Initial commit: UDC/CLM parser for ShopDB

Python parsers for Universal Data Collector (UDC) and Control Loop
Monitor (CLM) data from CNC machines.

- clmparser.py: Main parser for CLM JSON data files
  - Incremental imports using file hashes
  - Extracts parts, measurements, tool data, violations
  - Calculates cycle times and changeovers

- udcparser.py: Parser for raw UDC log files
  - Application events, errors, connections

- config.py: Database configuration (dev/prod)
- backfill_changeover.py: One-time migration utility

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

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

parser/backfill_changeover.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+"""Backfill changeover values for udcparts"""
+import mysql.connector
+
+conn = mysql.connector.connect(
+    host='127.0.0.1', port=3306, user='root', 
+    password='rootpassword', database='shopdb'
+)
+cursor = conn.cursor()
+
+# Get all machines
+cursor.execute("SELECT DISTINCT machinenumber FROM udcsessions ORDER BY machinenumber")
+machines = [row[0] for row in cursor.fetchall()]
+
+total_updated = 0
+for machine in machines:
+    # Get all parts for this machine ordered by start time
+    cursor.execute("""
+        SELECT p.partrunid, p.programstart, p.programend
+        FROM udcparts p
+        JOIN udcsessions s ON p.sessionid = s.sessionid
+        WHERE s.machinenumber = %s AND p.programstart IS NOT NULL
+        ORDER BY p.programstart ASC
+    """, (machine,))
+    parts = cursor.fetchall()
+    
+    prev_end = None
+    updates = []
+    for partrunid, programstart, programend in parts:
+        if prev_end and programstart:
+            changeover = int((programstart - prev_end).total_seconds())
+            # Only set if reasonable (> 0 and < 24 hours)
+            if 0 < changeover < 86400:
+                updates.append((changeover, partrunid))
+        prev_end = programend if programend else prev_end
+    
+    # Batch update
+    if updates:
+        cursor.executemany("UPDATE udcparts SET changeover = %s WHERE partrunid = %s", updates)
+        conn.commit()
+        total_updated += len(updates)
+    
+    print(f"Machine {machine}: {len(updates)} changeovers set")
+
+print(f"\nTotal updated: {total_updated}")
+cursor.close()
+conn.close()