CI fixture database (pinned)

The database CI reads, pinned by SHA-256 in src/quantpulse/demo_data.py.

Separate from the rolling demo-data asset on purpose. CI used to fetch the rolling
one, so a bad nightly refresh failed unrelated code pull requests with a message that
pointed at the Streamlit Settings page rather than at the database -- which is exactly
what happened on 2026-09-15.

This copy changes only when someone deliberately rolls it forward and commits the new
digest. The rolling asset stays the thing the public demo and ./run.sh read, and the
current data is still exercised by the publish workflow's static-site gate.

Demo database (rolling)

The pre-built SQLite database the public demo and ./run.sh read.

Replaced in place by each scheduled data refresh, so this tag always points at
the current file. It lives here rather than in the repository because 40
committed revisions of it accounted for 309 MB of a 317 MB repository --
97.5% -- growing about 7.7 MB per refresh, five refreshes a week.

./run.sh downloads it on first run if it is not already present. Nothing
needs an API key.