diff --git a/IV/tests.sql b/IV/tests.sql
index b02c8ab..5fa273a 100644
--- a/IV/tests.sql
+++ b/IV/tests.sql
@@ -11,9 +11,9 @@ begin
 end $$ LANGUAGE plpgsql;
 
 -- to preview this somewhat conveniently in QGIS:
--- stage || '_' || dbgname || ' i:' || coalesce(i,'<nil>') || ' j:'|| coalesce(j,'<nil>')
+-- stage || '_' || dbgname || ' iter:' || iter || ' nbend:'|| nbend
 drop table if exists debug_wm;
-create table debug_wm(stage text, dbgname text, i bigint, j bigint, way geometry, props json);
+create table debug_wm(stage text, dbgname text, iter bigint, nbend bigint, way geometry, props json);
 
 drop table if exists figures;
 create table figures (name text, way geometry);
diff --git a/IV/wm.sql b/IV/wm.sql
index 9a2fb56..5d547b6 100644
--- a/IV/wm.sql
+++ b/IV/wm.sql
@@ -299,9 +299,10 @@ begin
       select (res.area*(0.75/res.cmp)) into res.adjsize;
     end if;
     if dbgname is not null then
-      insert into debug_wm (stage, dbgname, i, way, props) values(
+      insert into debug_wm (stage, dbgname, iter, nbend, way, props) values(
         'ebendattrs',
         dbgname,
+        1,
         i,
         bend,
         json_build_object(
@@ -345,9 +346,10 @@ begin
     dbg_stage = 1;
     while mutated loop
       if dbgname is not null then
-        insert into debug_wm (stage, dbgname, i, way) values(
+        insert into debug_wm (stage, dbgname, iter, nbend, way) values(
           'afigures',
           dbgname,
+          1,
           i,
           lines[i]
         );
@@ -356,7 +358,7 @@ begin
       bends = detect_bends(lines[i]);
 
       if dbgname is not null then
-        insert into debug_wm(stage, dbgname, i, j, way) values(
+        insert into debug_wm(stage, dbgname, iter, nbend, way) values(
           'bbends',
           dbgname,
           i,
@@ -368,7 +370,7 @@ begin
       bends = fix_gentle_inflections(bends);
 
       if dbgname is not null then
-        insert into debug_wm(stage, dbgname, i, j, way) values(
+        insert into debug_wm(stage, dbgname, iter, nbend, way) values(
           'cinflections',
           dbgname,
           i,
@@ -380,7 +382,7 @@ begin
       select * from self_crossing(bends) into bends, mutated;
 
       if dbgname is not null then
-        insert into debug_wm(stage, dbgname, i, j, way) values(
+        insert into debug_wm(stage, dbgname, iter, nbend, way) values(
           'dcrossings',
           dbgname,
           i,