Show more internal information about pq error

cmd/hubserver/storage/postgres.go

@@ -4,7 +4,8 @@ import (
 	"database/sql"
 	"fmt"
 
-	_ "github.com/lib/pq"
+	"github.com/davecgh/go-spew/spew"
+	"github.com/lib/pq"
 )
 
 type postgres struct {
@@ -31,6 +32,9 @@ func (s *postgres) Subscribe(topic string, sub Subscriber) error {
 		sub.LeaseSeconds,
 		sub.Secret,
 	)
+	if e, ok := err.(pq.Error); ok {
+		spew.Dump(e)
+	}
 	return err
 }