infra: add clickhouse storage and schema initialization

infrastructure/clickhouse/init.sql

@@ -2,31 +2,39 @@ 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,
 
-    processed_at DateTime64(3) DEFAULT now()
+    -- Audit
+    processed_at DateTime64(3) DEFAULT now64(3)
 )
 ENGINE = ReplacingMergeTree(processed_at)
 PARTITION BY toYYYYMM(session_start_time)
-ORDER BY (
+ORDER BY
+(
     service_type,
     radio_access_type,
     cell_id,