Complete rewrite: SnapRAID SMART logger with BackBlaze algorithm

Fetches SMART data from Scrutiny's InfluxDB and calculates failure
probabilities using the exact BackBlaze tables from SnapRAID source.

Key features:
- Calculates both v12 (with attr 193) and v13 (without attr 193) algorithms
- v12 matches SnapRAID pre-v13.0 (includes Load Cycle Count)
- v13 matches modern SnapRAID v13.0+ (excludes Load Cycle Count)
- Stores both values for trending and comparison
- Correctly applies bit masks (16-bit for 187/188, 32-bit for others)
- Annualizes monthly rates and applies Poisson distribution
- Logs to PostgreSQL with device metadata

Solved the mystery: SnapRAID v12 uses attribute 193 which was removed
in v13.0. Load cycle count has massive impact on failure predictions
for some drives (80% vs 4% difference).

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

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

populate_devices_final.sql

@@ -0,0 +1,149 @@
+-- Populate devices table with actual drive data
+-- Based on device_mappings.txt and snapraid smart output
+
+-- Device 1: /dev/sda [parity]
+INSERT INTO devices (device_wwn, device_path, serial_number, model, manufacturer, capacity_bytes, size_tb, disk_role, notes)
+VALUES (
+    '0x5000c500744487c5',
+    '/dev/sda',
+    'ZX20AAMV',
+    'WDC WD200EFAX',
+    'Western Digital',
+    20000000000000,
+    20.0,
+    'parity',
+    'Parity drive - 636 days old'
+);
+
+-- Device 2: /dev/sdb [d2]
+INSERT INTO devices (device_wwn, device_path, serial_number, model, manufacturer, capacity_bytes, size_tb, disk_role, notes)
+VALUES (
+    '0x5000c500e7a6a520',
+    '/dev/sdb',
+    'ZX22EJ3Y',
+    'WDC WD200EFAX',
+    'Western Digital',
+    20000000000000,
+    20.0,
+    'd2',
+    'Data drive 2 - 637 days old'
+);
+
+-- Device 3: /dev/sdc [d1]
+INSERT INTO devices (device_wwn, device_path, serial_number, model, manufacturer, capacity_bytes, size_tb, disk_role, notes)
+VALUES (
+    '0x5000c500c570663e',
+    '/dev/sdc',
+    'ZLW0A3QJ',
+    'WDC WD120EFAX',
+    'Western Digital',
+    12000000000000,
+    12.0,
+    'd1',
+    'Data drive 1 - 1968 days old - HIGH RISK 81%'
+);
+
+-- Device 4: /dev/sdd [d5]
+INSERT INTO devices (device_wwn, device_path, serial_number, model, manufacturer, capacity_bytes, size_tb, disk_role, notes)
+VALUES (
+    '0x5000c500e584b9c8',
+    '/dev/sdd',
+    'ZTN1BNEZ',
+    'WDC WD120EFAX',
+    'Western Digital',
+    12000000000000,
+    12.0,
+    'd5',
+    'Data drive 5 - 1014 days old'
+);
+
+-- Device 5: /dev/sde (unused)
+INSERT INTO devices (device_wwn, device_path, serial_number, model, manufacturer, capacity_bytes, size_tb, disk_role, notes)
+VALUES (
+    '0x5000cca234c69287',
+    '/dev/sde',
+    'YVGGG6EC',
+    'WDC WD30EFRX',
+    'Western Digital',
+    3000000000000,
+    3.0,
+    '-',
+    'Unused drive - 1983 days old'
+);
+
+-- Device 6: /dev/sdf (unused)
+INSERT INTO devices (device_wwn, device_path, serial_number, model, manufacturer, capacity_bytes, size_tb, disk_role, notes)
+VALUES (
+    '0x5000c500c455c45e',
+    '/dev/sdf',
+    'ZA1GX9F4',
+    'WDC WD80EFAX',
+    'Western Digital',
+    8000000000000,
+    8.0,
+    '-',
+    'Unused drive - 2072 days old - HIGH RISK 84%'
+);
+
+-- Device 7: /dev/sdg [2-parity]
+INSERT INTO devices (device_wwn, device_path, serial_number, model, manufacturer, capacity_bytes, size_tb, disk_role, notes)
+VALUES (
+    '0x5000cca26ae062f3',
+    '/dev/sdg',
+    '2TJ97M6D',
+    'WDC WD100EFAX',
+    'Western Digital',
+    10000000000000,
+    10.0,
+    '2-parity',
+    'Second parity drive - 2540 days old'
+);
+
+-- Device 8: /dev/sdh [2-parity]
+INSERT INTO devices (device_wwn, device_path, serial_number, model, manufacturer, capacity_bytes, size_tb, disk_role, notes)
+VALUES (
+    '0x5000cca266e83d77',
+    '/dev/sdh',
+    '7JJVJ65C',
+    'WDC WD100EFAX',
+    'Western Digital',
+    10000000000000,
+    10.0,
+    '2-parity',
+    'Second parity drive - 2354 days old - 1 error reported'
+);
+
+-- Device 9: /dev/sdi (unused)
+INSERT INTO devices (device_wwn, device_path, serial_number, model, manufacturer, capacity_bytes, size_tb, disk_role, notes)
+VALUES (
+    '0x5000c500c46b0832',
+    '/dev/sdi',
+    'ZA1GW0XM',
+    'WDC WD80EFAX',
+    'Western Digital',
+    8000000000000,
+    8.0,
+    '-',
+    'Unused drive - 2074 days old - HIGH RISK 84%'
+);
+
+-- Device 10: /dev/nvme0n1 [OS drive] - Note: WWN format different for NVMe
+-- NVMe devices may not report WWN in the same format, skipping for now
+-- You can add this manually if needed after checking actual WWN from InfluxDB
+-- INSERT INTO devices (device_wwn, device_path, serial_number, model, manufacturer, capacity_bytes, size_tb, disk_role, notes)
+-- VALUES (
+--     '25243x801438',  -- May need different format
+--     '/dev/nvme0n1',
+--     '25243X801438',
+--     'NVMe SSD',
+--     'Unknown',
+--     NULL,
+--     NULL,
+--     'os',
+--     'Operating system drive'
+-- );
+
+-- Verify the data
+SELECT device_path, serial_number, size_tb, disk_role, notes
+FROM devices
+ORDER BY device_path;