CREATE TABLE subscriber (
-- OsmoHLR's DB scheme is modelled roughly after TS 23.008 version 13.3.0
	id		INTEGER PRIMARY KEY,
	-- Chapter 2.1.1.1
	imsi		VARCHAR(15) UNIQUE NOT NULL,
	-- Chapter 2.1.2
	msisdn		VARCHAR(15) UNIQUE,
	-- Chapter 2.2.3: Most recent / current IMEISV
	imeisv		VARCHAR,
	-- Chapter 2.1.9: Most recent / current IMEI
	imei		VARCHAR(14),
	-- Chapter 2.4.5
	vlr_number	VARCHAR(15),
	-- Chapter 2.4.6
	hlr_number	VARCHAR(15),
	-- Chapter 2.4.8.1
	sgsn_number	VARCHAR(15),
	-- Chapter 2.13.10
	sgsn_address	VARCHAR,
	-- Chapter 2.4.8.2
	ggsn_number	VARCHAR(15),
	-- Chapter 2.4.9.2
	gmlc_number	VARCHAR(15),
	-- Chapter 2.4.23
	smsc_number	VARCHAR(15),
	-- Chapter 2.4.24
	periodic_lu_tmr	INTEGER,
	-- Chapter 2.13.115
	periodic_rau_tau_tmr INTEGER,
	-- Chapter 2.1.1.2: network access mode
	nam_cs		BOOLEAN NOT NULL DEFAULT 1,
	nam_ps		BOOLEAN NOT NULL DEFAULT 1,
	-- Chapter 2.1.8
	lmsi		INTEGER,

	-- The below purged flags might not even be stored non-volatile,
	-- refer to TS 23.012 Chapter 3.6.1.4
	-- Chapter 2.7.5
	ms_purged_cs	BOOLEAN NOT NULL DEFAULT 0,
	-- Chapter 2.7.6
	ms_purged_ps	BOOLEAN NOT NULL DEFAULT 0,

	-- Timestamp of last location update seen from subscriber
	-- The value is a string which encodes a UTC timestamp in granularity of seconds.
	last_lu_seen TIMESTAMP default NULL,

	-- Last Radio Access Type list as sent during Location Updating Request.
	-- This is usually just one RAT name, but can be a comma separated list of strings
	-- of all the RAT types sent during Location Updating Request.
	last_lu_rat	TEXT default NULL
);

CREATE TABLE subscriber_apn (
	subscriber_id	INTEGER,		-- subscriber.id
	apn		VARCHAR(256) NOT NULL
);

CREATE TABLE subscriber_multi_msisdn (
-- Chapter 2.1.3
	subscriber_id	INTEGER,		-- subscriber.id
	msisdn		VARCHAR(15) NOT NULL
);

CREATE TABLE auc_2g (
	subscriber_id	INTEGER PRIMARY KEY,	-- subscriber.id
	algo_id_2g	INTEGER NOT NULL,	-- enum osmo_auth_algo value
	ki		VARCHAR(32) NOT NULL	-- hex string: subscriber's secret key (128bit)
);

CREATE TABLE auc_3g (
	subscriber_id	INTEGER PRIMARY KEY,	-- subscriber.id
	algo_id_3g	INTEGER NOT NULL,	-- enum osmo_auth_algo value
	k		VARCHAR(32) NOT NULL,	-- hex string: subscriber's secret key (128bit)
	op		VARCHAR(32),		-- hex string: operator's secret key (128bit)
	opc		VARCHAR(32),		-- hex string: derived from OP and K (128bit)
	sqn		INTEGER NOT NULL DEFAULT 0,	-- sequence number of key usage
	ind_bitlen	INTEGER NOT NULL DEFAULT 5	-- nr of index bits at lower SQN end
);

-- Optional: add subscriber entries to allow or disallow specific RATs (2G or 3G or ...).
-- If a subscriber has no entry, that means that all RATs are allowed (backwards compat).
CREATE TABLE subscriber_rat (
	subscriber_id	INTEGER,		-- subscriber.id
	rat		TEXT CHECK(rat in ('GERAN-A', 'UTRAN-Iu','EUTRAN-SGs')) NOT NULL,	-- Radio Access Technology, see enum ran_type
	allowed		BOOLEAN CHECK(allowed in (0, 1)) NOT NULL DEFAULT 0
);

CREATE UNIQUE INDEX idx_subscr_imsi ON subscriber (imsi);
CREATE UNIQUE INDEX idx_subscr_rat_flag ON subscriber_rat (subscriber_id, rat);

-- Set HLR database schema version number
-- Note: This constant is currently duplicated in src/db.c and must be kept in sync!
PRAGMA user_version = 4;