Peppi Littera 219af75704 fix(security): eliminate SQL string formatting in execute() calls ...

Closes #1911

- insights.py: Pre-compute SELECT queries as class constants instead of
  f-string interpolation at runtime. _SESSION_COLS is now evaluated once
  at class definition time.
- hermes_state.py: Add identifier quoting and whitelist validation for
  ALTER TABLE column names in schema migrations.
- Add 4 tests verifying no injection vectors in SQL query construction.

2026-03-19 15:16:35 +01:00

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