from dataclasses import dataclass

@dataclass(frozen=True)
class Trigger:
    connector: str
    tenant_id: str
    mode: str = 'incremental'
    idempotency_key: str = ''
    source: str = 'on_demand'

class TriggerValidator:
    @staticmethod
    def validate(trigger):
        if trigger.mode not in ('full', 'incremental'): raise ValueError('invalid mode')
        if trigger.source not in ('on_demand', 'schedule', 'webhook'): raise ValueError('invalid source')
        if not trigger.tenant_id or not trigger.connector: raise ValueError('tenant and connector required')
        return trigger