Add SQL review standards documentation

Author: adela-bytebase

.bytebase/sql-review.md

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+# .bytebase/sql-review.md
+# SQL Review Standards
+
+## 1. Table Naming Convention
+- All table names must be in snake_case
+- Table names should be plural nouns (e.g., users, orders, products)
+- Avoid abbreviations unless commonly understood
+
+## 2. Column Standards
+- Every table must have a created_at timestamp column
+- Every table must have an updated_at timestamp column
+- Primary key columns should be named 'id'
+
+## 3. Index Requirements
+- Foreign key columns must have indexes
+- Columns used in WHERE clauses frequently should be indexed
+
+## 4. Comment Requirements
+- All tables must have descriptive comments
+- Complex columns should have comments explaining their purpose
+
+## 5. Type Consistency
+- Use TEXT instead of VARCHAR for string columns
+- Use TIMESTAMP for datetime values
+- Use BIGINT for auto-incrementing primary keys