Fix db:push command to forward --tables via `--`

Details

`npm run db:push --tables sections` makes npm consume `--tables` as its own
flag (warning + ignored), passing only `sections` as a stray positional, so
push_db.py errors with "unrecognized arguments: sections". Use
`npm run db:push -- --tables sections` so npm forwards the flag to the script.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Pn8V4h9YWbjYzdSrDiLiVL

Files changed (1)