diff --git a/.github/workflows/clean-db.yml b/.github/workflows/clean-db.yml
index 98501c1..9c4b3b0 100644
--- a/.github/workflows/clean-db.yml
+++ b/.github/workflows/clean-db.yml
@@ -28,5 +28,4 @@ jobs:
           echo "$ENV_FILE_CONTENT" > .env
 
       - name: Clean
-        run: make dev_clean_db
-  
\ No newline at end of file
+        run: make ci_install ci_clean_db
diff --git a/Makefile b/Makefile
index 7597309..7a86661 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,8 @@
 IMAGE_NAME=watchtogether.online
-RUN_DEV_PARAMS=--workdir /app -v .:/app -it --rm 
+DEV_RUN_PARAMS=--workdir /app -v .:/app --rm -it
+DEV_INSTALL_COMMAND=npm ci && npm i --no-save @rollup/rollup-linux-arm64-gnu firebase-admin
+CI_RUN_PARAMS=--workdir /app -v .:/app --rm
+CI_INSTALL_COMMAND=npm ci && npm i --no-save firebase-admin
 ENV_FILE=.env
 DOCKER_DEV_IMAGE_NAME=watch-together-dev
 DOCKER_STAGING_IMAGE_NAME=watch-together-staging
@@ -16,18 +19,24 @@ build_prod_bundle_image:
 	docker build $$(./buildargs.sh ${ENV_FILE}) --build-arg NODE_ENV=production -t ${DOCKER_PROD_BUNDLE_IMAGE_NAME} --target bundle .
 
 dev_install: build_dev_image
-	docker run ${RUN_DEV_PARAMS} ${DOCKER_DEV_IMAGE_NAME} sh -c "npm ci && npm i --no-save @rollup/rollup-linux-arm64-gnu"
+	docker run ${DEV_RUN_PARAMS} ${DOCKER_DEV_IMAGE_NAME} sh -c "${DEV_INSTALL_COMMAND}"
 
 dev_serve:
-	docker run ${RUN_DEV_PARAMS} -p 5173:5173 --env-file ${ENV_FILE} ${DOCKER_DEV_IMAGE_NAME} npm run dev -- --host
+	docker run ${DEV_RUN_PARAMS} -p 5173:5173 --env-file ${ENV_FILE} ${DOCKER_DEV_IMAGE_NAME} npm run dev -- --host
 
 dev_enter:
-	docker run ${RUN_DEV_PARAMS} --env-file ${ENV_FILE} ${DOCKER_DEV_IMAGE_NAME} bash
+	docker run ${DEV_RUN_PARAMS} --env-file ${ENV_FILE} ${DOCKER_DEV_IMAGE_NAME} bash
 
-dev_stats: build_dev_image
-	docker run ${RUN_DEV_PARAMS} --env-file ${ENV_FILE} ${DOCKER_DEV_IMAGE_NAME} npm run stats -- --host > stats.tsv
+dev_stats:
+	docker run ${DEV_RUN_PARAMS} --env-file ${ENV_FILE} ${DOCKER_DEV_IMAGE_NAME} npm run stats -- --host > stats.tsv
 
-dev_clean_db: build_dev_image
+dev_clean_db:
+	docker run --workdir /app -v .:/app --rm --env-file ${ENV_FILE} ${DOCKER_DEV_IMAGE_NAME} npm run clean-db -- 2678400 # 31 day
+
+ci_install: build_dev_image
+	docker run ${CI_RUN_PARAMS} ${DOCKER_DEV_IMAGE_NAME} sh -c "${CI_INSTALL_COMMAND}"
+
+ci_clean_db:
 	docker run --workdir /app -v .:/app --rm --env-file ${ENV_FILE} ${DOCKER_DEV_IMAGE_NAME} npm run clean-db -- 2678400 # 31 day
 
 staging_serve: build_staging_image
diff --git a/clean-db.js b/clean-db.js
index 46323a6..a1065e2 100644
--- a/clean-db.js
+++ b/clean-db.js
@@ -21,9 +21,9 @@ const main = async function() {
             if (typeof updatedAt !== 'number') {
                 process.stdout.write(`room#${childSnapshot.key}\twrong type: ${typeof updatedAt}\n`);
             } else if (updatedAt < now - diff) {
-                process.stdout.write(`room#${childSnapshot.key}\tupdated ${Math.round((now - updatedAt) / 60 / 60 / 24)} hours ago\n`);
+                process.stdout.write(`room#${childSnapshot.key}\tupdated ${Math.round((now - updatedAt) / 60 / 60 / 24)} days ago\n`);
             } else if (updatedAt > now + diff) {
-                process.stdout.write(`room#${childSnapshot.key}\tupdated ${Math.round((updatedAt - now) / 60 / 60 / 24)} hours ahead (in future)\n`);
+                process.stdout.write(`room#${childSnapshot.key}\tupdated ${Math.round((updatedAt - now) / 60 / 60 / 24)} days ahead (in future)\n`);
             } else {
                 return;
             }
diff --git a/stats.js b/stats.js
index 2b616be..f3d9977 100644
--- a/stats.js
+++ b/stats.js
@@ -1,5 +1,5 @@
 import admin from 'firebase-admin';
-import { ref, onValue, get } from 'firebase/database';
+import { get } from 'firebase/database';
 import serviceAccount from './service-account-key.json' assert { type: "json" };
 
 admin.initializeApp({