fix: fix (reviewed): Webhook retry logic uses incorrect HTTP method on retries

[Muyideen-js]

Summary

Fixed webhook retry logic to preserve the original HTTP method across retries.

Root cause: service.go's Deliver method hardcoded http.MethodPost when constructing the retry request, ignoring the original request method stored on the delivery. This caused POST webhooks to be retried as GET requests.

Changes:

1. Added Method field to domain.WebhookDelivery struct.
2. Added a new migration (20260407000000_webhook_delivery_method) adding a method TEXT NOT NULL DEFAULT 'POST' column to webhook_deliveries.
3. Updated webhook_repo.go (CreateDelivery, GetDelivery, ListDeliveries) to persist and read the method column.
4. Updated dispatcher.go to set Method: http.MethodPost when creating a delivery.
5. Updated service.go's Deliver to use the stored deliv.Method (falling back to POST for legacy rows) instead of hardcoded http.MethodPost.
6. Added regression test TestWebhookService_RetryPreservesHTTPMethod verifying the retry uses the original POST method after a 503 failure.

Changed files

• db/migrations/20260407000000_webhook_delivery_method.down.sql
• db/migrations/20260407000000_webhook_delivery_method.up.sql
• internal/domain/webhook.go
• internal/postgres/webhook_repo.go
• internal/webhook/dispatcher.go
• internal/webhook/service.go
• internal/webhook/service_test.go

Test plan

Run go test ./internal/webhook/... to verify the new regression test and existing webhook tests pass. Run go build ./... to confirm compilation. The regression test spins up a mock webhook server returning 503 on the first attempt and verifies both attempts use the POST method.

This PR was created as a draft by the issue solver bot. It will remain a
draft until repository CI passes.

Closes #132

[drips-wave]

@Muyideen-js Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits