helper()
	ctx := context.Background()
	var cardID, customerID any
	if squareCardID != nil {
		cardID = *squareCardID
	}
	if squareCustomerID != nil {
		customerID = *squareCustomerID
	}
	var id string
	if err := db.Conn.QueryRow(ctx, `
		INSERT INTO user_saved_cards (square_card_id, square_customer_id, brand, last_4, exp_month, exp_year, deleted_at)
		VALUES ($1, $2, 'VISA', 'XXXX', 12, 2030, NOW())
		RETURNING id
	`, cardID, customerID).Scan(&id); err != nil {
		t.Fatalf("failed to seed erasure outbox row: %v", err)
	}
	t.Cleanup(func() {
		_, _ = db.Conn.Exec(ctx, "DELETE FROM user_saved_cards WHERE id = $1", id)
		_, _ = db.Conn.Exec(ctx, "DELETE FROM admin_notifications WHERE reason = 'critical_payment_log'")
	})
	return id
}

// querySquareCardID returns the square_card_id of a row, or nil when NULL.
func querySquareCardID(ctx context.Context, t *testing.T, rowID string) *string {
	t.Helper()
	var id *string
	if err := db.Conn.QueryRow(ctx, "SELECT square_card_id FROM user_saved_cards WHERE id = $1", rowID).Scan(&id); err != nil {
		t.Fatalf("failed to query square_card_id for row %s: %v", rowID, err)
	}
	return id
}

func querySquareCustomerID(ctx context.Context, t *testing.T, rowID string) *string {
	t.Helper()
	var id *string
	if err := db.Conn.QueryRow(ctx, "SELECT square_customer_id FROM user_saved_cards WHERE id = $1", rowID).Scan(&id); err != nil {
		t.Fatalf("failed to query square_customer_id for row %s: %v", rowID, err)
	}
	return id
}

// erasureNotificationID mirrors handlers/user's deterministic notification id
// scheme so the test can assert the exact alert row the job raised.
func erasureNotificationID(key string) string {
	sum := sha256.Sum256([]byte("square-erasure-failure:" + key))
	return "S" + hex.EncodeToString(sum[:])[:11]
}

// TestRetryPendingSquareErasures_DrainsCardOutboxRow verifies a pending card
// erasure is retried at Square and, on success, the outbox row is drained
// (square_card_id NULLed) and reported in the drained count.
func TestRetryPendingSquareErasures_DrainsCardOutboxRow(t *testing.T) {
	ctx := context.Background()
	client := newErasureTestClient(t)

	card, err := client.CreateCardOnFile(ctx, "user-delete-me", "cnon:test-card", "cus_mock_seed")
	if err != nil {
		t.Fatalf("failed to seed mock card: %v", err)
	}
	cardID := card.CardID
	rowID := seedErasureOutboxRow(t, &cardID, nil)

	orig := payments.SquareClient
	payments.SquareClient = client
	t.Cleanup(func() { payments.SquareClient = orig })

	n, err := RetryPendingSquareErasures(ctx)
	if err != nil {
		t.Fatalf("RetryPendingSquareErasures failed: %v", err)
	}
	if n != 1 {
		t.Errorf("expected 1 drained row, got %d", n)
	}
	if got := client.cardDeletes(); len(got) != 1 || got[0] != cardID {
		t.Errorf("expected exactly 1 card deletion call for %q, got %v", cardID, got)
	}
	if id := querySquareCardID(ctx, t, rowID); id != nil {
		t.Errorf("expected square_card_id to be NULL after drain, got %q", *id)
	}
}

// TestRetryPendingSquareErasures_DrainsCustomerOutboxRow verifies the same
// drain for a customer-only outbox row.
func TestRetryPendingSquareErasures_DrainsCustomerOutboxRow(t *testing.T) {
	ctx := context.Background()
	client := newErasureTestClient(t)

	cust, err := client.CreateCustomer(ctx, "Erasure Test", "erasure-test@example.com")
	if err != nil {
		t.Fatalf("failed to seed mock customer: %v", err)
	}
	customerID := cust.ID
	rowID := seedErasureOutboxRow(t, nil, &customerID)

	orig := payments.SquareClient
	payments.SquareClient = client
	t.Cleanup(func() { payments.SquareClient = orig })

	n, err := RetryPendingSquareErasures(ctx)
	if err != nil {
		t.Fatalf("RetryPendingSquareErasures failed: %v", err)
	}
	if n != 1 {
		t.Errorf("expected 1 drained row, got %d", n)
	}
	if got := client.customerDeletes(); len(got) != 1 || got[0] != customerID {
		t.Errorf("expected exactly 1 customer deletion call for %q, got %v", customerID, got)
	}
	if id := querySquareCustomerID(ctx, t, rowID); id != nil {
		t.Errorf("expected square_customer_id to be NULL after drain, got %q", *id)
	}
}

// TestRetryPendingSquareErasures_KeepsFailedCardRowForRetry verifies a failed
// Square deletion leaves the outbox row armed for the next run and raises a
// deduped critical notification (row-scoped key).
func TestRetryPendingSquareErasures_KeepsFailedCardRowForRetry(t *testing.T) {
	ctx := context.Background()
	client := newErasureTestClient(t)
	client.failCards = true

	cardID := "ccof:mock_missing_card"
	rowID := seedErasureOutboxRow(t, &cardID, nil)

	orig := payments.SquareClient
	payments.SquareClient = client
	t.Cleanup(func() { payments.SquareClient = orig })

	n, err := RetryPendingSquareErasures(ctx)
	if err != nil {
		t.Fatalf("RetryPendingSquareErasures failed: %v", err)
	}
	if n != 0 {
		t.Errorf("expected 0 drained rows on failure, got %d", n)
	}
	if id := querySquareCardID(ctx, t, rowID); id == nil || *id != cardID {
		t.Errorf("expected square_card_id %q to be retained for retry, got %v", cardID, id)
	}

	var gotID string
	if err := db.Conn.QueryRow(ctx, "SELECT id FROM admin_notifications WHERE reason = 'critical_payment_log'").Scan(&gotID); err != nil {
		t.Fatalf("expected a critical_payment_log notification to be raised: %v", err)
	}
	if want := erasureNotificationID("row:" + rowID); gotID != want {
		t.Errorf("expected notification id %q, got %q", want, gotID)
	}
}

// TestRetryPendingSquareErasures_NoOpWithoutSquareClient verifies the job is a
// no-op when no Square client is configured: no external call, no drain, no
// error.
func TestRetryPendingSquareErasures_NoOpWithoutSquareClient(t *testing.T) {
	ctx := context.Background()
	cardID := "ccof:mock_card"
	rowID := seedErasureOutboxRow(t, &cardID, nil)

	orig := payments.SquareClient
	payments.SquareClient = nil
	t.Cleanup(func() { payments.SquareClient = orig })

	n, err := RetryPendingSquareErasures(ctx)
	if err != nil {
		t.Fatalf("RetryPendingSquareErasures failed: %v", err)
	}
	if n != 0 {
		t.Errorf("expected 0 drained rows without a Square client, got %d", n)
	}
	if id := querySquareCardID(ctx, t, rowID); id == nil || *id != cardID {
		t.Errorf("expected outbox row to be untouched, got square_card_id %v", id)
	}
}

// TestRetryPendingSquareErasures_KeepsSharedCustomerReferencedByActiveCard
// verifies a shared Square customer is NOT deleted (and its outbox row is
// drained as deliberately-skipped) while any active card of another account
// still references it.
func TestRetryPendingSquareErasures_KeepsSharedCustomerReferencedByActiveCard(t *testing.T) {
	ctx := context.Background()
	client := newErasureTestClient(t)

	cust, err := client.CreateCustomer(ctx, "Shared User", "shared-erasure@example.com")
	if err != nil {
		t.Fatalf("failed to seed mock customer: %v", err)
	}
	customerID := cust.ID

	outboxRowID := seedErasureOutboxRow(t, nil, &customerID)

	var activeUserID string
	if err := db.Conn.QueryRow(ctx, `
		INSERT INTO users (n_first_name, n_last_name, phone, date_of_birth)
		VALUES ('Active', 'User', '+447700900127', '1990-01-01')
		RETURNING id`).Scan(&activeUserID); err != nil {
		t.Fatalf("failed to seed active user: %v", err)
	}
	var activeRowID string
	if err := db.Conn.QueryRow(ctx, `
		INSERT INTO user_saved_cards (user_id, square_card_id, square_customer_id, brand, last_4, exp_month, exp_year)
		VALUES ($1, 'ccof:mock_active', $2, 'VISA', '4242', 12, 2030)
		RETURNING id`, activeUserID, customerID).Scan(&activeRowID); err != nil {
		t.Fatalf("failed to seed active card row: %v", err)
	}
	t.Cleanup(func() {
		_, _ = db.Conn.Exec(ctx, "DELETE FROM user_saved_cards WHERE id = $1", activeRowID)
		_, _ = db.Conn.Exec(ctx, "DELETE FROM users WHERE id = $1", activeUserID)
	})

	orig := payments.SquareClient
	payments.SquareClient = client
	t.Cleanup(func() { payments.SquareClient = orig })

	n, err := RetryPendingSquareErasures(ctx)
	if err != nil {
		t.Fatalf("RetryPendingSquareErasures failed: %v", err)
	}
	if n != 1 {
		t.Errorf("expected 1 drained outbox row, got %d", n)
	}
	if got := client.customerDeletes(); len(got) != 0 {
		t.Errorf("expected NO DeleteCustomer call for a still-referenced customer, got %v", got)
	}
	if id := querySquareCustomerID(ctx, t, outboxRowID); id != nil {
		t.Errorf("expected outbox row square_customer_id to be drained, got %q", *id)
	}
	if id := querySquareCustomerID(ctx, t, activeRowID); id == nil || *id != customerID {
		t.Errorf("expected active row to keep its customer reference, got %v", id)
	}
}