-- Migration 001: Add RAM statistics and SMART data table
-- Date: 2025-12-07
-- Description: Adds used_mb, free_mb, shared_mb to hardware_snapshots and creates disk_smart_data table

-- Add new RAM columns to hardware_snapshots
ALTER TABLE hardware_snapshots ADD COLUMN ram_used_mb INTEGER;
ALTER TABLE hardware_snapshots ADD COLUMN ram_free_mb INTEGER;
ALTER TABLE hardware_snapshots ADD COLUMN ram_shared_mb INTEGER;

-- Create disk_smart_data table
CREATE TABLE IF NOT EXISTS disk_smart_data (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    hardware_snapshot_id INTEGER NOT NULL,
    captured_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,

    -- Disk identification
    device_name VARCHAR(50) NOT NULL,
    model VARCHAR(255),
    serial_number VARCHAR(100),
    size_gb REAL,
    disk_type VARCHAR(20),  -- 'ssd' or 'hdd'
    interface VARCHAR(50),  -- 'sata', 'nvme', 'usb'

    -- SMART Health Status
    health_status VARCHAR(20),  -- 'PASSED', 'FAILED', or NULL
    temperature_celsius INTEGER,

    -- Aging indicators
    power_on_hours INTEGER,
    power_cycle_count INTEGER,
    reallocated_sectors INTEGER,  -- Critical: bad sectors
    pending_sectors INTEGER,  -- Very critical: imminent failure
    udma_crc_errors INTEGER,  -- Cable/interface issues

    -- SSD-specific
    wear_leveling_count INTEGER,  -- 0-100 (higher is better)
    total_lbas_written REAL,  -- Total data written

    FOREIGN KEY (hardware_snapshot_id) REFERENCES hardware_snapshots(id) ON DELETE CASCADE
);

CREATE INDEX IF NOT EXISTS idx_disk_smart_hardware_snapshot ON disk_smart_data(hardware_snapshot_id);
CREATE INDEX IF NOT EXISTS idx_disk_smart_device ON disk_smart_data(device_name);