Tag
#postgres
23 entries across blog, tutorials, videos, podcasts, and code.
- Blog
Why We Run Multiple LLMs (and Make Them Argue)
One model gives you one confident answer. The problem is "confident" and "correct" aren't the same word.
- Tutorial
DB2 → PostgreSQL: A Worked Example
A worked DB2 to PostgreSQL example: FETCH FIRST n ROWS ONLY, SYSIBM.SYSDUMMY1, VALUES quirks, identity columns, and SQL/PL to PL/pgSQL patterns.
- Tutorial
Moving and assessing Oracle application code to Postgres using Swordfish
Drive the Swordfish web UI through a full Oracle to Postgres assessment of the HR demo: read the grade, find the critical PL/SQL findings, turn 336 findings into a plan.
- Blog
Stop Re-Asking the LLM the Same Question
Incremental distillation: hash the inputs, skip unchanged checks, and cut ~64% of LLM calls on an unchanged re-run — with an honest note on what is not gated yet.
- Tutorial
Tutorial 3 — Memory & Cost: Stop Re-Diagnosing (and Re-Paying for) the Same Problems
Add cross-run memory and incremental skipping so the tool stops re-diagnosing the same issues and an unchanged re-run costs a fraction of the first.
- Tutorial
Moving and assessing MySQL application code to Postgres using Swordfish
Drive the Swordfish terminal UI through a full MySQL → Postgres assessment of a real PHP app — find the embedded SQL, read what breaks, export the plan.
- Blog
Heuristics + AI: Why Deterministic Rules Come First
The cheapest, most accurate part of Swordfish doesn't use AI at all. That's not an accident.
- Tutorial
SQL Server → PostgreSQL: A Worked Example
A worked SQL Server to PostgreSQL example: TOP, IDENTITY, GETDATE/ISNULL/LEN, bracket identifiers, MERGE, and READ UNCOMMITTED habits.
- Blog
Teaching an Audit Tool to Remember
Cross-audit lineage and supersession: immutable history, and the what-changed-since-last-time report a returning user actually wants.
- Tutorial
Tutorial 2 — Build an LLM-as-Judge: Catching Hallucinations Before They Ship
Build the LLM-as-judge verification layer: a cheap deterministic grounding check plus a multi-model consensus vote — including the substring-grounding bug in its natural habitat.
- Blog
The Stuff That Isn't in the Code: Inferred Knowledge and Why Migrations Lose It
Your application knows things it never wrote down. The migration is where it forgets.
- Tutorial
MySQL → PostgreSQL: A Worked Example
A worked MySQL to PostgreSQL example: AUTO_INCREMENT, backtick identifiers, ENUM, ON DUPLICATE KEY, GROUP BY ordering, and the dump-to-PG rewrite path.
- Blog
A Tour of the Swordfish Sample Apps (and What Breaks in Each)
The hardest part of evaluating a database migration tool is finding something honest to point it at.
- Tutorial
Your first pgvector query
Install pgvector, embed three documents, and run a similarity search — in about 10 minutes.
- Code
pgvector basics
Create the extension, a table with an embedding column, and an HNSW index.
- Blog
Cheap Checks Before Expensive Ones: The Two-Part Judge Pattern
The two-part judge pattern in ~40 lines: a deterministic filter first, multi-model consensus second. It generalizes to RAG, extraction, and code review.
- Blog
Why agent memory belongs in Postgres
A vector store is an index, not a database. Agent memory needs both — and pgvector is the door.
- Tutorial
Tutorial 1 — Foundations: Structured Output + a Multi-Provider LLM Harness
Replace free-form LLM prose with structured Finding objects over a multi-provider harness — the checkable spine the rest of the build depends on.
- Blog
Swordfish: A Harness for Your Copilot, Not Migration-in-a-Box
We're not trying to replace your LLM. We're trying to make it stop guessing.
- Tutorial
Oracle → PostgreSQL: A Worked Example
A worked Oracle to PostgreSQL example: the constructs Swordfish flags most (CONNECT BY, ROWNUM, NVL, packages), the recommended PG/EPAS change, and the human-review step.
- Blog
I Asked an LLM to Diagnose My Database. Then I Asked Another LLM if It Was Lying.
The origin story of the judge: the model invented a shared_buffers value. The fix was not a bigger model — it was cheap grounding plus a second-opinion jury.
- Tutorial
Tutorial 0 — We Vibe-Coded a Database Doctor. Does It Actually Work?
We vibe-coded a 100-point Postgres health check. Does it actually work? The quickstart, the two engines, and an honest gut-check of where the naive version fails.
- Blog
Why Database Migrations Are a Developer Problem
The schema is the easy part. The code is where migrations go to die.
