add rollforward test file

roll_forward.sql

@@ -0,0 +1,59 @@
+WITH
+list AS (
+    SELECT 
+        acct
+        ,min(lower(dur)) minp
+        ,max(lower(dur)) maxp
+    FROM
+        evt.bal b
+        INNER JOIN evt.fspr f ON
+            f.id = b.fspr
+    GROUP BY
+        acct
+)
+,seq AS (
+    WITH RECURSIVE rf (acct, minp, maxp, id, dur, obal, debits, credits, cbal) AS
+    (
+        SELECT
+            list.acct
+            ,list.minp
+            ,list.maxp
+            ,f.id
+            ,f.dur
+            ,b.obal::numeric(12,2)
+            ,b.debits::numeric(12,2)
+            ,b.credits::numeric(12,2)
+            ,b.cbal::numeric(12,2)
+        FROM
+            list
+            INNER JOIN evt.fspr f ON
+                lower(f.dur) = list.minp
+            LEFT OUTER JOIN evt.bal b ON
+                b.acct = list.acct
+                AND b.fspr = f.id
+        
+        UNION ALL
+
+        SELECT
+            rf.acct
+            ,rf.minp
+            ,rf.maxp
+            ,f.id
+            ,f.dur
+            ,COALESCE(rf.cbal,0)::numeric(12,2)
+            ,COALESCE(b.debits,0)::numeric(12,2)
+            ,COALESCE(b.credits,0)::numeric(12,2)
+            ,(COALESCE(rf.cbal,0) + COALESCE(b.debits,0) + COALESCE(b.credits,0))::numeric(12,2)
+        FROM
+            rf
+            INNER JOIN evt.fspr f ON
+                lower(f.dur) = upper(rf.dur)
+            LEFT OUTER JOIN evt.bal b ON
+                b.acct = rf.acct
+                AND b.fspr = f.id
+        WHERE
+            lower(f.dur) <= rf.maxp
+    )
+    select * from rf
+)
+SELECT * FROM seq ORDER BY acct, dur