eDNC: Use machineid instead of hostname for proper FK relationship

- ednclogs table now uses machineid to link to machines table
- Removed redundant hostname storage (derive from machines table)
- Updated LogDNCEvent to look up and insert machineid
- Updated GetDNCStats to join machines table for hostname
- Updated displaypc.asp queries to use machineid directly
- sql/ednc_tables.sql is now a migration script for existing production

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

sql/ednc_tables.sql

@@ -1,41 +1,25 @@
 -- ============================================================================
--- eDNC Special Character Fix - Database Tables
--- Run on PRODUCTION database to enable eDNC logging
--- Created: 2025-12-12
+-- eDNC Special Character Fix - Database Migration
+-- Migrates ednclogs from hostname to machineid (FK to machines table)
+-- Run on PRODUCTION after initial setup
+-- Updated: 2025-12-12
 -- ============================================================================
 
--- Log individual events (cleaned, failed, started, stopped, etc.)
-CREATE TABLE IF NOT EXISTS ednc_logs (
-    logid INT AUTO_INCREMENT PRIMARY KEY,
-    hostname VARCHAR(50) NOT NULL,
-    filename VARCHAR(255) NOT NULL,
-    action ENUM('cleaned', 'ok', 'failed', 'error', 'started', 'stopped') NOT NULL,
-    bytes_removed INT DEFAULT 0,
-    version VARCHAR(20),
-    message VARCHAR(500),
-    created DATETIME DEFAULT CURRENT_TIMESTAMP,
-    INDEX idx_hostname (hostname),
-    INDEX idx_created (created),
-    INDEX idx_action (action)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+-- Step 1: Add machineid column to ednclogs
+ALTER TABLE ednclogs
+ADD COLUMN machineid INT NOT NULL AFTER logid,
+ADD INDEX idx_machineid (machineid);
 
--- Track installations per PC
-CREATE TABLE IF NOT EXISTS ednc_installations (
-    installid INT AUTO_INCREMENT PRIMARY KEY,
-    hostname VARCHAR(50) NOT NULL UNIQUE,
-    version VARCHAR(20),
-    watch_folder VARCHAR(255),
-    file_filter VARCHAR(50),
-    first_seen DATETIME DEFAULT CURRENT_TIMESTAMP,
-    last_seen DATETIME DEFAULT CURRENT_TIMESTAMP,
-    is_active TINYINT(1) DEFAULT 1,
-    total_cleaned INT DEFAULT 0,
-    total_failed INT DEFAULT 0,
-    INDEX idx_hostname (hostname),
-    INDEX idx_active (is_active)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+-- Step 2: Populate machineid from hostname (match existing PCs)
+UPDATE ednclogs l
+INNER JOIN machines m ON UPPER(m.hostname) = UPPER(l.hostname)
+SET l.machineid = m.machineid
+WHERE m.pctypeid IS NOT NULL;
 
--- Verify tables created
-SELECT 'ednc_logs' AS table_name, COUNT(*) AS row_count FROM ednc_logs
-UNION ALL
-SELECT 'ednc_installations', COUNT(*) FROM ednc_installations;
+-- Step 3: Remove hostname column and index
+ALTER TABLE ednclogs DROP INDEX idx_hostname;
+ALTER TABLE ednclogs DROP COLUMN hostname;
+
+-- Verify migration
+SELECT 'Migration complete' AS status;
+DESCRIBE ednclogs;