A customer-record exercise in November 2025 evaluated 120,000 candidate links across store and direct online records. Under the agreed matching rules, 108,000 had sufficient consistent evidence for linkage. Twelve thousand remained ambiguous. Similar contact details could arise in different circumstances, and the programme could not resolve identity merely by preferring a high merge rate. We needed a record of why a link was accepted, as well as a way to preserve uncertainty where the evidence was insufficient.
I recommended a bounded review programme costing ₹95 lakh. The customer-marketing sponsor preferred a wider combined view for service planning. The alternative was to lower the matching requirement and let service teams correct mistaken combinations later. That would have made a more complete-looking customer view at the expense of confidence in what it represented. Relevant business owners and the specialist team agreed the review process. The technology function implemented it and retained the basis for each decision; we did not invent customer details to close the unresolved group.
Further examination confirmed 4,000 of the 12,000 ambiguous links. The remaining 8,000 stayed separate. That left 112,000 linked candidates and 8,000 unresolved candidates within the examined set. Those counts did not necessarily equal unique people, and I did not present them as a customer population or a marketing audience. The programme also distinguished identity linkage from permission to use the details for a particular purpose. A better match did not supply a new authority that had never been established through the company's process.
We completed the exercise with the unresolved group visible and a continuing owner for later evidence. I reported the cost and the limitations beside the increased linkage count. The result was a more explainable record, not a legal-compliance certification or a claim that every related entry had been identified. For me, the decision demonstrated a useful restraint: a common view becomes more credible when it shows where the enterprise does not yet know enough, rather than making every gap disappear through a convenient technical rule.
I would include ambiguous customer relationships in the initial linking exercise, rather than begin with straightforward matches that make the eventual exception population look peripheral.