feat: Implement MARS-1409 post-hook for backfilling A_WORKFLOW_HISTORY_KEY

- Added .gitignore to exclude temporary folders.
- Created SQL script to update existing A_WORKFLOW_HISTORY_KEY in A_SOURCE_FILE_RECEIVED.
- Implemented rollback script to clear backfilled A_WORKFLOW_HISTORY_KEY values.
- Added README.md for installation and usage instructions.
- Developed master installation and rollback scripts for MARS-1409 post-hook.
- Verified installation and rollback processes with detailed checks.
- Updated trigger logic to manage workflow history updates.
- Ensured proper version tracking and verification for related packages.

MARS_Packages/REL02_POST/MARS-1409-POSTHOOK/rollback_mars1409_posthook.sql

@@ -0,0 +1,76 @@
+-- ============================================================================
+-- MARS-1409-POSTHOOK Master Rollback Script
+-- ============================================================================
+-- Purpose: Rollback MARS-1409-POSTHOOK - Clear backfilled A_WORKFLOW_HISTORY_KEY
+--          values from A_SOURCE_FILE_RECEIVED.
+-- Author: Grzegorz Michalski
+-- Date: 2026-03-13
+-- Note: This clears ALL non-NULL A_WORKFLOW_HISTORY_KEY values. The trigger
+--       installed by MARS-1409 will repopulate them on next file processing.
+-- ============================================================================
+
+SET SERVEROUTPUT ON SIZE UNLIMITED
+SET VERIFY OFF
+SET FEEDBACK ON
+SET ECHO OFF
+
+-- Create log directory if it doesn't exist
+host mkdir log 2>nul
+
+-- Generate dynamic SPOOL filename with timestamp
+var filename VARCHAR2(100)
+BEGIN
+    :filename := 'log/ROLLBACK_MARS_1409_POSTHOOK_' || SYS_CONTEXT('USERENV', 'CON_NAME') || '_' || TO_CHAR(SYSDATE,'YYYYMMDD_HH24MISS') || '.log';
+END;
+/
+column filename new_value _filename
+select :filename filename from dual;
+spool &_filename
+
+PROMPT
+PROMPT ============================================================================
+PROMPT MARS-1409-POSTHOOK Rollback Starting
+PROMPT ============================================================================
+PROMPT This will reverse all changes from MARS-1409-POSTHOOK installation.
+PROMPT
+PROMPT Rollback steps:
+PROMPT 1. Clear A_WORKFLOW_HISTORY_KEY values from A_SOURCE_FILE_RECEIVED
+PROMPT 2. Verify package versions
+PROMPT ============================================================================
+
+-- Confirm rollback with user
+ACCEPT continue CHAR PROMPT 'Type YES to continue with rollback, or Ctrl+C to abort: '
+WHENEVER SQLERROR EXIT SQL.SQLCODE
+BEGIN
+    IF '&continue' IS NULL OR TRIM('&continue') IS NULL OR UPPER(TRIM('&continue')) != 'YES' THEN
+        RAISE_APPLICATION_ERROR(-20000, 'Rollback aborted by user');
+    END IF;
+END;
+/
+WHENEVER SQLERROR CONTINUE
+
+PROMPT
+PROMPT ============================================================================
+PROMPT STEP 1: Clear backfilled A_WORKFLOW_HISTORY_KEY values
+PROMPT ============================================================================
+@@91_MARS_1409_POSTHOOK_rollback_workflow_keys.sql
+
+PROMPT
+PROMPT ============================================================================
+PROMPT STEP 2: Verify Package Versions
+PROMPT ============================================================================
+@@verify_packages_version.sql
+
+PROMPT
+PROMPT ============================================================================
+PROMPT MARS-1409-POSTHOOK Rollback Complete
+PROMPT ============================================================================
+PROMPT Final Status:
+SELECT TO_CHAR(SYSDATE, 'YYYY-MM-DD HH24:MI:SS') AS rollback_end FROM DUAL;
+PROMPT
+PROMPT Review the log file for detailed results: &_filename
+PROMPT ============================================================================
+
+spool off
+
+quit;