Initial Commit of the PDM project (ready for DWS migration)

.gitignore

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+# Secrets
+config.json
+
+# Python bytecode
+__pycache__/
+*.pyc
+*.pyo
+
+# Logs (anywhere in the tree)
+logs/
+*.log
+
+# Generated migration outputs (timestamped)
+mapping_documents_filedata_*.csv
+mapping_variables_filedata_*.csv
+filedata_migration_*.log
+
+# Generated helper outputs (timestamped)
+helpers/failed_transitions_*.txt
+helpers/not_available_*.txt
+helpers/not_found_*.txt
+helpers/has_vv50_*.txt
+helpers/failed_copies_*.txt
+
+# Environment-specific input data (kept locally, not committed)
+helpers/*.csv
+helpers/*.xlsx
+# ...but keep the reference/sample files
+!helpers/samples/
+!helpers/samples/*.csv
+
+# IDE / OS
+.vscode/
+.idea/
+.DS_Store
+Thumbs.db