diff --git a/CHANGELOG.md b/CHANGELOG.md
index 30619dc..72c4f5b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+
+## [1.9.0]
+
+### Added 
+
+- Relational database model (DB.hs) version 0.1 
+
 ## [1.8.1]
 
 ### Changed
diff --git a/src/DB.hs b/src/DB.hs
index b6c1098..16b4c51 100644
--- a/src/DB.hs
+++ b/src/DB.hs
@@ -52,43 +52,61 @@ derivePersistField "HexStringDB"
 share
   [mkPersist sqlSettings, mkMigrate "migrateAll"]
   [persistLowerCase|
+  -- |
+  -- | Block table (ref. #49)
+  -- | 
   ZgoBlock json 
     confs Int  default=0 
     network String default=""
     height Int default=0
     time Int default=0
     deriving Show Eq 
+  -- | Block transactions table (child table)
   ZgoBlockTx 
-    blocktx_block_id Int
-    blocktx_id Int
-    blocktx_txid String
+    blockId ZgoBlockId
+    txid String
     deriving Show Eq 
+  -- |
+  -- | Coutry codes table (ref. 0.50)
+  -- |
   ZgoCountry json
     code T.Text
     name T.Text
     UniqueCountryCode code
     deriving Show Eq  
+  -- |
+  -- | Coutry Items table )ref. #51)
+  -- } (Owner's Child table) 
+  -- |
   ZgoItem json
-    owner_id Int
+    owner ZgoOwnerId
     name T.Text
     description T.Text default=""
     cost Double default=0.0
     deriving Show Eq  
+  -- |
+  -- | Langauages table (ref #52)
+  -- |  
   ZgoLanguages 
     encode_id T.Text
     name T.Text  default-""
     element T.Text default=""
     element_text T.Text default=""
     deriving Show Eq  
+  -- |
+  -- | Orders table (ref #53)
+  -- | (Owner child table)
+  -- |  
   ZgoOrder json
     owner ZgoOwnerId
+    zaddress T.Text
     session ZgoUserId
     timestamp Int
     closed Word8
     currency T.Text
     price Double
     total Double
-    totalzec Double
+    totalZec Double
     paid Bool
     token T.Text default=""
     externalInvoice T.Text default=""
@@ -97,12 +115,19 @@ share
     tipamount Double
     vatamount Double
     deriving Show Eq  
+  -- |
+  -- | Order Lines table 
+  -- | (Order child table)
+  -- |
   ZgoOrderLines
     orderId ZgoOrderId
     qty Int default=0
     name T.Text default=""
     cost Double default=0.0
     deriving Show Eq  
+  -- |
+  -- | Owner table (ref. #54)
+  -- |
   ZgoOwner
     co_name T.Text
     firstname T.Text
@@ -116,7 +141,7 @@ share
     country T.Text
     website T.Text
     currency T.Text
-    zcaddress T.Text
+    zaddress T.Text
     usezats Bool
     crmtoken T.Text
     usetax Bool
@@ -130,6 +155,9 @@ share
     paid Bool
     expiration UTCTime
     deriving Show Eq
+  -- |
+  -- | Payment Table (ref. #55) 
+  -- |  
   ZgoPayment
     delta Int
     done  Bool
@@ -140,26 +168,37 @@ share
     txid HexStringDB
     memo T.Text
     deriving Show Eq
+  -- |
+  -- | Price Table (ref. #56)
+  -- |
   ZgoPrice 
-    price_delta Int default=0
-    price_done Bool default=0
-    price_zaddress T.Text default=""
-    price_session String default=""
-    price_blocktime Int default=0
-    price_amount Double default=0.0
-    price_txid String default=""
-    price_memo T.Text default=""
+    currency T.Text
+    price Double default=0.0
+    timestamp UTCTime
     deriving Show Eq 
-  ZgoProsession
+  -- |
+  -- | ProSesion Table (ref. #57) 
+  -- |
+  ZgoProSesion
     zaddress T.Text default=""
     expiration UTCTime
     closed Bool
     deriving Show Eq 
+  -- |
+  -- | Transaction table (ref. # 58) 
+  -- |
   ZgoTransaction
-    zaddress T.Text default=""
-    expiration Int default=0
-    closed Word8 default=0
+    zaddress T.Text 
+    session T.Text
+    confirmations Int default=0
+    blocktime Int default=0
+    amount Double default=0.00
+    txid T.Text 
+    memo T.Text
     deriving Show Eq 
+  -- | 
+  -- | User table (ref. 59)
+  -- |
   ZgoUser json
     owner ZgoOwnerId
     session UuidDB
@@ -167,17 +206,31 @@ share
     pin T.Text
     validated Bool
     deriving Show Eq 
+  -- | 
+  -- | User table (ref. 60)
+  -- |
+  ZgoWooToken 
+    owner ZgoOwnerId
+    token T.Text
+    url T.Text
+    deriving Show Eq
+  -- | 
+  -- | User table (ref. 61)
+  -- |
   ZgoXero 
     client_id T.Text default=""
     client_secret T.Text default=""
     deriving Show Eq 
-  ZgoXeroToken 
+  -- | 
+  -- | User table (ref. 62)
+  -- |
+ ZgoXeroToken 
     zaddress T.Text
     access_token  T.Text
-    expires Int
+    expires UTCTime
     refreshtoken T.Text
     accexpires Int
     accCode T.Text
-    refexpires Int
+    refexpires UTCTime
     deriving Show Eq 
   |]