-- ClickHouse Initialization Script for Telecom CDR Ingestion Pipeline
-- Database: telecom
-- Table: telecom.cdr_records

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 now()

) ENGINE = ReplacingMergeTree(processed_at)
PARTITION BY toYYYYMM(session_start_time)
ORDER BY (service_type, radio_access_type, cell_id, session_start_time, msisdn)
TTL session_start_time + INTERVAL 90 DAY
SETTINGS index_granularity = 8192;