Major schema refactoring: simplify ASN and prefix tracking

- Remove UUID primary keys from ASNs table, use ASN number as primary key
- Update announcements table to reference ASN numbers directly
- Rename asns.number column to asns.asn for consistency
- Add prefix tracking to PrefixHandler to populate prefixes_v4/v6 tables
- Add UpdatePrefixesBatch method for efficient batch updates
- Update all database methods and models to use new schema
- Fix all references in code to use ASN field instead of Number
- Update test mocks to match new interfaces

internal/database/schema.sql

@@ -3,8 +3,7 @@
 -- DO NOT make schema changes anywhere else in the codebase.
 
 CREATE TABLE IF NOT EXISTS asns (
-	id TEXT PRIMARY KEY,
-	number INTEGER UNIQUE NOT NULL,
+	asn INTEGER PRIMARY KEY,
 	handle TEXT,
 	description TEXT,
 	first_seen DATETIME NOT NULL,
@@ -30,15 +29,14 @@ CREATE TABLE IF NOT EXISTS prefixes_v6 (
 CREATE TABLE IF NOT EXISTS announcements (
 	id TEXT PRIMARY KEY,
 	prefix_id TEXT NOT NULL,
-	asn_id TEXT NOT NULL,
-	origin_asn_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 (prefix_id) REFERENCES prefixes(id),
-	FOREIGN KEY (asn_id) REFERENCES asns(id),
-	FOREIGN KEY (origin_asn_id) REFERENCES asns(id)
+	FOREIGN KEY (peer_asn) REFERENCES asns(asn),
+	FOREIGN KEY (origin_asn) REFERENCES asns(asn)
 );
 
 CREATE TABLE IF NOT EXISTS peerings (
@@ -67,13 +65,14 @@ CREATE INDEX IF NOT EXISTS idx_prefixes_v4_prefix ON prefixes_v4(prefix);
 CREATE INDEX IF NOT EXISTS idx_prefixes_v6_prefix ON prefixes_v6(prefix);
 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_asn_id ON announcements(asn_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_number ON asns(number);
+CREATE INDEX IF NOT EXISTS idx_asns_asn ON asns(asn);
 
 -- Indexes for bgp_peers table
 CREATE INDEX IF NOT EXISTS idx_bgp_peers_asn ON bgp_peers(peer_asn);