Fix all errcheck linter issues

Co-authored-by: Junie <junie@jetbrains.com>

internal/db/db_test.go

@@ -13,7 +13,7 @@ func TestOpenAndMigrate(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Open: %v", err)
 	}
-	defer database.Close()
+	defer func() { _ = database.Close() }()
 
 	if err := Migrate(database); err != nil {
 		t.Fatalf("Migrate: %v", err)
@@ -37,7 +37,7 @@ func TestOpenAndMigrate(t *testing.T) {
 
 	// Check migration version.
 	var version int
-	database.QueryRow("SELECT MAX(version) FROM schema_migrations").Scan(&version)
+	_ = database.QueryRow("SELECT MAX(version) FROM schema_migrations").Scan(&version)
 	if version != 1 {
 		t.Errorf("migration version: got %d, want 1", version)
 	}