https://synehq.com/blog/ Practical SQL, data engineering, and governed analytics guides from SyneHQ.en https://synehq.com/blog/audit-csv-data-with-duckdb/https://synehq.com/blog/audit-csv-data-with-duckdb/A runnable DuckDB tutorial for finding duplicate keys, invalid dates, broken amounts, and missing customer IDs before an export becomes a dashboard.DatabaseSun, 27 Sep 2026 18:30:00 GMT https://synehq.com/blog/monthly-cohort-retention-sql/https://synehq.com/blog/monthly-cohort-retention-sql/Build a reproducible SQL retention table with signup cohorts, distinct active users, fixed denominators, and explicit handling of incomplete months.DatabaseSun, 27 Sep 2026 18:30:00 GMT https://synehq.com/blog/prevent-sql-join-fanout/https://synehq.com/blog/prevent-sql-join-fanout/Reproduce a SQL join fanout bug, fix it by aggregating to one row per order, and verify revenue and refund totals with a runnable DuckDB example.DatabaseSun, 27 Sep 2026 18:30:00 GMT https://synehq.com/blog/agents-do-not-query-like-people/https://synehq.com/blog/agents-do-not-query-like-people/Walk through the twelve queries an agent actually runs, then design read vs write policy, caps, and logs for machine volume—not for one careful analyst.AITue, 22 Sep 2026 18:30:00 GMT https://synehq.com/blog/evaluating-analytics-agents-with-jev/https://synehq.com/blog/evaluating-analytics-agents-with-jev/A practical evaluation design that combines SQL fixtures, execution checks, and Jev judgments, with separate measures for accuracy, repeatability, and useful coverage.AIMon, 21 Sep 2026 18:30:00 GMT https://synehq.com/blog/building-an-analytics-agent-harness-with-jev/https://synehq.com/blog/building-an-analytics-agent-harness-with-jev/Use Jev to classify analytics questions and route model work, while keeping metric definitions, database permissions, and human approval in the harness.AISun, 20 Sep 2026 18:30:00 GMT https://synehq.com/blog/routing-analytics-agents-by-token-cost/https://synehq.com/blog/routing-analytics-agents-by-token-cost/A routing rule you can write down: cheap models for one governed query, frontier for multi-step analysis, never for table dumps. Includes token math and a session log template.AITue, 15 Sep 2026 18:30:00 GMT https://synehq.com/blog/dbt-in-syne-connect-analyze-and-govern/https://synehq.com/blog/dbt-in-syne-connect-analyze-and-govern/A walkthrough of the PostgreSQL preview: dbt Cloud and manifest connections, analysis with Kole, isolated compilation, team-managed runners, and reviewed schema changes.ProductThu, 10 Sep 2026 18:30:00 GMT https://synehq.com/blog/gpt-6-astra-tools-not-the-warehouse/https://synehq.com/blog/gpt-6-astra-tools-not-the-warehouse/A million-token window is not a data platform. Learn the shrink-then-reason loop, a worked revenue-variance example, and a checklist for trusting an LLM number.AITue, 08 Sep 2026 18:30:00 GMT https://synehq.com/blog/from-dashboards-to-decisions-modern-analytics-platform/https://synehq.com/blog/from-dashboards-to-decisions-modern-analytics-platform/How teams can carry a question from dashboard signal through governed investigation to a reviewable operational next step.DatabaseTue, 01 Sep 2026 18:30:00 GMT https://synehq.com/blog/how-to-build-a-postgres-dashboard-in-10-minutes-(2026)/https://synehq.com/blog/how-to-build-a-postgres-dashboard-in-10-minutes-(2026)/A practical path from a read-only Postgres connection to an inspected query, a useful chart, and a dashboard your team can review and share.DatabaseMon, 06 Apr 2026 18:30:00 GMT https://synehq.com/blog/the-rise-of-reasoning-agents-in-business-analytics/https://synehq.com/blog/the-rise-of-reasoning-agents-in-business-analytics/A practical guide to analytics agents that plan work, call governed tools, record assumptions, and route consequential recommendations for review.AIWed, 12 Nov 2025 18:30:00 GMT https://synehq.com/blog/how-to-use-ai-to-query-databases-without-writing-sql/https://synehq.com/blog/how-to-use-ai-to-query-databases-without-writing-sql/How natural-language database queries move from a question to schema-aware SQL, where they fail, and how teams can validate and govern the results.AITue, 11 Nov 2025 18:30:00 GMT https://synehq.com/blog/unlock-secure-credential-free-sql-analytics-in-jupyter-with-the-synehq-sql-extension/https://synehq.com/blog/unlock-secure-credential-free-sql-analytics-in-jupyter-with-the-synehq-sql-extension/A practical guide to using the SyneHQ Jupyter SQL extension, including its connection model, query outputs, access boundaries, and operating caveats.DatabaseSun, 05 Oct 2025 18:30:00 GMT https://synehq.com/blog/streamlining-multi-language-authentication-workflows-with-nginx-auth-proxy/https://synehq.com/blog/streamlining-multi-language-authentication-workflows-with-nginx-auth-proxy/How this OpenResty and NGINX auth proxy validates Auth.js JWE session cookies, fails closed, and sets boundaries for mixed-language services.InfrastructureThu, 31 Jul 2025 18:30:00 GMT https://synehq.com/blog/facing-the-token-tide-how-increasing-input-tokens-impacts-llm-performance/https://synehq.com/blog/facing-the-token-tide-how-increasing-input-tokens-impacts-llm-performance/How to evaluate long-context LLM behavior with position-aware retrieval tests, realistic distractors, model-specific measurements, and operational safeguards.AIThu, 24 Jul 2025 18:30:00 GMT https://synehq.com/blog/tracking-schema-changes-in-production-with-postgresql-event-triggers/https://synehq.com/blog/tracking-schema-changes-in-production-with-postgresql-event-triggers/A practical PostgreSQL event-trigger audit pattern for recording DDL context, limiting access, testing behavior, and planning retention.DatabaseThu, 24 Jul 2025 18:30:00 GMT https://synehq.com/blog/what-is-a-data-lake-definition-architecture-and-use-cases/https://synehq.com/blog/what-is-a-data-lake-definition-architecture-and-use-cases/A practical explanation of data lakes, their storage and governance layers, common failure modes, and when a warehouse or federation is a better fit.DataThu, 24 Jul 2025 18:30:00 GMT https://synehq.com/blog/migrating-from-mongodb-to-elasticsearch-with-monstache-achieving-real-time-low-latency-search/https://synehq.com/blog/migrating-from-mongodb-to-elasticsearch-with-monstache-achieving-real-time-low-latency-search/A build note on using Monstache to maintain an Elasticsearch search projection from MongoDB, including sync, recovery, and rollback work.InfrastructureSun, 06 Jul 2025 18:30:00 GMT https://synehq.com/blog/how-we-built-rabbit-a-production-ready-private-tcp-tunnel-for-devs-who-need-control/https://synehq.com/blog/how-we-built-rabbit-a-production-ready-private-tcp-tunnel-for-devs-who-need-control/A build note on Rabbit's token-to-port TCP tunnel model, connection flow, persistence, operations, and the security boundaries operators own.InfrastructureThu, 03 Jul 2025 18:30:00 GMT https://synehq.com/blog/the-complete-guide-to-text-search-postgresql-duckdb-and-beyond/https://synehq.com/blog/the-complete-guide-to-text-search-postgresql-duckdb-and-beyond/A practical comparison of PostgreSQL, pg_search, DuckDB FTS, and external search engines, with workload tradeoffs and selection checklists.DatabaseThu, 03 Jul 2025 18:30:00 GMT https://synehq.com/blog/zero-downtime-schema-migrations-for-self-hosted-postgres-with-pgroll/https://synehq.com/blog/zero-downtime-schema-migrations-for-self-hosted-postgres-with-pgroll/Use pgroll's versioned schemas and expand-contract workflow to stage PostgreSQL changes while checking locks, backfills, clients, and rollback boundaries.DatabaseThu, 03 Jul 2025 18:30:00 GMT