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2dph/skills/postgres/SKILL.md
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feat: DuckDB quantiles in-process (gcc CGO), not Ladybug.
OQ3: internal/duckstats + bin/qa/stats.go. Zig stays Ladybug-only.
mikefarah/yq for small structured slices. Gitea #30.
2026-08-14 11:29:22 +01:00

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---
name: postgres
description: >-
Read Postgres as compact YAML through bin/postgres/query.go (read-only
guard, named profiles). Use when a task needs table contents, column types,
or a SELECT against an ops database.
---
# postgres
`bin/postgres/query.go` wraps vendored `bin/db/psql-yq`. Output is YAML
(cheaper than psql ASCII, easy to slice with mikefarah/yq).
```bash
bin/postgres/query.go --profile onlyoffice -s document_asset # column list
bin/postgres/query.go --profile onlyoffice -t task_result -l 20 # sample rows
bin/postgres/query.go --profile onlyoffice -c 'SELECT ...' # query → YAML
```
Ad-hoc targets without a profile:
```bash
bin/postgres/query.go --container my-pg --db app -c 'SELECT 1'
bin/postgres/query.go --dsn 'postgres://user@host:5432/db' -c 'SELECT 1'
```
## Profiles
Connection details live in `$HOME/.config/brain/db-profiles.yml` (mode 600),
never in a project repo. A profile names either a `container` or a `host`;
passwords are read from a separate `password_env_file` and never appear in argv.
## Rules
- **Read-only.** Any `insert|update|delete|drop|truncate|alter|create|grant|
revoke|vacuum|copy` is rejected with exit 3. Do not work around it.
- **PII.** Client CRM databases: aggregate and count freely; never copy names
or addresses into chat, issues or docs.
- Use `-l` to keep samples small. Twenty rows answer most questions.