Increase sales tax precision from 2 to 3 decimal places (#1525)

* Allow for tax rates with 3 decimal places

* Update input validation

* Increase precision of create procedure

src/Admin/Views/Tools/TaxRateAddEdit.cshtml

@@ -344,7 +344,7 @@
             <div class="form-group">
                 <label asp-for="Rate">Tax Rate</label>
                 <div class="input-group">
-                    <input type="text" class="form-control" asp-for="Rate" pattern="^\d{0,3}.\d{0,2}$" required>
+                    <input type="text" class="form-control" asp-for="Rate" pattern="^\d{0,3}.\d{0,3}$" required>
                     <div class="input-group-append">
                         <span class="input-group-text">%</span>
                     </div>

src/Sql/dbo/Stored Procedures/TaxRate_Create.sql

@@ -3,7 +3,7 @@ CREATE PROCEDURE [dbo].[TaxRate_Create]
     @Country VARCHAR(50),
     @State VARCHAR(2),
     @PostalCode VARCHAR(10),
-    @Rate DECIMAL(5,2),
+    @Rate DECIMAL(6,3),
     @Active BIT
 AS
 BEGIN

src/Sql/dbo/Tables/TaxRate.sql

@@ -3,7 +3,7 @@ CREATE TABLE [dbo].[TaxRate] (
     [Country]           VARCHAR(50)         NOT NULL,
     [State]             VARCHAR(2)          NULL,
     [PostalCode]        VARCHAR(10)         NOT NULL,
-    [Rate]              DECIMAL(5,2)        NOT NULL,
+    [Rate]              DECIMAL(6,3)        NOT NULL,
     [Active]            BIT                 NOT NULL,
     CONSTRAINT [PK_TaxRate] PRIMARY KEY CLUSTERED ([Id] ASC)
 );

util/Migrator/DbScripts/2021-08-19_00_FixTaxRate.sql

@@ -0,0 +1,44 @@
+IF OBJECT_ID('[dbo].[TaxRate]') IS NOT NULL
+BEGIN
+    ALTER TABLE 
+        [dbo].[TaxRate]
+    ALTER COLUMN 
+        [Rate] DECIMAL(6,3) NOT NULL;
+END
+
+IF OBJECT_ID('[dbo].[TaxRate_Create]') IS NOT NULL
+BEGIN
+    DROP PROCEDURE [dbo].[TaxRate_Create]
+END
+GO
+
+CREATE PROCEDURE [dbo].[TaxRate_Create]
+    @Id VARCHAR(40) OUTPUT,
+    @Country VARCHAR(50),
+    @State VARCHAR(2),
+    @PostalCode VARCHAR(10),
+    @Rate DECIMAL(6,3),
+    @Active BIT
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    INSERT INTO [dbo].[TaxRate]
+    (
+        [Id],
+        [Country],
+        [State],
+        [PostalCode],
+        [Rate],
+        [Active]
+    )
+    VALUES
+    (
+        @Id,
+        @Country,
+        @State,
+        @PostalCode,
+        @Rate,
+        1
+    )
+END