nxtgauge-backend-rust/crates/db/migrations/20260706100000_ai_usage_logs_preview.up.sql

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-- Add prompt_preview and response_preview columns to ai_usage_logs
-- for audit logging (Task 3 - Ollama Security Hardening)
BEGIN;
ALTER TABLE ai_usage_logs
ADD COLUMN IF NOT EXISTS prompt_preview VARCHAR(200),
ADD COLUMN IF NOT EXISTS response_preview VARCHAR(200);
CREATE INDEX IF NOT EXISTS idx_ai_usage_logs_prompt_preview ON ai_usage_logs(prompt_preview) WHERE prompt_preview IS NOT NULL;
COMMIT;