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