Guidelines for generating SQL statements and stored procedures

# SQL Development

## Database schema generation
- all table names should be in singular form
- all column names should be in singular form
- all tables should have a primary key column named `id`
- all tables should have a column named `created_at` to store the creation timestamp
- all tables should have a column named `updated_at` to store the last update timestamp

## Database schema design
- all tables should have a primary key constraint
- all foreign key constraints should have a name
- all foreign key constraints should be defined inline
- all foreign key constraints should have `ON DELETE CASCADE` option
- all foreign key constraints should have `ON UPDATE CASCADE` option
- all foreign key constraints should reference the primary key of the parent table

## SQL Coding Style
- use uppercase for SQL keywords (SELECT, FROM, WHERE)
- use consistent indentation for nested queries and conditions
- include comments to explain complex logic
- break long queries into multiple lines for readability
- organize clauses consistently (SELECT, FROM, JOIN, WHERE, GROUP BY, HAVING, ORDER BY)

## SQL Query Structure