Point search pipeline at Search2 table and *2 procs for v5 POC

Re-target all search reads, writes, and stored proc calls to dbo.Search2 /
SubmitSearch2 / StartSearch2 / CompleteSearch2 / ResetPartialSearches2 so
the POC can run side-by-side with prod against the same QA database
without contending on the Search table or its procs. Standalone deployment
SQL for the new table and procs lives in OLD/sql/ and must be run against
the target DB before the POC apps are started.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

OLD/sql/Search2.sql

@@ -0,0 +1,17 @@
+CREATE TABLE [dbo].[Search2]
+(
+	[ID] INT IDENTITY(1,1) NOT NULL,
+    [UserName] VARCHAR(128) NOT NULL,
+    [Name] VARCHAR(128) NULL,
+    [Status] SMALLINT NOT NULL,
+    [SubmitDT] DATETIME NULL,
+    [StartDT] DATETIME NULL,
+	[EndDT] DATETIME NULL,
+    [Criteria] VARCHAR(MAX) NULL,
+    [Results] VARBINARY(MAX) NULL,
+	CONSTRAINT [PK_Search2] PRIMARY KEY CLUSTERED([ID])
+)
+
+GO
+
+CREATE INDEX [IX_Search2_UserName] ON [dbo].[Search2] ([UserName])