Simplify peerings table to store AS numbers directly

- Rename asn_peerings table to peerings
- Change columns from from_asn_id/to_asn_id to as_a/as_b (integers)
- Remove foreign key constraints to asns table
- Update RecordPeering to use AS numbers directly
- Add validation in RecordPeering to ensure:
  - Both AS numbers are > 0
  - AS numbers are different
  - as_a is always lower than as_b (normalized)
- Update PeeringHandler to no longer need ASN cache
- Simplify the code by removing unnecessary ASN lookups

internal/database/database.go

@@ -254,7 +254,20 @@ func (d *Database) RecordAnnouncement(announcement *Announcement) error {
 }
 
 // RecordPeering records a peering relationship between two ASNs.
-func (d *Database) RecordPeering(fromASNID, toASNID string, timestamp time.Time) error {
+func (d *Database) RecordPeering(asA, asB int, timestamp time.Time) error {
+	// Validate ASNs
+	if asA <= 0 || asB <= 0 {
+		return fmt.Errorf("invalid ASN: asA=%d, asB=%d", asA, asB)
+	}
+	if asA == asB {
+		return fmt.Errorf("cannot create peering with same ASN: %d", asA)
+	}
+
+	// Normalize: ensure asA < asB
+	if asA > asB {
+		asA, asB = asB, asA
+	}
+
 	tx, err := d.beginTx()
 	if err != nil {
 		return err
@@ -266,20 +279,20 @@ func (d *Database) RecordPeering(fromASNID, toASNID string, timestamp time.Time)
 	}()
 
 	var exists bool
-	err = tx.QueryRow("SELECT EXISTS(SELECT 1 FROM asn_peerings WHERE from_asn_id = ? AND to_asn_id = ?)",
-		fromASNID, toASNID).Scan(&exists)
+	err = tx.QueryRow("SELECT EXISTS(SELECT 1 FROM peerings WHERE as_a = ? AND as_b = ?)",
+		asA, asB).Scan(&exists)
 	if err != nil {
 		return err
 	}
 
 	if exists {
-		_, err = tx.Exec("UPDATE asn_peerings SET last_seen = ? WHERE from_asn_id = ? AND to_asn_id = ?",
-			timestamp, fromASNID, toASNID)
+		_, err = tx.Exec("UPDATE peerings SET last_seen = ? WHERE as_a = ? AND as_b = ?",
+			timestamp, asA, asB)
 	} else {
 		_, err = tx.Exec(`
-			INSERT INTO asn_peerings (id, from_asn_id, to_asn_id, first_seen, last_seen)
+			INSERT INTO peerings (id, as_a, as_b, first_seen, last_seen)
 			VALUES (?, ?, ?, ?, ?)`,
-			generateUUID().String(), fromASNID, toASNID, timestamp, timestamp)
+			generateUUID().String(), asA, asB, timestamp, timestamp)
 	}
 	if err != nil {
 		return err
@@ -287,8 +300,8 @@ func (d *Database) RecordPeering(fromASNID, toASNID string, timestamp time.Time)
 
 	if err = tx.Commit(); err != nil {
 		d.logger.Error("Failed to commit transaction for peering",
-			"from_asn_id", fromASNID,
-			"to_asn_id", toASNID,
+			"as_a", asA,
+			"as_b", asB,
 			"error", err,
 		)
 
@@ -374,7 +387,7 @@ func (d *Database) GetStats() (Stats, error) {
 	}
 
 	// Count peerings
-	err = d.queryRow("SELECT COUNT(*) FROM asn_peerings").Scan(&stats.Peerings)
+	err = d.queryRow("SELECT COUNT(*) FROM peerings").Scan(&stats.Peerings)
 	if err != nil {
 		return stats, err
 	}

internal/database/interface.go

@@ -29,7 +29,7 @@ type Store interface {
 	RecordAnnouncement(announcement *Announcement) error
 
 	// Peering operations
-	RecordPeering(fromASNID, toASNID string, timestamp time.Time) error
+	RecordPeering(asA, asB int, timestamp time.Time) error
 
 	// Statistics
 	GetStats() (Stats, error)

internal/database/schema.sql

@@ -29,15 +29,13 @@ CREATE TABLE IF NOT EXISTS announcements (
 	FOREIGN KEY (origin_asn_id) REFERENCES asns(id)
 );
 
-CREATE TABLE IF NOT EXISTS asn_peerings (
+CREATE TABLE IF NOT EXISTS peerings (
 	id TEXT PRIMARY KEY,
-	from_asn_id TEXT NOT NULL,
-	to_asn_id TEXT NOT NULL,
+	as_a INTEGER NOT NULL,
+	as_b INTEGER NOT NULL,
 	first_seen DATETIME NOT NULL,
 	last_seen DATETIME NOT NULL,
-	FOREIGN KEY (from_asn_id) REFERENCES asns(id),
-	FOREIGN KEY (to_asn_id) REFERENCES asns(id),
-	UNIQUE(from_asn_id, to_asn_id)
+	UNIQUE(as_a, as_b)
 );
 
 -- BGP peers that send us messages
@@ -55,9 +53,9 @@ CREATE INDEX IF NOT EXISTS idx_prefixes_version_prefix ON prefixes(ip_version, p
 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_asn_peerings_from_asn ON asn_peerings(from_asn_id);
-CREATE INDEX IF NOT EXISTS idx_asn_peerings_to_asn ON asn_peerings(to_asn_id);
-CREATE INDEX IF NOT EXISTS idx_asn_peerings_lookup ON asn_peerings(from_asn_id, to_asn_id);
+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);
 
 -- Additional indexes for prefixes table
 CREATE INDEX IF NOT EXISTS idx_prefixes_prefix ON prefixes(prefix);