🔒 Fix SQL injection vectors via whitelist validation

[marko1olo]

🎯 What: Hardcoded SQL expressions susceptible to injection via table names
⚠️ Risk: Medium risk B608 warnings raised by bandit and actual vulnerability if unchecked inputs reach query format strings
🛡️ Solution: Implemented a rigorous module-level whitelist validator that verifies table and column names exist in sqlite_master and strictly match an alphanumeric regex prior to query execution. Resolved false-positive Bandit warnings using inline nosec comments.

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PR created automatically by Jules for task 13191043751284355727 started by @marko1olo

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