CREATE DATABASE IF NOT EXISTS telecom;

CREATE TABLE IF NOT EXISTS telecom.cdr_records
(
    -- Identifiers
    cdr_id UUID,
    raw_id String,

    -- Subscriber
    msisdn String,
    imsi String,

    -- Session metadata
    service_type LowCardinality(String),
    radio_access_type LowCardinality(String),
    cell_id LowCardinality(String),

    -- Traffic
    bytes_uploaded UInt64,
    bytes_downloaded UInt64,
    total_bytes UInt64,
    duration_seconds UInt32,

    -- Timing
    session_start_time DateTime,
    session_end_time DateTime,

    -- Network
    source_ip IPv4,

    -- Audit
    processed_at DateTime64(3) DEFAULT now64(3)
)
ENGINE = ReplacingMergeTree(processed_at)
PARTITION BY toYYYYMM(session_start_time)
ORDER BY
(
    service_type,
    radio_access_type,
    cell_id,
    session_start_time,
    msisdn,
    cdr_id
)
TTL session_start_time + INTERVAL 90 DAY
SETTINGS index_granularity = 8192;