payments-dashboard/template.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: Payments Dashboard - S3 CSV ingestion to Slack App Home

Parameters:
  DynamoDbCmkArn:
    Type: AWS::SSM::Parameter::Value<String>
    Default: /seahaven/dynamodb/cmk-arn
    Description: >-
      ARN of the shared customer-managed CMK (alias/seahaven-dynamodb) that
      encrypts the PaymentsDashboard table. Functions that read/write the table
      need kms:Decrypt/GenerateDataKey/DescribeKey on this key (the boundary
      permits exactly these), or DynamoDB calls fail with AccessDeniedException.

Globals:
  Function:
    Runtime: nodejs22.x
    Architectures:
      - arm64
    Timeout: 30
    MemorySize: 256
    PermissionsBoundary: arn:aws:iam::328440206208:policy/seahaven-lambda-execution-boundary
    Environment:
      Variables:
        TABLE_NAME: !Ref DashboardTable
  # Access logging + default throttling on the implicit HTTP API (audit M-18).
  HttpApi:
    AccessLogSettings:
      DestinationArn: !GetAtt ApiAccessLogGroup.Arn
      Format: '{"requestId":"$context.requestId","ip":"$context.identity.sourceIp","requestTime":"$context.requestTime","method":"$context.httpMethod","routeKey":"$context.routeKey","status":"$context.status","protocol":"$context.protocol","responseLength":"$context.responseLength","integrationError":"$context.integrationErrorMessage"}'
    DefaultRouteSettings:
      ThrottlingBurstLimit: 50
      ThrottlingRateLimit: 100

Resources:
  ApiAccessLogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      LogGroupName: /aws/apigateway/payments-dashboard
      RetentionInDays: 90

  # VPC with private subnet + NAT Gateway for static outbound IP
  Vpc:
    Type: AWS::EC2::VPC
    Properties:
      CidrBlock: 10.20.0.0/16
      EnableDnsSupport: true
      EnableDnsHostnames: true
      Tags:
        - Key: Name
          Value: payments-dashboard-vpc

  PrivateSubnet:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: 10.20.1.0/24
      AvailabilityZone: !Select [0, !GetAZs ""]
      Tags:
        - Key: Name
          Value: payments-dashboard-private

  PublicSubnet:
    Type: AWS::EC2::Subnet
    Properties:
      VpcId: !Ref Vpc
      CidrBlock: 10.20.2.0/24
      AvailabilityZone: !Select [0, !GetAZs ""]
      Tags:
        - Key: Name
          Value: payments-dashboard-public

  InternetGateway:
    Type: AWS::EC2::InternetGateway

  VpcGatewayAttachment:
    Type: AWS::EC2::VPCGatewayAttachment
    Properties:
      VpcId: !Ref Vpc
      InternetGatewayId: !Ref InternetGateway

  NatEip:
    Type: AWS::EC2::EIP
    Properties:
      Domain: vpc

  NatGateway:
    Type: AWS::EC2::NatGateway
    Properties:
      AllocationId: !GetAtt NatEip.AllocationId
      SubnetId: !Ref PublicSubnet

  PublicRouteTable:
    Type: AWS::EC2::RouteTable
    Properties:
      VpcId: !Ref Vpc

  PublicRoute:
    Type: AWS::EC2::Route
    DependsOn: VpcGatewayAttachment
    Properties:
      RouteTableId: !Ref PublicRouteTable
      DestinationCidrBlock: 0.0.0.0/0
      GatewayId: !Ref InternetGateway

  PublicSubnetRouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref PublicSubnet
      RouteTableId: !Ref PublicRouteTable

  PrivateRouteTable:
    Type: AWS::EC2::RouteTable
    Properties:
      VpcId: !Ref Vpc

  PrivateRoute:
    Type: AWS::EC2::Route
    Properties:
      RouteTableId: !Ref PrivateRouteTable
      DestinationCidrBlock: 0.0.0.0/0
      NatGatewayId: !Ref NatGateway

  # Gateway endpoints (audit M-22): keep S3/DynamoDB traffic off the NAT
  # gateway — free, and removes per-GB NAT data-processing charges.
  S3GatewayEndpoint:
    Type: AWS::EC2::VPCEndpoint
    Properties:
      VpcId: !Ref Vpc
      ServiceName: !Sub com.amazonaws.${AWS::Region}.s3
      VpcEndpointType: Gateway
      RouteTableIds:
        - !Ref PublicRouteTable
        - !Ref PrivateRouteTable

  DynamoDbGatewayEndpoint:
    Type: AWS::EC2::VPCEndpoint
    Properties:
      VpcId: !Ref Vpc
      ServiceName: !Sub com.amazonaws.${AWS::Region}.dynamodb
      VpcEndpointType: Gateway
      RouteTableIds:
        - !Ref PublicRouteTable
        - !Ref PrivateRouteTable

  PrivateSubnetRouteTableAssociation:
    Type: AWS::EC2::SubnetRouteTableAssociation
    Properties:
      SubnetId: !Ref PrivateSubnet
      RouteTableId: !Ref PrivateRouteTable

  LambdaSecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: Payments Dashboard Lambda outbound access
      VpcId: !Ref Vpc
      SecurityGroupEgress:
        - IpProtocol: "-1"
          CidrIp: 0.0.0.0/0

  PaymentsCsvBucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: !Sub seahaven-payments-csv-${AWS::AccountId}
      PublicAccessBlockConfiguration:
        BlockPublicAcls: true
        IgnorePublicAcls: true
        BlockPublicPolicy: true
        RestrictPublicBuckets: true

  DashboardTable:
    Type: AWS::DynamoDB::Table
    Properties:
      TableName: PaymentsDashboard
      BillingMode: PAY_PER_REQUEST
      AttributeDefinitions:
        - AttributeName: pk
          AttributeType: S
      KeySchema:
        - AttributeName: pk
          KeyType: HASH
      TimeToLiveSpecification:
        AttributeName: ttl
        Enabled: true
      # SSE-KMS with the shared CMK (alias/seahaven-dynamodb, INFRA-95 / M-3).
      # The table was migrated to this key out-of-band, so declaring it here
      # reconciles the template drift (no-op against the live table). Consumer
      # roles still need explicit kms perms below (SAM policies do not auto-add).
      SSESpecification:
        SSEEnabled: true
        SSEType: KMS
        KMSMasterKeyId: !Ref DynamoDbCmkArn

  PayrollEmailBucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: !Sub seahaven-payroll-emails-${AWS::AccountId}
      PublicAccessBlockConfiguration:
        BlockPublicAcls: true
        IgnorePublicAcls: true
        BlockPublicPolicy: true
        RestrictPublicBuckets: true
      LifecycleConfiguration:
        Rules:
          - Id: ExpireEmails
            Status: Enabled
            ExpirationInDays: 30

  PayrollEmailBucketPolicy:
    Type: AWS::S3::BucketPolicy
    Properties:
      Bucket: !Ref PayrollEmailBucket
      PolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Sid: AllowSESPut
            Effect: Allow
            Principal:
              Service: ses.amazonaws.com
            Action: s3:PutObject
            Resource: !Sub arn:aws:s3:::seahaven-payroll-emails-${AWS::AccountId}/*
            Condition:
              StringEquals:
                AWS:SourceAccount: !Ref AWS::AccountId

  PayrollEmailRule:
    Type: AWS::SES::ReceiptRule
    DependsOn: PayrollEmailBucketPolicy
    Properties:
      RuleSetName: INBOUND_MAIL
      After: ExistingRuleSetWorkorderEmailRuleEA29F845-okepxcVarTfu
      Rule:
        Name: store-payroll-emails
        Enabled: true
        ScanEnabled: true
        Recipients:
          - payroll@int.seahaven.com
        Actions:
          - S3Action:
              BucketName: !Ref PayrollEmailBucket
              ObjectKeyPrefix: inbound/

  PayrollBatchQueue:
    Type: AWS::SQS::Queue
    Properties:
      QueueName: payments-payroll-batch
      DelaySeconds: 600
      MessageRetentionPeriod: 86400
      VisibilityTimeout: 60
      RedrivePolicy:
        deadLetterTargetArn: !GetAtt PayrollBatchDLQ.Arn
        maxReceiveCount: 3

  # Audit L-15: payroll-batch messages were lost after max receives. 14-day
  # retention so a failure on Friday survives the weekend.
  PayrollBatchDLQ:
    Type: AWS::SQS::Queue
    Properties:
      QueueName: payments-payroll-batch-dlq
      MessageRetentionPeriod: 1209600

  PayrollBatchDLQAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-payroll-batch-dlq-messages
      AlarmDescription: Failed payroll-batch messages landed in the DLQ
      Namespace: AWS/SQS
      MetricName: ApproximateNumberOfMessagesVisible
      Dimensions:
        - Name: QueueName
          Value: !GetAtt PayrollBatchDLQ.QueueName
      Statistic: Maximum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      # ALARM-only notification by convention — no OK/recovery action
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  # Async-invoke OnFailure DLQs (INFRA-41 / H-8). Reconciles the interim
  # CLI-created queues into CloudFormation. Names are CFN-generated to avoid
  # colliding with the live interim payments-<fn>-dlq queues (deleted after
  # this deploy). 14-day retention mirrors the payments-payroll-batch DLQ so a
  # Friday failure survives the weekend.
  # Distinct -async-dlq name (not the live interim payments-<fn>-dlq) so this
  # CFN queue does not collide with the queue being deleted post-deploy.
  ProcessPaymentCsvDLQ:
    Type: AWS::SQS::Queue
    Properties:
      QueueName: payments-processPaymentCsv-async-dlq
      MessageRetentionPeriod: 1209600 # 14d, matches payments-payroll-batch-dlq

  ProcessPayrollEmailDLQ:
    Type: AWS::SQS::Queue
    Properties:
      QueueName: payments-processPayrollEmail-async-dlq
      MessageRetentionPeriod: 1209600 # 14d, matches payments-payroll-batch-dlq

  # ALARM-only Lambda Errors alarms (INFRA-41 / H-8). Threshold > 0 on the
  # Errors Sum, no OK/recovery action by convention.
  ProcessPaymentCsvErrorsAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-processPaymentCsv-errors
      AlarmDescription: payments-processPaymentCsv invocation errors
      Namespace: AWS/Lambda
      MetricName: Errors
      Dimensions:
        - Name: FunctionName
          Value: !Ref ProcessPaymentCsvFunction
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  ProcessPayrollEmailErrorsAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-processPayrollEmail-errors
      AlarmDescription: payments-processPayrollEmail invocation errors
      Namespace: AWS/Lambda
      MetricName: Errors
      Dimensions:
        - Name: FunctionName
          Value: !Ref ProcessPayrollEmailFunction
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  # ── Lambda Errors alarms (Wave 1) ──────────────────────────────────────────
  # Clone of ProcessPaymentCsvErrorsAlarm for the remaining functions. AWS/Lambda
  # Errors, Sum over 5m, threshold > 0, ALARM-only by convention.
  SlackAppHomeErrorsAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-slackAppHome-errors
      AlarmDescription: payments-slackAppHome invocation errors
      Namespace: AWS/Lambda
      MetricName: Errors
      Dimensions:
        - Name: FunctionName
          Value: !Ref SlackAppHomeFunction
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  FetchBoaTransactionsErrorsAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-fetchBoaTransactions-errors
      AlarmDescription: payments-fetchBoaTransactions invocation errors
      Namespace: AWS/Lambda
      MetricName: Errors
      Dimensions:
        - Name: FunctionName
          Value: !Ref FetchBoaTransactionsFunction
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  ExpenseReceiverErrorsAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-expenseReceiver-errors
      AlarmDescription: payments-expenseReceiver invocation errors
      Namespace: AWS/Lambda
      MetricName: Errors
      Dimensions:
        - Name: FunctionName
          Value: !Ref ExpenseReceiverFunction
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  ExpenseProcessorErrorsAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-expenseProcessor-errors
      AlarmDescription: payments-expenseProcessor invocation errors
      Namespace: AWS/Lambda
      MetricName: Errors
      Dimensions:
        - Name: FunctionName
          Value: !Ref ExpenseProcessorFunction
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  # ── Lambda Throttles alarms (Wave 1) ───────────────────────────────────────
  # AWS/Lambda Throttles, Sum over 5m, threshold > 0, ALARM-only. Throttling
  # signals concurrency exhaustion / reserved-concurrency starvation.
  ProcessPaymentCsvThrottlesAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-processPaymentCsv-throttles
      AlarmDescription: payments-processPaymentCsv invocations throttled
      Namespace: AWS/Lambda
      MetricName: Throttles
      Dimensions:
        - Name: FunctionName
          Value: !Ref ProcessPaymentCsvFunction
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  ProcessPayrollEmailThrottlesAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-processPayrollEmail-throttles
      AlarmDescription: payments-processPayrollEmail invocations throttled
      Namespace: AWS/Lambda
      MetricName: Throttles
      Dimensions:
        - Name: FunctionName
          Value: !Ref ProcessPayrollEmailFunction
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  FetchBoaTransactionsThrottlesAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-fetchBoaTransactions-throttles
      AlarmDescription: payments-fetchBoaTransactions invocations throttled
      Namespace: AWS/Lambda
      MetricName: Throttles
      Dimensions:
        - Name: FunctionName
          Value: !Ref FetchBoaTransactionsFunction
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  SlackAppHomeThrottlesAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-slackAppHome-throttles
      AlarmDescription: payments-slackAppHome invocations throttled
      Namespace: AWS/Lambda
      MetricName: Throttles
      Dimensions:
        - Name: FunctionName
          Value: !Ref SlackAppHomeFunction
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  ExpenseReceiverThrottlesAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-expenseReceiver-throttles
      AlarmDescription: payments-expenseReceiver invocations throttled
      Namespace: AWS/Lambda
      MetricName: Throttles
      Dimensions:
        - Name: FunctionName
          Value: !Ref ExpenseReceiverFunction
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  ExpenseProcessorThrottlesAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-expenseProcessor-throttles
      AlarmDescription: payments-expenseProcessor invocations throttled
      Namespace: AWS/Lambda
      MetricName: Throttles
      Dimensions:
        - Name: FunctionName
          Value: !Ref ExpenseProcessorFunction
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  # ── Lambda Duration alarms (Wave 1) ────────────────────────────────────────
  # AWS/Lambda Duration (ms), Statistic Maximum over 5m. Thresholds are ~80% of
  # each function's configured timeout — early warning before timeout-kills.
  ProcessPaymentCsvDurationAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-processPaymentCsv-duration
      AlarmDescription: payments-processPaymentCsv approaching timeout (~80% of 120s)
      Namespace: AWS/Lambda
      MetricName: Duration
      Dimensions:
        - Name: FunctionName
          Value: !Ref ProcessPaymentCsvFunction
      Statistic: Maximum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 96000
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  ProcessPayrollEmailDurationAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-processPayrollEmail-duration
      AlarmDescription: payments-processPayrollEmail approaching timeout (~80% of 60s)
      Namespace: AWS/Lambda
      MetricName: Duration
      Dimensions:
        - Name: FunctionName
          Value: !Ref ProcessPayrollEmailFunction
      Statistic: Maximum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 48000
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  FetchBoaTransactionsDurationAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-fetchBoaTransactions-duration
      AlarmDescription: payments-fetchBoaTransactions approaching timeout (~80% of 60s)
      Namespace: AWS/Lambda
      MetricName: Duration
      Dimensions:
        - Name: FunctionName
          Value: !Ref FetchBoaTransactionsFunction
      Statistic: Maximum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 48000
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  ExpenseProcessorDurationAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-expenseProcessor-duration
      AlarmDescription: payments-expenseProcessor approaching timeout (~80% of 15s)
      Namespace: AWS/Lambda
      MetricName: Duration
      Dimensions:
        - Name: FunctionName
          Value: !Ref ExpenseProcessorFunction
      Statistic: Maximum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 12000
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  ExpenseReceiverDurationAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-expenseReceiver-duration
      AlarmDescription: payments-expenseReceiver approaching timeout (~80% of 5s)
      Namespace: AWS/Lambda
      MetricName: Duration
      Dimensions:
        - Name: FunctionName
          Value: !Ref ExpenseReceiverFunction
      Statistic: Maximum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 4000
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  SlackAppHomeDurationAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-slackAppHome-duration
      AlarmDescription: payments-slackAppHome approaching timeout (~80% of 30s default)
      Namespace: AWS/Lambda
      MetricName: Duration
      Dimensions:
        - Name: FunctionName
          Value: !Ref SlackAppHomeFunction
      Statistic: Maximum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 24000
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  # ── DynamoDB alarms (Wave 1, SCOPE-CONFIRM) ────────────────────────────────
  # AWS/DynamoDB throttle metrics for the PaymentsDashboard table. These metrics
  # emit at the TableName dimension and only on the occurrence of a throttle
  # event — none are currently present in CloudWatch (the table is
  # PAY_PER_REQUEST, so sustained throttling is unlikely but possible during
  # burst-capacity ramp). SystemErrors is intentionally not alarmed: AWS/DynamoDB
  # SystemErrors does not emit at the TableName-only dimension, so it can never
  # fire. Threshold > 0, Sum over 5m, ALARM-only.
  DashboardTableReadThrottleAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-dashboard-table-read-throttle
      AlarmDescription: PaymentsDashboard table read requests throttled
      Namespace: AWS/DynamoDB
      MetricName: ReadThrottleEvents
      Dimensions:
        - Name: TableName
          Value: !Ref DashboardTable
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  DashboardTableWriteThrottleAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-dashboard-table-write-throttle
      AlarmDescription: PaymentsDashboard table write requests throttled
      Namespace: AWS/DynamoDB
      MetricName: WriteThrottleEvents
      Dimensions:
        - Name: TableName
          Value: !Ref DashboardTable
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  # ── API Gateway (HTTP API v2) alarms (Wave 1, SCOPE-CONFIRM) ────────────────
  # AWS/ApiGateway v2 metrics on the implicit ServerlessHttpApi (ApiId dim).
  # v2 metric names are 4xx/5xx/Latency (not 4XXError/5XXError). 5xx and Latency
  # alarm on the API itself; 4xx is mostly client-driven so its threshold is
  # set above zero to avoid noise (Slack URL-verification / bad requests).
  ApiGateway5xxAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-dashboard-api-5xx
      AlarmDescription: payments-dashboard HTTP API returned 5xx responses
      Namespace: AWS/ApiGateway
      MetricName: 5xx
      Dimensions:
        - Name: ApiId
          Value: !Ref ServerlessHttpApi
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  ApiGateway4xxAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-dashboard-api-4xx
      AlarmDescription: payments-dashboard HTTP API elevated 4xx responses
      Namespace: AWS/ApiGateway
      MetricName: 4xx
      Dimensions:
        - Name: ApiId
          Value: !Ref ServerlessHttpApi
      Statistic: Sum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 10
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  ApiGatewayLatencyAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-dashboard-api-latency-p99
      AlarmDescription: payments-dashboard HTTP API p99 latency elevated (>3s)
      Namespace: AWS/ApiGateway
      MetricName: Latency
      Dimensions:
        - Name: ApiId
          Value: !Ref ServerlessHttpApi
      ExtendedStatistic: p99
      Period: 300
      EvaluationPeriods: 1
      Threshold: 3000
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  # Messages-present alarms on the async-invoke OnFailure DLQs, mirroring
  # PayrollBatchDLQAlarm. Threshold > 0 on the visible-message count, ALARM-only.
  ProcessPaymentCsvDLQAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-processPaymentCsv-async-dlq-messages
      AlarmDescription: Failed processPaymentCsv async invocations landed in the DLQ
      Namespace: AWS/SQS
      MetricName: ApproximateNumberOfMessagesVisible
      Dimensions:
        - Name: QueueName
          Value: !GetAtt ProcessPaymentCsvDLQ.QueueName
      Statistic: Maximum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      # ALARM-only notification by convention — no OK/recovery action
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  ProcessPayrollEmailDLQAlarm:
    Type: AWS::CloudWatch::Alarm
    Properties:
      AlarmName: payments-processPayrollEmail-async-dlq-messages
      AlarmDescription: Failed processPayrollEmail async invocations landed in the DLQ
      Namespace: AWS/SQS
      MetricName: ApproximateNumberOfMessagesVisible
      Dimensions:
        - Name: QueueName
          Value: !GetAtt ProcessPayrollEmailDLQ.QueueName
      Statistic: Maximum
      Period: 300
      EvaluationPeriods: 1
      Threshold: 0
      ComparisonOperator: GreaterThanThreshold
      TreatMissingData: notBreaching
      # ALARM-only notification by convention — no OK/recovery action
      AlarmActions:
        - !Sub arn:aws:sns:${AWS::Region}:${AWS::AccountId}:site-alerts

  ProcessPayrollEmailLogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      LogGroupName: /aws/lambda/payments-processPayrollEmail
      RetentionInDays: 60

  ProcessPaymentCsvLogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      LogGroupName: /aws/lambda/payments-processPaymentCsv
      RetentionInDays: 60

  SlackAppHomeLogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      LogGroupName: /aws/lambda/payments-slackAppHome
      RetentionInDays: 60

  FetchBoaTransactionsLogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      LogGroupName: /aws/lambda/payments-fetchBoaTransactions
      RetentionInDays: 60

  ExpenseReceiverLogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      LogGroupName: /aws/lambda/payments-expenseReceiver
      RetentionInDays: 60

  ExpenseProcessorLogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      LogGroupName: /aws/lambda/payments-expenseProcessor
      RetentionInDays: 60

  ProcessPayrollEmailFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: payments-processPayrollEmail
      Handler: src/processPayrollEmail.handler
      Timeout: 60
      EventInvokeConfig:
        MaximumRetryAttempts: 2
        MaximumEventAgeInSeconds: 21600
        DestinationConfig:
          OnFailure:
            Type: SQS
            Destination: !GetAtt ProcessPayrollEmailDLQ.Arn
      Environment:
        Variables:
          SLACK_BOT_TOKEN_SECRET_NAME: payments-dashboard/slack-bot-token
          PAYROLL_CHANNEL_ID: C0AV5RBMYKU
          PAYROLL_BATCH_QUEUE_URL: !Ref PayrollBatchQueue
      Events:
        EmailReceived:
          Type: S3
          Properties:
            Bucket: !Ref PayrollEmailBucket
            Events: s3:ObjectCreated:*
            Filter:
              S3Key:
                Rules:
                  - Name: prefix
                    Value: inbound/
        PayrollBatch:
          Type: SQS
          Properties:
            Queue: !GetAtt PayrollBatchQueue.Arn
            BatchSize: 1
      Policies:
        - S3ReadPolicy:
            BucketName: !Sub seahaven-payroll-emails-${AWS::AccountId}
        - DynamoDBCrudPolicy:
            TableName: !Ref DashboardTable
        - Version: "2012-10-17"
          Statement:
            - Effect: Allow
              Action:
                - kms:Decrypt
                - kms:GenerateDataKey
                - kms:DescribeKey
              Resource: !Ref DynamoDbCmkArn
        - Version: "2012-10-17"
          Statement:
            - Effect: Allow
              Action: secretsmanager:GetSecretValue
              Resource: !Sub arn:aws:secretsmanager:${AWS::Region}:${AWS::AccountId}:secret:payments-dashboard/slack-bot-token-*
        - SQSSendMessagePolicy:
            QueueName: !GetAtt PayrollBatchQueue.QueueName
        - SQSPollerPolicy:
            QueueName: !GetAtt PayrollBatchQueue.QueueName

  ProcessPaymentCsvFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: payments-processPaymentCsv
      Handler: src/processPaymentCsv.handler
      Timeout: 120
      EventInvokeConfig:
        MaximumRetryAttempts: 2
        MaximumEventAgeInSeconds: 21600
        DestinationConfig:
          OnFailure:
            Type: SQS
            Destination: !GetAtt ProcessPaymentCsvDLQ.Arn
      Environment:
        Variables:
          BOA_BASE_URL: https://api.bofa.com
          BOA_CHECK_MGMT_SECRET_NAME: payments-dashboard/boa-check-mgmt
      VpcConfig:
        SubnetIds:
          - !Ref PrivateSubnet
        SecurityGroupIds:
          - !Ref LambdaSecurityGroup
      Events:
        CsvUpload:
          Type: S3
          Properties:
            Bucket: !Ref PaymentsCsvBucket
            Events: s3:ObjectCreated:*
            Filter:
              S3Key:
                Rules:
                  - Name: suffix
                    Value: .csv
      Policies:
        - S3ReadPolicy:
            BucketName: !Sub seahaven-payments-csv-${AWS::AccountId}
        - DynamoDBCrudPolicy:
            TableName: !Ref DashboardTable
        - Version: "2012-10-17"
          Statement:
            - Effect: Allow
              Action:
                - kms:Decrypt
                - kms:GenerateDataKey
                - kms:DescribeKey
              Resource: !Ref DynamoDbCmkArn
        - Version: "2012-10-17"
          Statement:
            - Effect: Allow
              Action: secretsmanager:GetSecretValue
              Resource: !Sub arn:aws:secretsmanager:${AWS::Region}:${AWS::AccountId}:secret:payments-dashboard/boa-check-mgmt-*
        - Version: "2012-10-17"
          Statement:
            - Effect: Allow
              Action:
                - ec2:CreateNetworkInterface
                - ec2:DescribeNetworkInterfaces
                - ec2:DeleteNetworkInterface
              Resource: "*"

  SlackAppHomeFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: payments-slackAppHome
      Handler: src/slackAppHome.handler
      VpcConfig:
        SubnetIds:
          - !Ref PrivateSubnet
        SecurityGroupIds:
          - !Ref LambdaSecurityGroup
      Environment:
        Variables:
          SLACK_BOT_TOKEN_SECRET_NAME: payments-dashboard/slack-bot-token
      Events:
        SlackEvent:
          Type: HttpApi
          Properties:
            Path: /slack/events
            Method: POST
      Policies:
        - DynamoDBReadPolicy:
            TableName: !Ref DashboardTable
        - Version: "2012-10-17"
          Statement:
            - Effect: Allow
              Action:
                - kms:Decrypt
                - kms:DescribeKey
              Resource: !Ref DynamoDbCmkArn
        - Version: "2012-10-17"
          Statement:
            - Effect: Allow
              Action: secretsmanager:GetSecretValue
              Resource: !Sub arn:aws:secretsmanager:${AWS::Region}:${AWS::AccountId}:secret:payments-dashboard/slack-bot-token-*
        - Version: "2012-10-17"
          Statement:
            - Effect: Allow
              Action:
                - ec2:CreateNetworkInterface
                - ec2:DescribeNetworkInterfaces
                - ec2:DeleteNetworkInterface
              Resource: "*"

  FetchBoaTransactionsFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: payments-fetchBoaTransactions
      Handler: src/fetchBoaTransactions.handler
      Timeout: 60
      VpcConfig:
        SubnetIds:
          - !Ref PrivateSubnet
        SecurityGroupIds:
          - !Ref LambdaSecurityGroup
      Environment:
        Variables:
          BOA_BASE_URL: https://api.bofa.com
          BOA_REPORTING_SECRET_NAME: payments-dashboard/boa-reporting
      Events:
        DailySchedule:
          Type: Schedule
          Properties:
            Schedule: cron(0 13 ? * MON-FRI *)
            Description: Fetch BoA previous day transactions at 9am ET (13:00 UTC)
            Enabled: true
      Policies:
        - DynamoDBCrudPolicy:
            TableName: !Ref DashboardTable
        - Version: "2012-10-17"
          Statement:
            - Effect: Allow
              Action:
                - kms:Decrypt
                - kms:GenerateDataKey
                - kms:DescribeKey
              Resource: !Ref DynamoDbCmkArn
        - Version: "2012-10-17"
          Statement:
            - Effect: Allow
              Action: secretsmanager:GetSecretValue
              Resource: !Sub arn:aws:secretsmanager:${AWS::Region}:${AWS::AccountId}:secret:payments-dashboard/boa-reporting-*
        - Version: "2012-10-17"
          Statement:
            - Effect: Allow
              Action:
                - ec2:CreateNetworkInterface
                - ec2:DescribeNetworkInterfaces
                - ec2:DeleteNetworkInterface
              Resource: "*"

  ExpenseProcessorFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: payments-expenseProcessor
      Handler: src/expenseProcessor.handler
      Timeout: 15
      Environment:
        Variables:
          EXPENSE_BOT_TOKEN_SECRET_NAME: payments-dashboard/expense-slack-token
      Policies:
        - Version: "2012-10-17"
          Statement:
            - Effect: Allow
              Action: secretsmanager:GetSecretValue
              Resource: !Sub arn:aws:secretsmanager:${AWS::Region}:${AWS::AccountId}:secret:payments-dashboard/expense-slack-token-*

  ExpenseReceiverFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: payments-expenseReceiver
      Handler: src/expenseReceiver.handler
      Timeout: 5
      Environment:
        Variables:
          EXPENSE_PROCESSOR_FN: !Ref ExpenseProcessorFunction
          EXPENSE_SIGNING_SECRET_NAME: payments-dashboard/expense-slack-signing-secret
      Events:
        ExpenseSlackEvent:
          Type: HttpApi
          Properties:
            Path: /slack/expense-events
            Method: POST
      Policies:
        - Version: "2012-10-17"
          Statement:
            - Effect: Allow
              Action: lambda:InvokeFunction
              Resource: !GetAtt ExpenseProcessorFunction.Arn
            - Effect: Allow
              Action: secretsmanager:GetSecretValue
              Resource: !Sub arn:aws:secretsmanager:${AWS::Region}:${AWS::AccountId}:secret:payments-dashboard/expense-slack-signing-secret-*

Outputs:
  SlackEventUrl:
    Description: URL to set as the Slack app Request URL
    Value: !Sub https://${ServerlessHttpApi}.execute-api.${AWS::Region}.amazonaws.com/slack/events
  CsvBucket:
    Description: S3 bucket for CSV uploads
    Value: !Ref PaymentsCsvBucket
  StaticOutboundIp:
    Description: Static IP for BoA API whitelist
    Value: !Ref NatEip
  PayrollEmailBucket:
    Description: S3 bucket for inbound payroll emails from SES
    Value: !Ref PayrollEmailBucket
  ExpenseSlackEventsUrl:
    Description: URL for Expense Approval Bot Slack Event Subscriptions
    Value: !Sub https://${ServerlessHttpApi}.execute-api.${AWS::Region}.amazonaws.com/slack/expense-events
  ExpenseProcessorFunctionArn:
    Description: Expense Processor Lambda ARN
    Value: !GetAtt ExpenseProcessorFunction.Arn
  ExpenseReceiverFunctionArn:
    Description: Expense Receiver Lambda ARN
    Value: !GetAtt ExpenseReceiverFunction.Arn