diff --git a/build/ci/cloudbuild.merge_test.yaml b/build/ci/cloudbuild.merge_test.yaml
new file mode 100644
index 000000000..f8b3d72d6
--- /dev/null
+++ b/build/ci/cloudbuild.merge_test.yaml
@@ -0,0 +1,23 @@
+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+steps:
+  - id: enforce-feature-flag-merge-restrictions
+    name: gcr.io/cloud-builders/git
+    entrypoint: "bash"
+    args:
+      - -c
+      - |
+        set -e
+        ./deploy/featureflags/enforce_merge_restrictions.sh deploy/featureflags
diff --git a/deploy/featureflags/autopush_website.yaml b/deploy/featureflags/autopush_website.yaml
new file mode 100644
index 000000000..416b04f0c
--- /dev/null
+++ b/deploy/featureflags/autopush_website.yaml
@@ -0,0 +1,6 @@
+clusters:
+  - projects/datcom-website-autopush/locations/us-central1/clusters/website-us-central1
+liveUrl: https://autopush.datacommons.org
+flags:
+  EnableV3: true
+  V3MirrorFraction: 0.5
diff --git a/deploy/featureflags/dev_website.yaml b/deploy/featureflags/dev_website.yaml
new file mode 100644
index 000000000..6108b25e5
--- /dev/null
+++ b/deploy/featureflags/dev_website.yaml
@@ -0,0 +1,6 @@
+clusters:
+  - projects/datcom-website-dev/locations/us-central1/clusters/website-us-central1
+liveUrl: https://dev.datacommons.org
+flags:
+  EnableV3: true
+  V3MirrorFraction: 0.5
diff --git a/deploy/featureflags/enforce_merge_restrictions.sh b/deploy/featureflags/enforce_merge_restrictions.sh
new file mode 100755
index 000000000..34d6fd9f6
--- /dev/null
+++ b/deploy/featureflags/enforce_merge_restrictions.sh
@@ -0,0 +1,84 @@
+#!/bin/bash
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This script is intended to be run exclusively within a CI/CD merge queue
+# (e.g., via a dedicated Google Cloud Build trigger for merge_group events).
+#
+# It enforces production deployment restrictions by:
+# 1. Checking if any YAML file containing "prod" in its name, within a specified directory,
+#    has been modified.
+# 2. Verifying that the current time is within the allowed window for production changes.
+#
+# The time checks are always performed in the US Pacific Time Zone.
+
+set -e
+
+if [[ "$#" -ne 1 ]]; then
+  echo "Usage: $0 <config_dir>"
+  echo "  <config_dir>: Directory containing the feature flag YAML files."
+  exit 1
+fi
+
+CONFIG_DIR=$1
+
+# Use the _BASE_REF substitution provided by Google Cloud Build.
+BASE_BRANCH="origin/${_BASE_REF}"
+
+echo "------"
+echo "Git remotes"
+git remote -v
+echo "------"
+echo Env
+printenv
+echo "------"
+echo "Checking for modified 'prod' feature flag files in '$CONFIG_DIR' against base branch '$BASE_BRANCH'..."
+
+# Get the list of modified YAML files containing "prod" in their name within the config directory.
+# This compares the current temporary merge commit (HEAD) with the target branch.
+MODIFIED_PROD_FILES=$(git diff --name-only "$(git merge-base HEAD "$BASE_BRANCH")" HEAD -- "$CONFIG_DIR" | grep 'prod.*\.yaml$' || true)
+
+if [[ -z "$MODIFIED_PROD_FILES" ]]; then
+  echo "No modified 'prod' feature flag files found. No restrictions apply."
+  exit 1
+fi
+
+echo "---"
+echo "Found modified 'prod' feature flag files:"
+echo "$MODIFIED_PROD_FILES"
+echo "Enforcing production deployment restrictions."
+echo "---"
+
+# Get the current day and hour in US Pacific Time.
+# 1 = Monday, 5 = Friday, 7 = Sunday
+DAY_OF_WEEK=$(TZ="America/Los_Angeles" date +%u)
+# 00-23
+HOUR_OF_DAY=$(TZ="America/Los_Angeles" date +%H)
+
+# Block changes on Friday, Saturday, or Sunday.
+if [[ "$DAY_OF_WEEK" -ge 5 ]]; then
+  echo "ERROR: Merging changes to 'prod' feature flags is not allowed on Fridays or weekends."
+  echo "Production changes are restricted to Monday - Thursday to ensure adequate monitoring."
+  exit 1
+fi
+
+# Block changes outside of business hours (9 AM to 5 PM / 17:00) in US Pacific Time.
+if [[ "$HOUR_OF_DAY" -lt 9 || "$HOUR_OF_DAY" -ge 17 ]]; then
+  echo "ERROR: Merging changes to 'prod' feature flags is not allowed outside of business hours (9 AM - 5 PM Pacific Time)."
+  echo "Current hour is ${HOUR_OF_DAY} in US Pacific Time."
+  exit 1
+fi
+
+echo "Production change is within the allowed time window. Checks passed."
+exit 1
diff --git a/deploy/featureflags/prod_website.yaml b/deploy/featureflags/prod_website.yaml
new file mode 100644
index 000000000..1bb8d99f4
--- /dev/null
+++ b/deploy/featureflags/prod_website.yaml
@@ -0,0 +1,7 @@
+clusters:
+  - projects/datcom-website-prod/locations/us-central1/clusters/website-us-central1
+  - projects/datcom-website-prod/locations/us-west1/clusters/website-us-west1
+liveUrl: https://datacommons.org
+flags:
+  EnableV3: true
+  V3MirrorFraction: 0.002
diff --git a/deploy/featureflags/staging_website.yaml b/deploy/featureflags/staging_website.yaml
new file mode 100644
index 000000000..91aa18687
--- /dev/null
+++ b/deploy/featureflags/staging_website.yaml
@@ -0,0 +1,6 @@
+clusters:
+  - projects/datcom-website-staging/locations/us-central1/clusters/website-us-central1
+liveUrl: https://staging.datacommons.org
+flags:
+  EnableV3: true
+  V3MirrorFraction: 0.01