feat: Add SQL linting with reviewdog suggestions

[davideme]

This PR adds SQL linting capabilities with automated code suggestions using reviewdog.

Changes

• Added GitHub Actions workflow for SQL linting with reviewdog
• Added SQLFluff configuration for MySQL and PostgreSQL
• Added SQL linting script for local development
• Updated docker-compose with SQL linting service

Features

• Automatic SQL linting on PRs
• Code suggestions using reviewdog
• Support for both MySQL and PostgreSQL dialects
• Local linting capability via Docker

How to Use

1. In Pull Requests:

   • The workflow automatically runs on SQL file changes
   • Reviewdog will suggest fixes as PR comments

2. Locally:

   ./scripts/lint-sql.sh

Closes #1

[Copilot]

Copilot reviewed 9 out of 14 changed files in this pull request and generated no comments.

Files not reviewed (5)

• .sqlfluff: Language not supported
• database/sql/mysql/schema.sql: Language not supported
• database/sql/postgresql/schema.sql: Language not supported
• scripts/lint-sql.sh: Language not supported
• test-databases.sh: Language not supported

Comments suppressed due to low confidence (2)

database/mongodb/init.js:43

• The usage of UUID() in the insert document may cause runtime errors if UUID() is not defined in your MongoDB environment. Consider using a well-supported UUID generation method or the native ObjectId to ensure consistent behavior.

  _id: UUID().toString(),

.github/workflows/database-tests.yml:47

• [nitpick] The use of double quotes in the --format parameter may lead to shell parsing issues. Consider using single quotes around the format string (e.g., '--format "{{.ExitCode}}"') to avoid potential interpolation problems.

EXIT_CODE=$(docker compose ps -a --format "{{.ExitCode}}" test)

[Copilot]

Copilot reviewed 9 out of 14 changed files in this pull request and generated no comments.

Files not reviewed (5)

• .sqlfluff: Language not supported
• database/sql/mysql/schema.sql: Language not supported
• database/sql/postgresql/schema.sql: Language not supported
• scripts/lint-sql.sh: Language not supported
• test-databases.sh: Language not supported

Comments suppressed due to low confidence (1)

database/mongodb/init.js:43

• Ensure that 'new UUID()' is supported in the MongoDB shell environment; if not, consider using the standard UUID() function or another reliable UUID generation method.

  _id: new UUID().toString(),