fix(migration): add missing FocusItem.source column from prisma db push drift

- Column exists in Prisma schema + production but not in migration files
- Idempotent: checks INFORMATION_SCHEMA before ALTER TABLE

Co-Authored-By: Claude <noreply@anthropic.com>

prisma/migrations/20260620000007_fix_focus_item_source_column/migration.sql

@@ -0,0 +1,24 @@
+-- Fix: FocusItem.source 列通过 prisma db push 添加到生产但未在 migration 中记录
+-- 使用条件逻辑确保可重复执行（列可能已存在）
+SET @col_exists = (SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+  WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'FocusItem' AND COLUMN_NAME = 'source');
+
+SET @sql = IF(@col_exists = 0,
+  'ALTER TABLE `FocusItem` ADD COLUMN `source` VARCHAR(32) NULL AFTER `status`',
+  'SELECT "FocusItem.source already exists, skipping" AS info');
+
+PREPARE stmt FROM @sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+-- 同样条件添加 createdAt 索引
+SET @idx_exists = (SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+  WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'FocusItem' AND INDEX_NAME = 'FocusItem_createdAt_idx');
+
+SET @sql2 = IF(@idx_exists = 0,
+  'ALTER TABLE `FocusItem` ADD INDEX `FocusItem_createdAt_idx` (`createdAt`)',
+  'SELECT "FocusItem.createdAt_idx already exists, skipping" AS info');
+
+PREPARE stmt2 FROM @sql2;
+EXECUTE stmt2;
+DEALLOCATE PREPARE stmt2;