Move cover bytes to filesystem storage

backend/internal/latest/poller_test.go

@@ -27,7 +27,7 @@ var testOwner = store.Owner{DiscordID: "test-owner", TokenHash: sha256.Sum256([]
 func newTestStore(t *testing.T) (*store.Store, string) {
 	t.Helper()
 	url := pgtest.URL(t)
-	s, err := store.Open(url, testOwner)
+	s, err := store.Open(url, testOwner, t.TempDir())
 	if err != nil {
 		t.Fatalf("Open: %v", err)
 	}
@@ -274,7 +274,7 @@ func TestRunOnceFetchesSharedSeriesOnce(t *testing.T) {
 	// A second reader tracks the same series. The seed is the only
 	// reader-creation path, so a second Open as a different owner is how a
 	// test gets a second reader on the same database.
-	other, err := store.Open(url, store.Owner{DiscordID: "second-reader", TokenHash: sha256.Sum256([]byte("second-token-hash"))})
+	other, err := store.Open(url, store.Owner{DiscordID: "second-reader", TokenHash: sha256.Sum256([]byte("second-token-hash"))}, t.TempDir())
 	if err != nil {
 		t.Fatalf("Open second reader: %v", err)
 	}