## ADDED Requirements

### Requirement: sms_enabled column
The `tags` table SHALL include an `sms_enabled` boolean column, NOT NULL with default TRUE. The schema SHALL add it idempotently so existing databases migrate cleanly.

#### Scenario: Fresh database
- **WHEN** `db/schema.sql` is applied to an empty database
- **THEN** `tags.sms_enabled` exists, defaulting to TRUE

#### Scenario: Existing database
- **WHEN** `db/schema.sql` is re-applied to a database created before this column existed
- **THEN** the column is added without error and existing rows default to TRUE
