diff --git a/deploy/setup.sql b/deploy/setup.sql
index d0ad89c..87e86da 100644
--- a/deploy/setup.sql
+++ b/deploy/setup.sql
@@ -51,7 +51,8 @@ CREATE TABLE tps.map_rm (
     srce text NOT NULL,
     target text NOT NULL,
     regex jsonb,
-    seq integer NOT NULL
+    seq integer NOT NULL,
+    hist jsonb
 );
 COMMENT ON TABLE tps.map_rm IS 'regex map instructions';
 
diff --git a/interface/map_def/srce_map_def_set.sql b/interface/map_def/srce_map_def_set.sql
index 257fe5e..5127912 100644
--- a/interface/map_def/srce_map_def_set.sql
+++ b/interface/map_def/srce_map_def_set.sql
@@ -15,15 +15,36 @@ BEGIN
         INSERT INTO
             tps.map_rm
         SELECT
+            --data source
             _defn->>'srce'
+            --map name
             ,_defn->>'name'
+            --map definition
             ,_defn
+            --map aggregation sequence
             ,_defn->>'sequence'
+            --history definition
+            ,jsonb_build_object(
+                'hist_defn',_defn
+                ,'effective',jsonb_build_array(CURRENT_TIMESTAMP,null::timestamptz)
+            ) || '[]'::jsonb
         ON CONFLICT ON CONSTRAINT map_rm_pk DO UPDATE SET
             srce = _defn->>'srce'
             ,target = _defn->>'name'
             ,regex = _defn
-            ,seq = _defn->>'sequence';
+            ,seq = _defn->>'sequence'
+            ,hist = 
+                    --the new definition going to position -0-
+                    jsonb_build_object(
+                        'hist_defn',_defn
+                        ,'effective',jsonb_build_array(CURRENT_TIMESTAMP,null::timestamptz)
+                    ) 
+                    --the previous definition, set upper bound of effective range which was previously null
+                    || jsonb_set(
+                        map_rm.hist
+                        ,'{0,effective,1}'::text[]
+                        ,to_jsonb(CURRENT_TIMESTAMP)
+                    );
 
     EXCEPTION WHEN OTHERS THEN