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/models.go

@@ -8,8 +8,7 @@ import (
 
 // ASN represents an Autonomous System Number
 type ASN struct {
-	ID          uuid.UUID `json:"id"`
-	Number      int       `json:"number"`
+	ASN         int       `json:"asn"`
 	Handle      string    `json:"handle"`
 	Description string    `json:"description"`
 	FirstSeen   time.Time `json:"first_seen"`
@@ -29,8 +28,8 @@ type Prefix struct {
 type Announcement struct {
 	ID           uuid.UUID `json:"id"`
 	PrefixID     uuid.UUID `json:"prefix_id"`
-	ASNID        uuid.UUID `json:"asn_id"`
-	OriginASNID  uuid.UUID `json:"origin_asn_id"`
+	PeerASN      int       `json:"peer_asn"`
+	OriginASN    int       `json:"origin_asn"`
 	Path         string    `json:"path"` // JSON-encoded AS path
 	NextHop      string    `json:"next_hop"`
 	Timestamp    time.Time `json:"timestamp"`
@@ -40,8 +39,8 @@ type Announcement struct {
 // ASNPeering represents a peering relationship between two ASNs
 type ASNPeering struct {
 	ID        uuid.UUID `json:"id"`
-	FromASNID uuid.UUID `json:"from_asn_id"`
-	ToASNID   uuid.UUID `json:"to_asn_id"`
+	ASA       int       `json:"as_a"`
+	ASB       int       `json:"as_b"`
 	FirstSeen time.Time `json:"first_seen"`
 	LastSeen  time.Time `json:"last_seen"`
 }