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skills/database-conventions/reference/INDEX.md

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+# Database Conventions Reference Index
+
+- **[field-naming.md](field-naming.md)** - Complete naming conventions
+- **[indexing.md](indexing.md)** - Index patterns and strategies
+- **[relationships.md](relationships.md)** - Foreign keys and relations

skills/database-conventions/reference/field-naming.md

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+# Field Naming Conventions
+
+**Boolean:** `is_active`, `has_access`, `can_edit`  
+**Timestamp:** `created_at`, `updated_at`, `deleted_at`  
+**Foreign Key:** `user_id`, `tenant_id`, `organization_id`  
+**Email:** `email_address` (not `email`)  
+**Phone:** `phone_number` (not `phone`)  

skills/database-conventions/reference/indexing.md

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+# Indexing Strategies
+
+**Always index:**
+- tenant_id
+- Foreign keys
+- Unique constraints
+- Frequently queried fields
+
+**Composite indexes:**
+```typescript
+index("users_tenant_email_idx").on(users.tenant_id, users.email_address)
+```

skills/database-conventions/reference/relationships.md

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+# Relationships Guide
+
+**One-to-Many:** User has many Posts
+**Many-to-One:** Post belongs to User  
+**Many-to-Many:** User has many Roles through UserRoles
+
+See examples for complete patterns.