Optimize database batch operations with prepared statements

- Add prepared statements to all batch operations for better performance
- Fix database lock contention by properly batching operations
- Update SQLite settings for extreme performance (8GB cache, sync OFF)
- Add proper error handling for statement closing
- Update tests to properly track batch operations

internal/database/interface.go

@@ -22,6 +22,7 @@ type Stats struct {
 type Store interface {
 	// ASN operations
 	GetOrCreateASN(number int, timestamp time.Time) (*ASN, error)
+	GetOrCreateASNBatch(asns map[int]time.Time) error
 
 	// Prefix operations
 	GetOrCreatePrefix(prefix string, timestamp time.Time) (*Prefix, error)
@@ -37,10 +38,13 @@ type Store interface {
 
 	// Peer operations
 	UpdatePeer(peerIP string, peerASN int, messageType string, timestamp time.Time) error
+	UpdatePeerBatch(peers map[string]PeerUpdate) error
 
 	// Live route operations
 	UpsertLiveRoute(route *LiveRoute) error
+	UpsertLiveRouteBatch(routes []*LiveRoute) error
 	DeleteLiveRoute(prefix string, originASN int, peerIP string) error
+	DeleteLiveRouteBatch(deletions []LiveRouteDeletion) error
 	GetPrefixDistribution() (ipv4 []PrefixDistribution, ipv6 []PrefixDistribution, err error)
 	GetLiveRouteCounts() (ipv4Count, ipv6Count int, err error)