chore: docs and scripts organized. clutter cleared.

archive/legacy_migrations/migrate_add_measurement_start_time.py

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+#!/usr/bin/env python3
+"""
+Database migration: Add measurement_start_time field to nl43_status table
+
+This tracks when a measurement session started by detecting the state transition
+from "Stop" to "Measure", enabling accurate elapsed time display even for
+manually-started measurements.
+"""
+
+import sqlite3
+import sys
+
+DB_PATH = "data/slmm.db"
+
+def migrate():
+    print(f"Adding measurement_start_time field to: {DB_PATH}")
+
+    try:
+        conn = sqlite3.connect(DB_PATH)
+        cursor = conn.cursor()
+
+        # Check if measurement_start_time column already exists
+        cursor.execute("PRAGMA table_info(nl43_status)")
+        columns = [row[1] for row in cursor.fetchall()]
+
+        if 'measurement_start_time' in columns:
+            print("✓ measurement_start_time column already exists, no migration needed")
+            conn.close()
+            return
+
+        print("Starting migration...")
+
+        # Add measurement_start_time column
+        cursor.execute("""
+            ALTER TABLE nl43_status
+            ADD COLUMN measurement_start_time TEXT
+        """)
+
+        conn.commit()
+        print("✓ Added measurement_start_time column")
+
+        # Verify
+        cursor.execute("PRAGMA table_info(nl43_status)")
+        columns = [row[1] for row in cursor.fetchall()]
+
+        if 'measurement_start_time' not in columns:
+            raise Exception("measurement_start_time column was not added successfully")
+
+        print("✓ Migration completed successfully")
+
+        conn.close()
+
+    except Exception as e:
+        print(f"✗ Migration failed: {e}")
+        sys.exit(1)
+
+if __name__ == "__main__":
+    migrate()