CONV-248: Create billing webhook events table

[menvil]

Summary

• Created billing_webhook_events table with provider, provider_event_id (unique), type, payload (JSON), processed_at fields
• Created BillingWebhookEvent model with payload cast to array and processed_at as datetime
• Created BillingWebhookEventFactory for testing
• Tests verify event creation and unique constraint on provider_event_id

Test plan

• composer test passes (448 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Implements CONV-248 by adding persistent storage for billing webhook events. Adds a billing_webhook_events table and BillingWebhookEvent model to dedupe by provider_event_id and track processing.

• New Features

  • New table: provider, provider_event_id (unique), type, payload (JSON), processed_at, timestamps.
  • New BillingWebhookEvent model with casts (payload array, processed_at datetime).
  • Factory and tests to verify create and unique constraint behavior.

• Migration

  • Run php artisan migrate.

^{Written for commit fc35def. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/CONV-248-create-billing-webhook-events-table

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