Remove the per-peer route tables (closes #122)

The routing table in memory now holds every route, so the two per-peer route
tables go, with every write, delete, count and read that served them. The
prefix handler applies each update to the table, writes the table's changes
every second, and stores each new prefix with its first-seen time. The peer
delete, its retry on the next flush and the updates held for it go too.

The image's memory settings fit a full table of about 1 GB: GOMEMLIMIT of
2.5 GiB, a 512 MiB page cache for the writing connection, and SQLite heap
limits of 768 MiB and 1 GiB. The README describes the new table, its
database copy and the memory budget.

Model: opus-5-5

internal/database/interface.go

@@ -1,7 +1,6 @@
-// Package database provides SQLite storage for BGP routing data including ASNs,
-// prefixes, announcements, peerings, and live route tables. Its routes table
-// holds a copy of the whole routing table that internal/routetable keeps in
-// memory.
+// Package database provides SQLite storage for BGP routing data: ASNs,
+// prefixes, announcements, peerings and BGP peers. Its routes table holds a
+// copy of the whole routing table that internal/routetable keeps in memory.
 package database
 
 import (
@@ -12,26 +11,21 @@ import (
 	"git.eeqj.de/sneak/routewatch/internal/routetable"
 )
 
-// Stats contains database statistics including counts for ASNs, prefixes,
-// peerings, peers, and live routes, as well as file size and prefix distribution data.
+// Stats contains database statistics: counts of ASNs, prefixes, peerings and
+// peers, and the file size.
 type Stats struct {
-	ASNs                   int
-	Prefixes               int
-	IPv4Prefixes           int
-	IPv6Prefixes           int
-	Peerings               int
-	Peers                  int
-	FileSizeBytes          int64
-	LiveRoutes             int
-	IPv4Routes             int
-	IPv6Routes             int
-	IPv4PrefixDistribution []PrefixDistribution
-	IPv6PrefixDistribution []PrefixDistribution
+	ASNs          int
+	Prefixes      int
+	IPv4Prefixes  int
+	IPv6Prefixes  int
+	Peerings      int
+	Peers         int
+	FileSizeBytes int64
 }
 
 // Store defines the interface for database operations. It provides methods for
-// managing ASNs, prefixes, announcements, peerings, BGP peers, and live routes.
-// Implementations must be safe for concurrent use.
+// managing ASNs, prefixes, announcements, peerings, BGP peers, and the copy of
+// the routing table. Implementations must be safe for concurrent use.
 //
 //nolint:interfacebloat // the one seam handlers and tests depend on
 type Store interface {
@@ -57,27 +51,10 @@ type Store interface {
 	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, peerIP string) error
-	DeleteLiveRouteBatch(deletions []LiveRouteDeletion) error
-	DeleteLiveRoutesOfPeer(peerIP string) (deleted int, err error)
-	GetPrefixDistribution() (
-		ipv4 []PrefixDistribution, ipv6 []PrefixDistribution, err error)
-	GetPrefixDistributionContext(ctx context.Context) (
-		ipv4 []PrefixDistribution, ipv6 []PrefixDistribution, err error)
-	GetLiveRouteCounts() (ipv4Count, ipv6Count int, err error)
-	GetLiveRouteCountsContext(ctx context.Context) (ipv4Count, ipv6Count int, err error)
-
 	// Routing table operations: the database's copy of the table in memory
 	WriteRouteChanges(changes []routetable.Change, newPeers map[string]uint) error
 	ReadRouteTable(ctx context.Context) (*routetable.Table, error)
 
-	// IP lookup operations
-	GetIPInfo(ip string) (*IPInfo, error)
-	GetIPInfoContext(ctx context.Context, ip string) (*IPInfo, error)
-
 	// ASN WHOIS operations
 	GetNextStaleASN(ctx context.Context, staleThreshold time.Duration) (int, error)
 	UpdateASNWHOIS(ctx context.Context, update *ASNWHOISUpdate) error
@@ -87,18 +64,8 @@ type Store interface {
 	GetAS(ctx context.Context, asn int) (*ASN, bool, error)
 	GetASWHOIS(ctx context.Context, asn int) (*ASN, error)
 	GetPrefixFirstSeen(ctx context.Context, prefix netip.Prefix) (time.Time, error)
-	GetASDetails(asn int) (*ASN, []LiveRoute, error)
-	GetASDetailsContext(ctx context.Context, asn int) (*ASN, []LiveRoute, error)
 	GetASPeers(asn int) ([]ASPeer, error)
 	GetASPeersContext(ctx context.Context, asn int) ([]ASPeer, error)
-	GetPrefixDetails(prefix string) ([]LiveRoute, map[int]ASN, error)
-	GetPrefixDetailsContext(
-		ctx context.Context, prefix string,
-	) ([]LiveRoute, map[int]ASN, error)
-	GetRandomPrefixesByLength(maskLength, ipVersion, limit int) ([]LiveRoute, error)
-	GetRandomPrefixesByLengthContext(
-		ctx context.Context, maskLength, ipVersion, limit int,
-	) ([]LiveRoute, error)
 
 	// Lifecycle
 	Close() error