2nd

backend/migrations/add_public_feature.sql

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+-- Add public/private feature to TodoItem table
+-- Date: 2025-08-29
+
+-- Add is_public column to todo_item table
+ALTER TABLE todo_item 
+ADD COLUMN is_public BOOLEAN DEFAULT FALSE COMMENT '是否公開';
+
+-- Add tags column to todo_item table (JSON type for flexible tagging)
+ALTER TABLE todo_item 
+ADD COLUMN tags JSON DEFAULT NULL COMMENT '標籤';
+
+-- Create index for public todos query performance
+CREATE INDEX idx_is_public ON todo_item(is_public);
+
+-- Create index for tags search (if MySQL version supports JSON index)
+-- CREATE INDEX idx_tags ON todo_item((CAST(tags AS CHAR(255))));
+
+-- Update existing todos to be private by default
+UPDATE todo_item SET is_public = FALSE WHERE is_public IS NULL;