Replace comma-separated tags with relational tag system.

- Add tags and domain_tags tables
- Support tag management
- Support user isolation (global/private tags)
- Add filtering all domain views to operations
- Update all domain views automatically

database/migrations/020_create_tags_system.sql

@@ -0,0 +1,90 @@
+-- Create comprehensive tags system with user isolation support
+-- This migration creates the tags table, domain_tags junction table, migrates existing data, and adds user isolation
+
+-- Create tags table for better tag management
+CREATE TABLE IF NOT EXISTS tags (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    name VARCHAR(100) NOT NULL,
+    color VARCHAR(50) DEFAULT 'bg-gray-100 text-gray-700 border-gray-300',
+    description TEXT NULL,
+    usage_count INT DEFAULT 0,
+    user_id INT NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE SET NULL,
+    INDEX idx_name (name),
+    INDEX idx_usage_count (usage_count),
+    INDEX idx_user_id (user_id),
+    UNIQUE KEY unique_user_tag (user_id, name)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- Create domain_tags junction table for many-to-many relationship
+CREATE TABLE IF NOT EXISTS domain_tags (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    domain_id INT NOT NULL,
+    tag_id INT NOT NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (domain_id) REFERENCES domains(id) ON DELETE CASCADE,
+    FOREIGN KEY (tag_id) REFERENCES tags(id) ON DELETE CASCADE,
+    UNIQUE KEY unique_domain_tag (domain_id, tag_id),
+    INDEX idx_domain_id (domain_id),
+    INDEX idx_tag_id (tag_id)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- Insert default tags with their colors (global tags)
+INSERT INTO tags (name, color, description, user_id) VALUES
+('production', 'bg-green-100 text-green-700 border-green-300', 'Production environment domains', NULL),
+('staging', 'bg-yellow-100 text-yellow-700 border-yellow-300', 'Staging environment domains', NULL),
+('development', 'bg-blue-100 text-blue-700 border-blue-300', 'Development environment domains', NULL),
+('client', 'bg-purple-100 text-purple-700 border-purple-300', 'Client-related domains', NULL),
+('personal', 'bg-orange-100 text-orange-700 border-orange-300', 'Personal domains', NULL),
+('archived', 'bg-gray-100 text-gray-700 border-gray-300', 'Archived or inactive domains', NULL)
+ON DUPLICATE KEY UPDATE color = VALUES(color), description = VALUES(description);
+
+-- Migrate existing comma-separated tags to the new tag system
+-- Create a temporary table to store the migration data
+CREATE TEMPORARY TABLE temp_domain_tags AS
+SELECT 
+    d.id as domain_id,
+    TRIM(SUBSTRING_INDEX(SUBSTRING_INDEX(d.tags, ',', n.n), ',', -1)) as tag_name
+FROM domains d
+CROSS JOIN (
+    SELECT 1 as n UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 
+    UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9 UNION SELECT 10
+) n
+WHERE d.tags IS NOT NULL 
+  AND d.tags != ''
+  AND CHAR_LENGTH(d.tags) - CHAR_LENGTH(REPLACE(d.tags, ',', '')) >= n.n - 1
+  AND TRIM(SUBSTRING_INDEX(SUBSTRING_INDEX(d.tags, ',', n.n), ',', -1)) != '';
+
+-- Insert new tags that don't exist yet (assign to domain owner)
+-- Note: If the same tag name is used by multiple users, only the first one will be created
+-- due to the UNIQUE constraint on (user_id, name). This is intentional to avoid conflicts.
+INSERT IGNORE INTO tags (name, color, description, user_id)
+SELECT DISTINCT 
+    tdt.tag_name,
+    'bg-gray-100 text-gray-700 border-gray-300' as color,
+    CONCAT('Tag: ', tdt.tag_name) as description,
+    d.user_id
+FROM temp_domain_tags tdt
+JOIN domains d ON d.id = tdt.domain_id
+WHERE tdt.tag_name NOT IN (SELECT name FROM tags);
+
+-- Insert domain-tag relationships
+INSERT IGNORE INTO domain_tags (domain_id, tag_id)
+SELECT 
+    tdt.domain_id,
+    t.id as tag_id
+FROM temp_domain_tags tdt
+JOIN tags t ON t.name = tdt.tag_name;
+
+-- Update usage counts
+UPDATE tags t 
+SET usage_count = (
+    SELECT COUNT(*) 
+    FROM domain_tags dt 
+    WHERE dt.tag_id = t.id
+);
+
+-- Drop the old tags column from domains table
+ALTER TABLE domains DROP COLUMN tags;