The `preview_migration` function in `app/utils/db_migrate.py` used string
interpolation to dynamically execute a COUNT query on the source database
(`f"SELECT COUNT(*) FROM {quoted_table}"`).
While the table name was quoted via the dialect's identifier preparer and
validated with a regex, string interpolation for raw SQL should be avoided
as it represents an anti-pattern and a theoretical risk for SQL injection
if validation controls are ever bypassed or modified.
This commit replaces the raw string interpolation with safe, parameterized
SQLAlchemy Core query construction `select(func.count()).select_from(table(table_name))`,
which automatically handles table quoting and execution safely. It also removes
the unused `text` import to keep the code clean.
Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
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