https://www.lakshyapratap.com/blog Production notes on ledgers, reconciliation, payment rails, migrations and the systems that move money — plus the engagements they came from. en-in Fri, 28 Aug 2026 00:00:00 GMT https://www.lakshyapratap.com/blog/upi-reconciliation https://www.lakshyapratap.com/blog/upi-reconciliation Fri, 28 Aug 2026 00:00:00 GMT Writing Why UPI settles in seconds but reconciles on another clock: which reference to key on, the state nobody models, and the three-way match that works. https://www.lakshyapratap.com/blog/india-payment-rails https://www.lakshyapratap.com/blog/india-payment-rails Fri, 28 Aug 2026 00:00:00 GMT Writing UPI, IMPS, NEFT and RTGS differ in timing, reversal behaviour and which identifier settlement files join on. Modelling all four is an architecture job. https://www.lakshyapratap.com/blog/gateway-settlement-matching https://www.lakshyapratap.com/blog/gateway-settlement-matching Fri, 28 Aug 2026 00:00:00 GMT Writing Commission, tax, refunds from other periods, chargebacks and rolling reserve sit between gross sales and the bank credit. Each needs its own account. https://www.lakshyapratap.com/blog/double-entry https://www.lakshyapratap.com/blog/double-entry Wed, 19 Aug 2026 00:00:00 GMT Writing Double-entry explained as an invariant system rather than accounting jargon: a five-hundred-year-old consistency protocol that assumes humans make mistakes. https://www.lakshyapratap.com/work/erp-migration https://www.lakshyapratap.com/work/erp-migration Wed, 19 Aug 2026 00:00:00 GMT Case study A decade of Tally, Excel and paper registers moved onto a live ERP in stages, with parallel runs throughout, and the factory floor never stopped for a day. https://www.lakshyapratap.com/work/growth-01 https://www.lakshyapratap.com/work/growth-01 Wed, 19 Aug 2026 00:00:00 GMT Case study A services business with excellent delivery and no digital footprint, given the search and content system this practice now sells, proven on them first. https://www.lakshyapratap.com/work/portfolio-system https://www.lakshyapratap.com/work/portfolio-system Wed, 19 Aug 2026 00:00:00 GMT Case study Multi-asset positions rebuilt as transaction-true accounting with live profit and loss, streaming prices and value-at-risk, replacing quarterly archaeology. https://www.lakshyapratap.com/blog/ai-search-ranking https://www.lakshyapratap.com/blog/ai-search-ranking Wed, 19 Aug 2026 00:00:00 GMT Writing How to be cited by ChatGPT, Claude and Perplexity: the crawlability gate, answer-first passages, one consistent entity, and a panel you measure monthly. https://www.lakshyapratap.com/work/reconciliation https://www.lakshyapratap.com/work/reconciliation Wed, 19 Aug 2026 00:00:00 GMT Case study Month-end reconciliation was days of spreadsheet archaeology and quiet write-offs. Automated three-way matching cut it to a morning of reviewing exceptions. https://www.lakshyapratap.com/work/risk-modelling https://www.lakshyapratap.com/work/risk-modelling Wed, 19 Aug 2026 00:00:00 GMT Case study Monte Carlo risk at a hundred thousand paths, moved onto the GPU so value-at-risk answers arrive before a desk decision instead of overnight after one. https://www.lakshyapratap.com/work/ledger-rebuild https://www.lakshyapratap.com/work/ledger-rebuild Tue, 18 Aug 2026 00:00:00 GMT Case study How a payments business rebuilt its ledger to handle thirteen lakh a month with zero reconciliation drift, and what the migration cost in time and engineering. https://www.lakshyapratap.com/work/migration https://www.lakshyapratap.com/work/migration Tue, 18 Aug 2026 00:00:00 GMT Case study How an eighteen-month legacy migration was re-planned and delivered in five, using the strangler pattern and dual writes, with no customer-facing downtime. https://www.lakshyapratap.com/blog/conversion-optimisation https://www.lakshyapratap.com/blog/conversion-optimisation Tue, 18 Aug 2026 00:00:00 GMT Writing Testing without fooling yourself: sample sizes, stopping rules and the traps that make a losing variant look like a winner in the second week of a test. https://www.lakshyapratap.com/blog/event-driven-pitfalls https://www.lakshyapratap.com/blog/event-driven-pitfalls Tue, 18 Aug 2026 00:00:00 GMT Writing Ordering, replay and poison messages are the three failures that ruin most event-driven systems. What to design in first, and which guarantees you can skip. https://www.lakshyapratap.com/blog/generative-engine-opt https://www.lakshyapratap.com/blog/generative-engine-opt Tue, 18 Aug 2026 00:00:00 GMT Writing How AI answer engines choose what to cite, why entity clarity matters more than keyword density, and what to change on a site to be named in generated answers. https://www.lakshyapratap.com/blog/google-updates https://www.lakshyapratap.com/blog/google-updates Tue, 18 Aug 2026 00:00:00 GMT Writing What actually changed in the recent core updates, separated from the speculation, and which of those changes justify doing anything different on your own site. https://www.lakshyapratap.com/blog/idempotency-done-right https://www.lakshyapratap.com/blog/idempotency-done-right Tue, 18 Aug 2026 00:00:00 GMT Writing Keys, time windows and where to store them. How to make a payments API safely retryable without quietly double-charging a customer during a network failure. https://www.lakshyapratap.com/blog/ledger-design https://www.lakshyapratap.com/blog/ledger-design Tue, 18 Aug 2026 00:00:00 GMT Writing Why double-entry wins for any product that moves money, and what goes wrong the moment you try to store balances instead of deriving them from the entries. https://www.lakshyapratap.com/blog/postgres-in-production https://www.lakshyapratap.com/blog/postgres-in-production Tue, 18 Aug 2026 00:00:00 GMT Writing Indexes, vacuum and lock contention: the three things that decide whether Postgres stays fast at scale, and how to spot each one before it takes the site down. https://www.lakshyapratap.com/blog/reconciliation-at-scale https://www.lakshyapratap.com/blog/reconciliation-at-scale Tue, 18 Aug 2026 00:00:00 GMT Writing Matching millions of transactions nightly without a queue of unresolved breaks: how to rank exceptions by value and resolve them from a guided audit workflow. https://www.lakshyapratap.com/blog/the-t-1-problem https://www.lakshyapratap.com/blog/the-t-1-problem Tue, 18 Aug 2026 00:00:00 GMT Writing Settlement time and business reality rarely agree. How to model T+1 properly so your customer balance, your bank statement and your ledger tell one story. https://www.lakshyapratap.com/blog/technical-seo https://www.lakshyapratap.com/blog/technical-seo Tue, 18 Aug 2026 00:00:00 GMT Writing Crawl, index and Core Web Vitals explained for engineers: which platform decisions quietly cost you rankings, and how to fix them in the codebase, not a plugin. https://www.lakshyapratap.com/blog/local-seo https://www.lakshyapratap.com/blog/local-seo Tue, 18 Aug 2026 00:00:00 GMT Writing Maps, business profile and citations, in the order that actually moves the local pack. A practical sequence for practices competing inside a few kilometres. https://www.lakshyapratap.com/blog/why-your-ledger-drifts https://www.lakshyapratap.com/blog/why-your-ledger-drifts Tue, 18 Aug 2026 00:00:00 GMT Writing Ledger drift is never random. Where the difference actually comes from, how to prove it with a reconciliation query, and what to change so it cannot recur. https://www.lakshyapratap.com/blog/zero-downtime-migration https://www.lakshyapratap.com/blog/zero-downtime-migration Tue, 18 Aug 2026 00:00:00 GMT Writing Dual-write and backfill, done in the right order. A practical sequence for moving a live database without a maintenance window or a nervous rollback plan.