Ecommerce data migration: why reconciliation beats “we copied the database”

“We migrated the database” is not a completion criteria. In ecommerce, data is behavior: how customers are segmented, how orders round tax at the line level, how gift cards and store credit reconcile, how bundles explode into components for fulfillment. Copying rows without validating behavior is how teams learn about edge cases from angry finance and support tickets. At Irish Titan, the engineers and leads signing off on those mappings are direct employees from our headquarters—Titans only, not outsourced data shops.

Catalog data is never “just products”

Options, modifiers, kits, assemblies, digital goods, and market-specific attributes all encode years of compromises. Before you map fields, inventory how merchandising uses them today. The new platform may model bundles, subscriptions, or B2B price lists differently—translation beats one-to-one field matching.

Run incremental sample migrations early so merchants can click real SKUs in UAT. Surprises in week one are cheap; surprises on cutover night are not.

Customers, addresses, and compliance

Customer identity touches marketing consent, password hashes, legacy guest checkouts, and regional privacy rules. Decide what moves as-is, what gets normalized, and what must be left behind with a defensible policy. Address books often contain duplicates and one-off ship-tos—cleansing rules should be explicit, not improvised at the eleventh hour.

Orders and money do not forgive rounding errors

Historical orders power returns, warranties, tax audits, and loyalty balances. Align on what history is required for operations versus what can be archived read-only. For open pipelines, reconcile counts and financial totals between systems; a few cents of drift multiplied by thousands of lines becomes a month of forensic work.

Reconciliation beats hope

Build a reconciliation rhythm: row counts, financial totals, representative SKUs, edge-case SKUs, and a handful of “weird but important” customer accounts. Automate what repeats; log exceptions with owners. The goal is not a single green dashboard—it is trust that the new system will behave when the CEO places a test order five minutes after DNS flips.

SEO and URLs are part of the data story

URL changes are data migrations too. Redirect plans should reflect traffic and revenue, not vanity completeness. Coordinate with marketing on sitemaps, canonicals, and what gets sunset. Technical SEO is a launch requirement, not a post-mortem slide.

Data migration is where programs earn credibility. Irish Titan engineers treat it as a governed pipeline—dry runs, validation gates, and explicit cutover windows—so your team is not guessing when the warehouse asks why a bundle shipped as three lines instead of one. If that is the standard you need, tell us what you are moving between and we will be direct about risk.