Technical essays on healthcare software architecture, PostgreSQL multi-tenancy, ABDM integration, inventory ledgers, applied AI, and DPDP compliance by Pravesh Singh (Founder & CTO, SoftEdge Technology Solutions). https://praveshsingh.com/writing/ 2026-09-23T00:00:00Z Pravesh Singh hello@praveshsingh.com https://praveshsingh.com/ praveshsingh.com static generator https://praveshsingh.com/writing/offline-tolerant-hospital-software.html 2026-09-15T00:00:00Z 2026-09-23T00:00:00Z

Offline-tolerant hospital software treats the device's local SQLite or IndexedDB store as the primary write path, committing every clinical action in under 15 milliseconds. Conflicts resolve per domain — immutable clinical events, column-level CRDTs, double-entry inventory ledgers — while batch sync with idempotency keys absorbs reconnection floods.

https://praveshsingh.com/writing/abdm-integration-developer-guide.html 2026-08-20T00:00:00Z 2026-09-23T00:00:00Z

Wire your hospital system into India's ABDM gateway as a HIP or HIU. Every gateway call is asynchronous: HTTP 202, then a signed /v0.5/ webhook callback. Production readiness spans ABHA verification (M1), care-context linking (M2), and consent-driven FHIR R4 exchange encrypted with ECDH (M3).

https://praveshsingh.com/writing/multi-tenant-postgresql-isolation.html 2026-07-14T00:00:00Z 2026-09-23T00:00:00Z

Shared-schema Row-Level Security (RLS) scales better than schema-per-tenant for B2B SaaS: one migration, normal PgBouncer transaction pooling, per-row tenant isolation via session-scoped tenant_id policies. Schema-per-tenant suits fewer than ~100 high-compliance enterprise customers.

https://praveshsingh.com/writing/high-value-medicine-inventory-logistics.html 2026-06-18T00:00:00Z 2026-09-23T00:00:00Z

Every stock movement of Factor VIII/IX becomes a balanced debit/credit journal entry; on-hand quantity is a derived SUM, never a mutable counter. PostgreSQL FOR UPDATE SKIP LOCKED enforces FEFO allocation under concurrency, and the ledger survives regulatory audits with zero phantom stock.

https://praveshsingh.com/writing/structured-data-extraction-llm-limits.html 2026-05-12T00:00:00Z 2026-09-23T00:00:00Z

Naive prompting fails enterprise extraction on schema drift, hallucinated fields, arithmetic errors, and provenance. The production answer: schema-constrained decoding, Pydantic invariant validation, targeted delta-retry loops, and bounding-box citation anchoring — achieving >99.4% field-level precision.

https://praveshsingh.com/writing/dpdp-act-2023-health-tech-checklist.html 2026-04-09T00:00:00Z 2026-09-23T00:00:00Z

The DPDP Act 2023 grants patients a Right to Erasure while medical statutes mandate retention. The 10-point engineering checklist covers consent-manager state machines, purpose-limitation schemas, cryptographic scrubbing, fiduciary access controls, and immutable audit logs.