-- PostgreSQL schema for SMART data logging

-- Main table for SMART metrics snapshots
CREATE TABLE IF NOT EXISTS smart_metrics (
    id BIGSERIAL PRIMARY KEY,
    timestamp TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    device_path VARCHAR(255) NOT NULL,
    serial_number VARCHAR(255) NOT NULL,
    model VARCHAR(255),
    disk_role VARCHAR(50),  -- e.g., 'd1', 'd2', 'parity', '2-parity', or '-' for unused

    -- Basic metrics (from SnapRAID smart output)
    temperature_celsius INTEGER,
    power_on_days INTEGER,
    error_count INTEGER,
    size_tb DECIMAL(10, 2),

    -- Calculated failure probability
    failure_probability_pct DECIMAL(5, 2),  -- 0.00 to 100.00

    -- Raw SMART attributes (key-value pairs as JSONB)
    smart_attributes JSONB,

    -- Indexes for efficient querying
    CONSTRAINT unique_device_timestamp UNIQUE (device_path, timestamp)
);

-- Index on serial number for device history queries
CREATE INDEX IF NOT EXISTS idx_smart_metrics_serial ON smart_metrics(serial_number);

-- Index on timestamp for time-range queries
CREATE INDEX IF NOT EXISTS idx_smart_metrics_timestamp ON smart_metrics(timestamp DESC);

-- Index on device_path for per-device queries
CREATE INDEX IF NOT EXISTS idx_smart_metrics_device ON smart_metrics(device_path);

-- Index on JSONB attributes for querying specific SMART values
CREATE INDEX IF NOT EXISTS idx_smart_attributes_gin ON smart_metrics USING gin (smart_attributes);

-- View for latest metrics per device
CREATE OR REPLACE VIEW smart_latest AS
SELECT DISTINCT ON (device_path)
    *
FROM smart_metrics
ORDER BY device_path, timestamp DESC;

-- View for high-risk devices (failure probability > 50%)
CREATE OR REPLACE VIEW smart_high_risk AS
SELECT *
FROM smart_latest
WHERE failure_probability_pct > 50.0
ORDER BY failure_probability_pct DESC;

COMMENT ON TABLE smart_metrics IS 'Historical SMART metrics collected from Scrutiny InfluxDB';
COMMENT ON COLUMN smart_metrics.failure_probability_pct IS 'BackBlaze-based 1-year failure probability (0-100%)';
COMMENT ON COLUMN smart_metrics.smart_attributes IS 'Raw SMART attributes as JSON (attribute_id -> value)';
COMMENT ON VIEW smart_latest IS 'Latest SMART metrics for each device';
COMMENT ON VIEW smart_high_risk IS 'Devices with >50% annual failure probability';