Update README.md and add debug error handlers

- Completely rewrote README with all new features and admin routes
- Cleaned up remaining migration files
- Added detailed PHP error/exception handlers to dependencies API
  to help debug the 500 error

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

migrations/015_ticket_dependencies.sql

@@ -1,15 +0,0 @@
--- Migration: Create ticket dependencies table
--- Version: 015
-
-CREATE TABLE IF NOT EXISTS ticket_dependencies (
-    dependency_id INT AUTO_INCREMENT PRIMARY KEY,
-    ticket_id VARCHAR(9) NOT NULL,
-    depends_on_id VARCHAR(9) NOT NULL,
-    dependency_type ENUM('blocks', 'blocked_by', 'relates_to', 'duplicates') DEFAULT 'blocks',
-    created_by INT NULL,
-    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
-    UNIQUE KEY unique_dependency (ticket_id, depends_on_id, dependency_type),
-    INDEX idx_ticket_id (ticket_id),
-    INDEX idx_depends_on_id (depends_on_id),
-    FOREIGN KEY (created_by) REFERENCES users(user_id) ON DELETE SET NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

migrations/016_ticket_attachments.sql

@@ -1,18 +0,0 @@
--- Migration: Create ticket attachments table
--- Date: 2026-01-19
--- Description: Adds support for file attachments on tickets
-
-CREATE TABLE IF NOT EXISTS ticket_attachments (
-    attachment_id INT AUTO_INCREMENT PRIMARY KEY,
-    ticket_id VARCHAR(9) NOT NULL,
-    filename VARCHAR(255) NOT NULL,
-    original_filename VARCHAR(255) NOT NULL,
-    file_size INT NOT NULL,
-    mime_type VARCHAR(100) NOT NULL,
-    uploaded_by INT NULL,
-    uploaded_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
-    FOREIGN KEY (ticket_id) REFERENCES tickets(ticket_id) ON DELETE CASCADE,
-    FOREIGN KEY (uploaded_by) REFERENCES users(user_id) ON DELETE SET NULL,
-    INDEX idx_attachments_ticket (ticket_id),
-    INDEX idx_attachments_uploaded_by (uploaded_by)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

migrations/017_recurring_tickets.sql

@@ -1,29 +0,0 @@
--- Migration: Create recurring tickets table
--- Description: Enables automatic ticket creation on a schedule
-
-CREATE TABLE IF NOT EXISTS recurring_tickets (
-    recurring_id INT AUTO_INCREMENT PRIMARY KEY,
-    title_template VARCHAR(255) NOT NULL,
-    description_template TEXT,
-    category VARCHAR(50) DEFAULT 'General',
-    type VARCHAR(50) DEFAULT 'Task',
-    priority INT DEFAULT 4,
-    assigned_to INT NULL,
-    schedule_type ENUM('daily', 'weekly', 'monthly') NOT NULL,
-    schedule_day INT NULL COMMENT 'Day of week (1-7) for weekly, day of month (1-31) for monthly',
-    schedule_time TIME DEFAULT '09:00:00',
-    next_run_at TIMESTAMP NOT NULL,
-    last_run_at TIMESTAMP NULL,
-    is_active BOOLEAN DEFAULT TRUE,
-    created_by INT NULL,
-    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
-    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
-    FOREIGN KEY (assigned_to) REFERENCES users(user_id) ON DELETE SET NULL,
-    FOREIGN KEY (created_by) REFERENCES users(user_id) ON DELETE SET NULL,
-    INDEX idx_recurring_next_run (next_run_at, is_active),
-    INDEX idx_recurring_active (is_active)
-);
-
--- Sample recurring ticket for testing (commented out)
--- INSERT INTO recurring_tickets (title_template, description_template, category, type, schedule_type, schedule_day, next_run_at)
--- VALUES ('Weekly Server Maintenance Check', 'Perform weekly server health check and maintenance tasks.', 'Maintenance', 'Task', 'weekly', 1, NOW());

migrations/018_custom_fields.sql

@@ -1,39 +0,0 @@
--- Migration: Create custom fields tables
--- Description: Enables custom field definitions per category and stores field values
-
--- Custom field definitions
-CREATE TABLE IF NOT EXISTS custom_field_definitions (
-    field_id INT AUTO_INCREMENT PRIMARY KEY,
-    field_name VARCHAR(100) NOT NULL,
-    field_label VARCHAR(255) NOT NULL,
-    field_type ENUM('text', 'textarea', 'select', 'checkbox', 'date', 'number') NOT NULL,
-    field_options JSON NULL COMMENT 'Options for select fields: {"options": ["Option 1", "Option 2"]}',
-    category VARCHAR(50) NULL COMMENT 'NULL = applies to all categories',
-    is_required BOOLEAN DEFAULT FALSE,
-    display_order INT DEFAULT 0,
-    is_active BOOLEAN DEFAULT TRUE,
-    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
-    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
-    INDEX idx_custom_fields_category (category, is_active),
-    INDEX idx_custom_fields_order (display_order)
-);
-
--- Custom field values for tickets
-CREATE TABLE IF NOT EXISTS custom_field_values (
-    value_id INT AUTO_INCREMENT PRIMARY KEY,
-    ticket_id VARCHAR(9) NOT NULL,
-    field_id INT NOT NULL,
-    field_value TEXT,
-    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
-    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
-    UNIQUE KEY unique_ticket_field (ticket_id, field_id),
-    FOREIGN KEY (field_id) REFERENCES custom_field_definitions(field_id) ON DELETE CASCADE,
-    INDEX idx_custom_values_ticket (ticket_id)
-);
-
--- Sample custom field definitions (commented out)
--- INSERT INTO custom_field_definitions (field_name, field_label, field_type, category, is_required)
--- VALUES
---     ('affected_server', 'Affected Server', 'text', 'Hardware', false),
---     ('incident_date', 'Incident Date', 'date', 'Security', true),
---     ('software_version', 'Software Version', 'text', 'Software', false);