Unify storage ID queries under one implementation

internal/store/query.go

@@ -0,0 +1,30 @@
+package store
+
+import (
+	"context"
+	"database/sql"
+)
+
+type querier interface {
+	QueryRowContext(ctx context.Context, query string, args ...any) *sql.Row
+	QueryContext(ctx context.Context, query string, args ...any) (*sql.Rows, error)
+}
+
+func queryIDs(ctx context.Context, q querier, query string, args ...any) ([]string, error) {
+	rows, err := q.QueryContext(ctx, query, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	ids := []string{}
+	for rows.Next() {
+		id := ""
+		err = rows.Scan(&id)
+		if err != nil {
+			return nil, err
+		}
+		ids = append(ids, id)
+	}
+	return ids, rows.Err()
+}