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.sql

@@ -0,0 +1,87 @@
+-- Populate devices table with your drive metadata
+-- Replace the placeholder values with actual information from your drives
+
+-- Device 1: WWN 0x5000c500744487c5
+INSERT INTO devices (device_wwn, device_path, serial_number, model, manufacturer, capacity_bytes, size_tb, disk_role, notes)
+VALUES (
+    '0x5000c500744487c5',
+    '/dev/sdc',           -- Update with actual device path
+    'ZLW0A3QJ',          -- Update with actual serial
+    'WDC WD120EFAX',     -- Update with actual model
+    'Western Digital',   -- Update with manufacturer
+    12000000000000,      -- Update with capacity in bytes
+    12.0,                -- Size in TB
+    'd1',                -- SnapRAID role (d1, d2, parity, 2-parity, or '-' for unused)
+    'Data drive 1'       -- Optional notes
+);
+
+-- Device 2: WWN 0x5000c500c455c45e
+INSERT INTO devices (device_wwn, device_path, serial_number, model, manufacturer, capacity_bytes, size_tb, disk_role, notes)
+VALUES (
+    '0x5000c500c455c45e',
+    '/dev/sdb',
+    'ZX22EJ3Y',
+    'WDC WD200EFAX',
+    'Western Digital',
+    20000000000000,
+    20.0,
+    'd2',
+    'Data drive 2'
+);
+
+-- Device 3: WWN 0x5000c500c46b0832
+INSERT INTO devices (device_wwn, device_path, serial_number, model, manufacturer, capacity_bytes, size_tb, disk_role, notes)
+VALUES (
+    '0x5000c500c46b0832',
+    '/dev/sdd',
+    'ZTN1BNEZ',
+    'WDC WD120EFAX',
+    'Western Digital',
+    12000000000000,
+    12.0,
+    'd5',
+    'Data drive 5'
+);
+
+-- Device 4: WWN 0x5000c500c570663e
+INSERT INTO devices (device_wwn, device_path, serial_number, model, manufacturer, capacity_bytes, size_tb, disk_role, notes)
+VALUES (
+    '0x5000c500c570663e',
+    '/dev/sda',
+    'ZX20AAMV',
+    'WDC WD200EFAX',
+    'Western Digital',
+    20000000000000,
+    20.0,
+    'parity',
+    'Parity drive'
+);
+
+-- Device 5: WWN 0x5000c500e584b9c8
+INSERT INTO devices (device_wwn, device_path, serial_number, model, manufacturer, capacity_bytes, size_tb, disk_role, notes)
+VALUES (
+    '0x5000c500e584b9c8',
+    '/dev/sdg',
+    '2TJ97M6D',
+    'WDC WD100EFAX',
+    'Western Digital',
+    10000000000000,
+    10.0,
+    '2-parity',
+    'Second parity drive'
+);
+
+-- Add remaining 4 devices following the same pattern
+-- Template:
+-- INSERT INTO devices (device_wwn, device_path, serial_number, model, manufacturer, capacity_bytes, size_tb, disk_role, notes)
+-- VALUES (
+--     '0xXXXXXXXXXXXXXXXX',  -- WWN from InfluxDB
+--     '/dev/sdX',            -- Device path
+--     'SERIAL',              -- Serial number from snapraid smart or smartctl
+--     'MODEL',               -- Model number
+--     'MANUFACTURER',        -- Manufacturer name
+--     0,                     -- Capacity in bytes
+--     0.0,                   -- Size in TB
+--     '-',                   -- SnapRAID role
+--     ''                     -- Notes
+-- );