-- Additive migration for the draft/publish feature.
-- Adds topic.is_published to an ALREADY-DEPLOYED jqc_features database.
-- Safe to re-run: guarded by an information_schema existence check (MySQL has
-- no ADD COLUMN IF NOT EXISTS). New deploys don't need this — schema.sql already
-- includes the column.

USE jqc_features;

SET @col := (
  SELECT COUNT(*) FROM information_schema.columns
  WHERE table_schema = DATABASE()
    AND table_name = 'topic'
    AND column_name = 'is_published'
);
SET @sql := IF(@col = 0,
  'ALTER TABLE topic ADD COLUMN is_published TINYINT(1) NOT NULL DEFAULT 1 AFTER sort_order',
  'SELECT 1');
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;