diff --git a/build/build_baseline.sql b/build/build_baseline.sql
index c93c252..71a7d84 100644
--- a/build/build_baseline.sql
+++ b/build/build_baseline.sql
@@ -1,3 +1,13 @@
+/*
+baseline        - selections from actual, plan, and forecast
+incr            - increment selection from baseline
+incoming        - baseline & incr stacked
+negative        - apply negative values to existing baseline to create a diff
+diff            - stack incoming and the negative
+collapse_diff   - group the diff to create single diff rows per item
+*/
+
+
 BEGIN;
 --\timing
 --CREATE TABLE IF NOT EXISTS rlarp.osmf_stage AS (SELECT * FROM rlarp.osmf_dev) WITH no data;
@@ -17,10 +27,11 @@ CREATE TEMP TABLE tdr AS (
         -----------baseline selection for increment--------------------------
         ,DATERANGE('2021-07-08','2021-07-08','[)') selection
         -----------selection increment size----------------------------------
-        --need to specify the overlap, or derive it?
         ,'0 year'::interval AS incr
         -----------iterations to merge with----------------------------------
         ,(SELECT jsonb_agg(x.v) FROM (VALUES('copy'),('actuals'),('actuals_plug')) AS x(v)) iter
+        -----------existing baseline overlap---------------------------------
+        ,DATERANGE('2000-06-01','2021-07-08') overlap
 );
 
 --select * from tdr
@@ -641,7 +652,7 @@ SELECT
     ,rg.ssyr                                    rseas    --incremented
     ,(o.sdate + (SELECT incr FROM tdr))::date   sdate    --incremented
     ,sg.ssyr                                    sseas    --incremented
-    ,'b22' "version"
+    ,'1+11' "version"
     ,'copy' iter
 FROM 
     baseline o
@@ -658,12 +669,12 @@ WHERE
     (o.sdate + (SELECT incr FROM tdr))::date <@ (SELECT selection FROM tdr)
 )
 --SELECT count(*) FROM baseline
-,stage AS (
+,incoming AS (
 SELECT * FROM incr
 UNION ALL
 SELECT * FROM baseline
 )
-,remove AS (
+,negative AS (
     SELECT
         -----------documents-------------
         null::int "ddord#"
@@ -813,12 +824,12 @@ SELECT * FROM baseline
         ,o.version
         ,o.iter
 )
-,stack AS (
-    SELECT * FROM stage
+,diff AS (
+    SELECT * FROM incoming
     UNION ALL 
-    SELECT * FROM remove
+    SELECT * FROM negative
 )
-,merge_diff AS (
+,collapse_diff AS (
     SELECT
         -----------documents-------------
         null::int "ddord#"
@@ -929,7 +940,7 @@ SELECT * FROM baseline
         ,'actuals' AS version
         ,'copy' iter
     FROM
-        stack o
+        diff o
     WHERE
         true
         --collect all the rows in the base period and
@@ -969,7 +980,7 @@ SELECT * FROM baseline
     --    OR round(sum(o.fb_val_loc),2) <> 0
         --OR round(sum(o.fb_cst_loc),2) <> 0
 )
-INSERT INTO rlarp.osmf_dev SELECT * FROM merge_diff;
+INSERT INTO rlarp.osmf_dev SELECT * FROM collapse_diff;
 
 
 UPDATE
diff --git a/build/rebuild_forecast.sh b/build/rebuild_forecast.sh
index 1164536..db73cb4 100644
--- a/build/rebuild_forecast.sh
+++ b/build/rebuild_forecast.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
-$PG -f ./build_stage.sql;
+#$PG -f ./build_stage.sql;
+$PG -f ./build_baseline.sql;
 $PG -f ./snap_itemm.sql;
 $PG -f ./snap_cost_current.sql;
 $PG -f ./snap_customer.sql;