fix(api): SNMP/hosts — одна строка на IP (DISTINCT ON), лимиты для больших сканов

Made-with: Cursor

internal/scans/postgres_store.go

@@ -291,12 +291,17 @@ values ($1, $2, $3, $4)`
 
 func (s *PostgresStore) ListHostResults(scanID string, limit int) []HostResult {
 	if limit <= 0 {
-		limit = 500
+		limit = 200000
 	}
+	// Одна актуальная строка на IP (иначе при limit по времени часть хостов без SNMP в UI).
 	query := `
 select ip::text, is_up, checked_at
-from scan_hosts
-where scan_id = $1
+from (
+  select distinct on (ip) ip, is_up, checked_at
+  from scan_hosts
+  where scan_id = $1
+  order by ip asc, checked_at desc
+) t
 order by checked_at desc
 limit $2`
 	rows, err := s.db.QueryContext(context.Background(), query, scanID, limit)
@@ -380,13 +385,17 @@ values ($1, $2, $3, $4, $5, $6, $7, $8)`
 
 func (s *PostgresStore) ListSNMPResults(scanID string, limit int) []SNMPResult {
 	if limit <= 0 {
-		limit = 1000
+		limit = 200000
 	}
 	query := `
 select ip::text, success, coalesce(sys_name, ''), coalesce(sys_descr, ''), coalesce(sys_object_id, ''),
        coalesce(error_text, ''), checked_at
-from scan_snmp
-where scan_id = $1
+from (
+  select distinct on (ip) ip, success, sys_name, sys_descr, sys_object_id, error_text, checked_at
+  from scan_snmp
+  where scan_id = $1
+  order by ip asc, checked_at desc
+) t
 order by checked_at desc
 limit $2`
 	rows, err := s.db.QueryContext(context.Background(), query, scanID, limit)