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Valk Guard review

Free#21 of 25 in SQL Linters and Formatters

A focused open-source linter for PostgreSQL safety and schema checks in code.

6.5/10Editor score
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Valk Guard6.5 Visit Valk Guard

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Valk Guard is an open-source command-line SQL linter for developers and engineering teams working with PostgreSQL. It scans raw SQL alongside Go, Goqu, Python SQLAlchemy, and C# EF Core code, then applies PostgreSQL grammar-aware checks. The tool is suited to teams that want query safety and schema validation within local development, CI, and pull-request review workflows rather than a broad multi-dialect formatter.

Its main strength is source-aware analysis across application code and database definitions. Valk Guard can synthesize SQL from supported ORM and query-builder patterns, detect risky queries and destructive DDL, flag unbounded selects, identify unknown schema references, and find drift between ORM models and migration DDL. Nineteen built-in rules cover query safety, schema drift, and schema validation. Findings can be emitted as JSON, SARIF, reviewdog rdjsonl, or terminal output, with GitHub Actions and reviewdog integrations available for CI and pull-request workflows.

Valk Guard keeps its focus narrow. PostgreSQL is the supported SQL dialect, and the published category specifications show no autofix or custom-rule support, so teams seeking automated rewrites or rule authoring should choose a tool with those capabilities. Configuration is managed through .valk-guard.yaml, while supported integrations include Go, Goqu, Python SQLAlchemy, C# EF Core, GitHub Actions, and reviewdog. Choose Valk Guard when PostgreSQL safety checks, schema-drift detection, and code-aware CI feedback are priorities; look elsewhere if broad dialect coverage, autofix, or customizable rules are essential.

Valk Guard pros and cons

  • Where it wins
    • Scans raw SQL, application code, ORM, and query-builder patterns
    • Includes 19 rules for query safety, schema drift, and validation
    • Supports CI, pull requests, JSON, SARIF, and reviewdog output
  • Where it doesn't
    • PostgreSQL is the only supported SQL dialect
    • No autofix for detected issues
    • Custom rules are not supported

Valk Guard fact sheet, pricing and score →

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