-- IMPORTANT: This is the ONLY place where schema changes should be made.
-- We do NOT support migrations. All schema changes MUST be in this file.
-- DO NOT make schema changes anywhere else in the codebase.

CREATE TABLE IF NOT EXISTS asns (
	asn INTEGER PRIMARY KEY,
	handle TEXT,
	description TEXT,
	-- WHOIS parsed fields
	as_name TEXT,
	org_name TEXT,
	org_id TEXT,
	address TEXT,                -- full address (may be multi-line)
	country_code TEXT,
	abuse_email TEXT,
	abuse_phone TEXT,
	tech_email TEXT,
	tech_phone TEXT,
	rir TEXT,                    -- ARIN, RIPE, APNIC, LACNIC, AFRINIC
	rir_registration_date DATETIME,
	rir_last_modified DATETIME,
	-- Raw WHOIS response
	whois_raw TEXT,              -- complete WHOIS response text
	-- Timestamps
	first_seen DATETIME NOT NULL,
	last_seen DATETIME NOT NULL,
	whois_updated_at DATETIME    -- when we last fetched WHOIS data
);

-- IPv4 prefixes table. Every read and write finds a row by its prefix, so the
-- rows are stored by prefix (WITHOUT ROWID) and need no index of their own.
CREATE TABLE IF NOT EXISTS prefixes_v4 (
	prefix TEXT PRIMARY KEY,
	first_seen DATETIME NOT NULL
) WITHOUT ROWID;

-- IPv6 prefixes table, stored as prefixes_v4 is.
CREATE TABLE IF NOT EXISTS prefixes_v6 (
	prefix TEXT PRIMARY KEY,
	first_seen DATETIME NOT NULL
) WITHOUT ROWID;

CREATE TABLE IF NOT EXISTS announcements (
	id TEXT PRIMARY KEY,
	prefix_id TEXT NOT NULL,
	peer_asn INTEGER NOT NULL,
	origin_asn INTEGER NOT NULL,
	path TEXT NOT NULL,
	next_hop TEXT,
	timestamp DATETIME NOT NULL,
	is_withdrawal BOOLEAN NOT NULL DEFAULT 0,
	FOREIGN KEY (peer_asn) REFERENCES asns(asn),
	FOREIGN KEY (origin_asn) REFERENCES asns(asn)
);

CREATE TABLE IF NOT EXISTS peerings (
	id TEXT PRIMARY KEY,
	as_a INTEGER NOT NULL,
	as_b INTEGER NOT NULL,
	first_seen DATETIME NOT NULL,
	last_seen DATETIME NOT NULL,
	UNIQUE(as_a, as_b)
);

-- BGP peers that send us messages
CREATE TABLE IF NOT EXISTS bgp_peers (
	id TEXT PRIMARY KEY,
	peer_ip TEXT UNIQUE NOT NULL,
	peer_asn INTEGER NOT NULL,
	first_seen DATETIME NOT NULL,
	last_seen DATETIME NOT NULL,
	last_message_type TEXT
);

CREATE INDEX IF NOT EXISTS idx_announcements_timestamp ON announcements(timestamp);
CREATE INDEX IF NOT EXISTS idx_announcements_prefix_id ON announcements(prefix_id);
CREATE INDEX IF NOT EXISTS idx_announcements_peer_asn ON announcements(peer_asn);
CREATE INDEX IF NOT EXISTS idx_announcements_origin_asn ON announcements(origin_asn);
CREATE INDEX IF NOT EXISTS idx_peerings_as_a ON peerings(as_a);
CREATE INDEX IF NOT EXISTS idx_peerings_as_b ON peerings(as_b);
CREATE INDEX IF NOT EXISTS idx_peerings_lookup ON peerings(as_a, as_b);

-- Indexes for asns table
CREATE INDEX IF NOT EXISTS idx_asns_asn ON asns(asn);
CREATE INDEX IF NOT EXISTS idx_asns_whois_updated_at ON asns(whois_updated_at);

-- Indexes for bgp_peers table
CREATE INDEX IF NOT EXISTS idx_bgp_peers_asn ON bgp_peers(peer_asn);
CREATE INDEX IF NOT EXISTS idx_bgp_peers_last_seen ON bgp_peers(last_seen);
CREATE INDEX IF NOT EXISTS idx_bgp_peers_ip ON bgp_peers(peer_ip);

-- IPv4 routing table maintained by PrefixHandler. A route write changes the
-- table and its entry in every index on a column the write sets, so the table
-- has only the indexes that the queries named with them use.
CREATE TABLE IF NOT EXISTS live_routes_v4 (
	-- The row id, which the prefix-length pages' sample draws through the
	-- mask_length index. Declared as a column, it stays the same for as long
	-- as the route is live, also through a VACUUM.
	id INTEGER PRIMARY KEY,
	prefix TEXT NOT NULL,
	mask_length INTEGER NOT NULL, -- CIDR mask length (0-32)
	origin_asn INTEGER NOT NULL,
	peer_ip TEXT NOT NULL,
	as_path TEXT NOT NULL, -- JSON array
	next_hop TEXT NOT NULL,
	last_updated DATETIME NOT NULL,
	-- A peer has at most one route for a prefix. This key finds the route a
	-- write updates or deletes and, peer_ip coming first, all of a peer's
	-- routes when its BGP session goes down.
	UNIQUE(peer_ip, prefix)
);

-- IPv6 routing table maintained by PrefixHandler, as live_routes_v4.
CREATE TABLE IF NOT EXISTS live_routes_v6 (
	id INTEGER PRIMARY KEY,
	prefix TEXT NOT NULL,
	mask_length INTEGER NOT NULL, -- CIDR mask length (0-128)
	origin_asn INTEGER NOT NULL,
	peer_ip TEXT NOT NULL,
	as_path TEXT NOT NULL, -- JSON array
	next_hop TEXT NOT NULL,
	last_updated DATETIME NOT NULL,
	UNIQUE(peer_ip, prefix)
);

-- Indexes for both live route tables, and the queries that use each.
--
-- prefix, last_updated: a prefix's routes, for the prefix page and its API
-- answer, the IP lookup and its peer count, and the check whether a prefix
-- still has a live route; and a prefix's newest route for the prefix-length
-- pages, in one search whatever the number of peers.
CREATE INDEX IF NOT EXISTS idx_live_routes_v4_prefix_last_updated ON live_routes_v4(prefix, last_updated);
CREATE INDEX IF NOT EXISTS idx_live_routes_v6_prefix_last_updated ON live_routes_v6(prefix, last_updated);
-- mask_length: the prefix-length pages' random sample, the row id range of a
-- mask length and the first route of it at or after a row id.
CREATE INDEX IF NOT EXISTS idx_live_routes_v4_mask_length ON live_routes_v4(mask_length);
CREATE INDEX IF NOT EXISTS idx_live_routes_v6_mask_length ON live_routes_v6(mask_length);
-- mask_length, prefix: the prefix-length pages' list of a mask length's
-- prefixes in text order, and the prefix distribution read at startup.
CREATE INDEX IF NOT EXISTS idx_live_routes_v4_mask_prefix ON live_routes_v4(mask_length, prefix);
CREATE INDEX IF NOT EXISTS idx_live_routes_v6_mask_prefix ON live_routes_v6(mask_length, prefix);
-- origin_asn: the prefixes an AS originates, for the AS page and its API answer.
CREATE INDEX IF NOT EXISTS idx_live_routes_v4_origin_asn ON live_routes_v4(origin_asn);
CREATE INDEX IF NOT EXISTS idx_live_routes_v6_origin_asn ON live_routes_v6(origin_asn);
-- last_updated: the oldest and newest route times in /api/v1/stats and
-- /status.json.
CREATE INDEX IF NOT EXISTS idx_live_routes_v4_last_updated ON live_routes_v4(last_updated);
CREATE INDEX IF NOT EXISTS idx_live_routes_v6_last_updated ON live_routes_v6(last_updated);