feat(rds): emit aws.rds EventBridge events on lifecycle ops

[vieiralucas]

Summary

Closes the first gap from the integrations audit: RDS now emits aws.rds events on the default EventBridge bus when DB instances and snapshots transition state, matching the AWS event schema. Rules can match on source/detail-type and route to SQS, SNS, Lambda, or any supported target.

Events emitted:

Operation	EventID
CreateDBInstance	RDS-EVENT-0005
DeleteDBInstance	RDS-EVENT-0003
ModifyDBInstance	RDS-EVENT-0014
RebootDBInstance	RDS-EVENT-0006
StartDBInstance	RDS-EVENT-0088
StopDBInstance	RDS-EVENT-0089
CreateDBInstanceReadReplica	RDS-EVENT-0005
RestoreDBInstanceFromDBSnapshot	RDS-EVENT-0043
CreateDBSnapshot	RDS-EVENT-0042
DeleteDBSnapshot	RDS-EVENT-0041

Test plan

• Unit tests in crates/fakecloud-rds/src/service.rs cover the emit path with a recording EventBridgeDelivery mock
• E2E tests in crates/fakecloud-e2e/tests/rds_eventbridge.rs exercise StartDBInstance / StopDBInstance through real EB rule matching to an SQS target (no docker required, runs on every CI shard)
• cargo clippy --workspace --all-targets -- -D warnings clean
• cargo fmt --check clean
• Existing RDS E2E suite still green

---

Summary by cubic

RDS now emits aws.rds EventBridge events for DB instance and snapshot lifecycle operations, matching the AWS event schema. Rules on the default bus can route to SQS, SNS, Lambda, and other targets; SNS delivery via rules is now wired and tested.

• New Features
  • Emits events for: Create/Delete/Modify/Reboot/Start/Stop DB instance; Create/Delete snapshot; Create read replica; Restore from snapshot (EventIDs: 0005, 0003, 0014, 0006, 0088, 0089, 0042, 0041, 0043).
  • Wired RdsService to a DeliveryBus that forwards to EventBridge and downstream SQS/SNS targets (no-op when not configured); added E2E tests (Start/Stop -> SQS, Start -> SNS) and unit tests with a recording delivery; updated RDS and integration docs.

^{Written for commit 174a8a3. Summary will update on new commits.}

[codecov]

Codecov Report

❌ Patch coverage is 61.38614% with 78 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/fakecloud-rds/src/service.rs	71.00%	49 Missing ⚠️
crates/fakecloud-rds/src/extras.rs	18.18%	18 Missing ⚠️
crates/fakecloud-server/src/main.rs	0.00%	11 Missing ⚠️

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[cubic-dev-ai]

1 issue found across 7 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="crates/fakecloud-server/src/main.rs">

<violation number="1" location="crates/fakecloud-server/src/main.rs:1681">
P2: RDS EventBridge delivery is wired without an SNS sender, so SNS rule targets for `aws.rds` events are never delivered.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}