diff --git a/db_deploy.sql b/db_deploy.sql
index 2a87b5b..0e66409 100644
--- a/db_deploy.sql
+++ b/db_deploy.sql
@@ -1,10 +1,10 @@
 BEGIN TRANSACTION;
 --\conninfo
-DROP SCHEMA IF EXISTS evt cascade;
-DROP EXTENSION IF EXISTS ltree;
-CREATE EXTENSION ltree;
 --------------------------build schema----------------------------------------------
 
+DROP EXTENSTION IF EXISTS ltree;
+CREATE EXTENSTION ltree;
+DROP SCHEMA IF EXISTS evt cascade;
 CREATE SCHEMA evt;
 COMMENT ON SCHEMA evt IS 'event log';
 
diff --git a/schema/suggested_data/periods.sql b/schema/suggested_data/periods.sql
new file mode 100644
index 0000000..b437ecd
--- /dev/null
+++ b/schema/suggested_data/periods.sql
@@ -0,0 +1,32 @@
+WITH
+--startign month
+startm AS (
+    SELECT 1 as m
+)
+,m AS (
+    SELECT
+        g.s calendar_month
+        ,startm.m starting_month
+        ,g.s + CASE WHEN g.s < startm.m THEN startm.m +1 ELSE -startm.m +1 END fisc_month
+    FROM
+        generate_series(1,12,1) g(s)
+        CROSS JOIN startm
+)
+--select * from m
+INSERT INTO
+    evt.fspr
+SELECT 
+    --TO_CHAR(gs.d,'YYYY.MM.DD')::ltree t1
+    (
+        --year
+        to_char(extract(year from gs.d),'FM0000')
+        --month
+        ||'.'||to_char(m.fisc_month,'FM00')
+    )::ltree t2
+    ,tstzrange(gs.d,gs.d + '1 month'::interval) r
+FROM 
+    generate_series('2018-01-01 00:00'::timestamptz,'2099-12-01 00:00'::timestamptz,'1 month') gs(d)
+    INNER JOIN m ON
+        m.calendar_month = extract(month from gs.d)
+ORDER BY 
+    gs.d ASC
diff --git a/schema/tables/fspr.sql b/schema/tables/fspr.sql
index 17b7a19..967fafe 100644
--- a/schema/tables/fspr.sql
+++ b/schema/tables/fspr.sql
@@ -7,4 +7,4 @@ CREATE TABLE evt.fspr (
 COMMENT ON COLUMN evt.fspr.id IS 'fiscal period';
 COMMENT ON COLUMN evt.fspr.dur IS 'duration of period as timestamp range';
 
-CREATE INDEX id_gist ON evt.fspr USING GIST (id);
\ No newline at end of file
+CREATE INDEX id_gist ON evt.fspr USING GIST (id);