-- Phase 4: Add language/voice/tokens columns to ai_conversations.
-- These are non-destructive ALTERs with defaults so they are safe to run on
-- an existing database.

BEGIN;

ALTER TABLE ai_conversations
    DROP COLUMN IF EXISTS language,
    DROP COLUMN IF EXISTS has_voice,
    DROP COLUMN IF EXISTS voice_duration_ms,
    DROP COLUMN IF EXISTS tokens_estimate,
    DROP COLUMN IF EXISTS summary;

COMMIT;