Add keploy sandbox CI workflow and fixed-width timestamp marshalling

.github/workflows/keploy-sandbox.yml

@@ -0,0 +1,69 @@
+# Auto-generated by keploy scaffold_pipeline_workflow — edit freely.
+# Replays linked sandbox test suites for orderflowproducer on every pull request.
+
+name: Keploy Sandbox Tests
+on:
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  keploy-sandbox:
+    runs-on: ubuntu-latest
+    # Single source of truth for per-app values. Change any of these
+    # without hunting through the steps below.
+    env:
+      COMPOSE_FILE: docker-compose.yml
+      APP_SERVICE: producer
+      CONTAINER_NAME: orderflow-producer
+      APP_ID: 69f0c0c5b5416c13d84e5c2c
+      APP_PORT: "8080"
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install keploy enterprise
+        run: |
+          curl --silent -O -L https://keploy.io/ent/install.sh
+          sudo bash install.sh
+          keploy --version
+
+      - name: Bring up app dependencies
+        run: |
+          docker compose -f "$COMPOSE_FILE" up -d --wait
+          docker compose -f "$COMPOSE_FILE" stop "$APP_SERVICE"
+          docker compose -f "$COMPOSE_FILE" rm -f "$APP_SERVICE"
+
+      - name: Run keploy sandbox tests
+        env:
+          KEPLOY_API_KEY: ${{ secrets.KEPLOY_API_KEY }}
+        run: |
+          # --create-branch uses find-or-create semantics — first run on
+          # a PR creates the Keploy branch named after the git branch;
+          # subsequent runs (force-pushes, retries) reuse the existing
+          # Keploy branch instead of erroring on the name conflict.
+          # The Keploy branch name is auto-stamped onto the run's
+          # CIMetadata.Branch for dashboard display, so there's no
+          # separate --branch flag any more (dropped to disambiguate
+          # from the new Keploy-branch flags).
+          keploy test sandbox \
+            -c "docker compose -f $COMPOSE_FILE up $APP_SERVICE" \
+            --container-name "$CONTAINER_NAME" \
+            --cloud-app-id "$APP_ID" \
+            --app-url "http://localhost:$APP_PORT" \
+            --create-branch "${{ github.head_ref }}"
+
+      - name: Upload keploy reports
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: keploy-reports
+          path: keploy/reports
+          if-no-files-found: ignore
+
+      - name: Dump compose logs on failure
+        if: failure()
+        run: docker compose -f "$COMPOSE_FILE" logs --tail=200
+
+      - name: Tear down
+        if: always()
+        run: docker compose -f "$COMPOSE_FILE" down -v

producer/models/order.go

@@ -1,6 +1,13 @@
 package models
 
-import "time"
+import (
+	"encoding/json"
+	"time"
+)
+
+// fixedNanoLayout always emits 9 fractional-second digits so the JSON byte
+// width of timestamps is constant across runs.
+const fixedNanoLayout = "2006-01-02T15:04:05.000000000Z"
 
 type Order struct {
 	ID          string    `json:"id"`
@@ -14,6 +21,19 @@ type Order struct {
 	UpdatedAt   time.Time `json:"updated_at"`
 }
 
+func (o Order) MarshalJSON() ([]byte, error) {
+	type alias Order
+	return json.Marshal(&struct {
+		alias
+		CreatedAt string `json:"created_at"`
+		UpdatedAt string `json:"updated_at"`
+	}{
+		alias:     alias(o),
+		CreatedAt: o.CreatedAt.UTC().Format(fixedNanoLayout),
+		UpdatedAt: o.UpdatedAt.UTC().Format(fixedNanoLayout),
+	})
+}
+
 type CreateOrderRequest struct {
 	UserID      string  `json:"user_id"`
 	ProductName string  `json:"product_name"`