condition check lambda

infrastructure/README.md

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+# Rentall Infrastructure
+
+AWS CDK infrastructure for Rentall Lambda functions.
+
+## Prerequisites
+
+- Node.js 20+
+- AWS CLI configured with appropriate credentials
+- AWS CDK CLI (`npm install -g aws-cdk`)
+
+## Setup
+
+```bash
+cd infrastructure/cdk
+npm install
+```
+
+## Deploy
+
+### Staging
+
+```bash
+npm run deploy:staging
+```
+
+### Production
+
+```bash
+npm run deploy:prod
+```
+
+## Environment Variables
+
+The following environment variables should be set before deployment:
+
+- `DATABASE_URL` - PostgreSQL connection string
+- `CDK_DEFAULT_ACCOUNT` - AWS account ID
+- `CDK_DEFAULT_REGION` - AWS region (defaults to us-east-1)
+
+## Stacks
+
+### ConditionCheckLambdaStack
+
+Creates:
+- Lambda function for condition check reminders
+- EventBridge Scheduler group for per-rental schedules
+- IAM roles for Lambda execution and Scheduler invocation
+- Dead letter queue for failed invocations
+
+## Outputs
+
+After deployment, the following values are exported:
+
+- `ConditionCheckLambdaArn-{env}` - Lambda function ARN
+- `ConditionCheckScheduleGroup-{env}` - Schedule group name
+- `ConditionCheckSchedulerRoleArn-{env}` - Scheduler IAM role ARN
+- `ConditionCheckDLQUrl-{env}` - Dead letter queue URL
+
+## Useful Commands
+
+- `npm run synth` - Synthesize CloudFormation template
+- `npm run diff` - Compare deployed stack with current state
+- `npm run destroy` - Destroy all stacks