## ADDED Requirements

### Requirement: Paid-order gating
When a tag has a linked order (`order_id` not null) whose status is not `paid`, scans SHALL be recorded but no alert SMS SHALL be sent. Tags without a linked order SHALL still alert (transitional).

#### Scenario: Lapsed order
- **WHEN** a scan arrives on a tag whose order status is `lapsed` or `pending`
- **THEN** the scan is recorded with `alert_sent = false` and no SMS is sent

#### Scenario: Paid order
- **WHEN** a scan arrives on a tag whose order is `paid`
- **THEN** normal alert rules apply

#### Scenario: No order yet
- **WHEN** a scan arrives on a tag with no linked order
- **THEN** normal alert rules apply (transitional behaviour)

### Requirement: Per-tag daily alert cap
A tag SHALL alert at most N times in any 24-hour window (N configurable, default 5). Excess scans are recorded without alerts.

#### Scenario: Cap reached
- **WHEN** a tag has already alerted N times in the last 24 h
- **THEN** further scans are recorded but no SMS is sent

### Requirement: Per-IP hourly rate limit
A scanner IP SHALL trigger at most M alerts per hour (M configurable, default 10). Excess alerts from the same IP are suppressed.

#### Scenario: Rate exceeded
- **WHEN** an IP has triggered M alerts in the last hour
- **THEN** further scan alerts from that IP are suppressed (scans still recorded)
